diff --git a/cmdutils.c b/cmdutils.c
index 67bb66e9b5..3480910338 100644
--- a/cmdutils.c
+++ b/cmdutils.c
@@ -254,7 +254,7 @@ static void prepare_app_arguments(int *argc_ptr, char ***argv_ptr)
 
     win32_argv_utf8 = av_mallocz(sizeof(char *) * (win32_argc + 1) + buffsize);
     argstr_flat     = (char *)win32_argv_utf8 + sizeof(char *) * (win32_argc + 1);
-    if (win32_argv_utf8 == NULL) {
+    if (!win32_argv_utf8) {
         LocalFree(argv_w);
         return;
     }
@@ -1242,7 +1242,7 @@ static int show_formats_devices(void *optctx, const char *opt, const char *arg,
             is_dev = is_device(ofmt->priv_class);
             if (!is_dev && device_only)
                 continue;
-            if ((name == NULL || strcmp(ofmt->name, name) < 0) &&
+            if ((!name || strcmp(ofmt->name, name) < 0) &&
                 strcmp(ofmt->name, last_name) > 0) {
                 name      = ofmt->name;
                 long_name = ofmt->long_name;
@@ -1253,7 +1253,7 @@ static int show_formats_devices(void *optctx, const char *opt, const char *arg,
             is_dev = is_device(ifmt->priv_class);
             if (!is_dev && device_only)
                 continue;
-            if ((name == NULL || strcmp(ifmt->name, name) < 0) &&
+            if ((!name || strcmp(ifmt->name, name) < 0) &&
                 strcmp(ifmt->name, last_name) > 0) {
                 name      = ifmt->name;
                 long_name = ifmt->long_name;
@@ -1262,7 +1262,7 @@ static int show_formats_devices(void *optctx, const char *opt, const char *arg,
             if (name && strcmp(ifmt->name, name) == 0)
                 decode = 1;
         }
-        if (name == NULL)
+        if (!name)
             break;
         last_name = name;
 
diff --git a/compat/avisynth/avisynth_c.h b/compat/avisynth/avisynth_c.h
index 448493b839..2d3002a41c 100644
--- a/compat/avisynth/avisynth_c.h
+++ b/compat/avisynth/avisynth_c.h
@@ -805,7 +805,7 @@ struct AVS_Library {
 
 AVSC_INLINE AVS_Library * avs_load_library() {
   AVS_Library *library = (AVS_Library *)malloc(sizeof(AVS_Library));
-  if (library == NULL)
+  if (!library)
     return NULL;
   library->handle = LoadLibrary("avisynth");
   if (library->handle == NULL)
@@ -870,7 +870,7 @@ fail:
 }
 
 AVSC_INLINE void avs_free_library(AVS_Library *library) {
-  if (library == NULL)
+  if (!library)
     return;
   FreeLibrary(library->handle);
   free(library);
diff --git a/compat/getopt.c b/compat/getopt.c
index 9a9c5421de..41a641f7c8 100644
--- a/compat/getopt.c
+++ b/compat/getopt.c
@@ -54,7 +54,7 @@ static int getopt(int argc, char *argv[], char *opts)
         }
     }
     optopt = c = argv[optind][sp];
-    if (c == ':' || (cp = strchr(opts, c)) == NULL) {
+    if (c == ':' || !(cp = strchr(opts, c))) {
         fprintf(stderr, ": illegal option -- %c\n", c);
         if (argv[optind][++sp] == '\0') {
             optind++;
diff --git a/ffmpeg.c b/ffmpeg.c
index 7999f7277f..2582fbf501 100644
--- a/ffmpeg.c
+++ b/ffmpeg.c
@@ -2083,7 +2083,7 @@ static int process_input_packet(InputStream *ist, const AVPacket *pkt)
     if (ist->next_pts == AV_NOPTS_VALUE)
         ist->next_pts = ist->pts;
 
-    if (pkt == NULL) {
+    if (!pkt) {
         /* EOF handling */
         av_init_packet(&avpkt);
         avpkt.data = NULL;
diff --git a/ffplay.c b/ffplay.c
index e1e4ccc734..6a1660765c 100644
--- a/ffplay.c
+++ b/ffplay.c
@@ -1652,7 +1652,7 @@ static int queue_picture(VideoState *is, AVFrame *src_frame, double pts, double
         is->img_convert_ctx = sws_getCachedContext(is->img_convert_ctx,
             vp->width, vp->height, src_frame->format, vp->width, vp->height,
             AV_PIX_FMT_YUV420P, sws_flags, NULL, NULL, NULL);
-        if (is->img_convert_ctx == NULL) {
+        if (!is->img_convert_ctx) {
             av_log(NULL, AV_LOG_FATAL, "Cannot initialize the conversion context\n");
             exit(1);
         }
diff --git a/ffserver.c b/ffserver.c
index 956d9f5172..e2e0f68757 100644
--- a/ffserver.c
+++ b/ffserver.c
@@ -1600,7 +1600,7 @@ static int http_parse_request(HTTPContext *c)
             break;
         stream = stream->next;
     }
-    if (stream == NULL) {
+    if (!stream) {
         snprintf(msg, sizeof(msg), "File '%s' not found", url);
         http_log("File '%s' not found\n", url);
         goto send_error;
@@ -2980,7 +2980,7 @@ static int prepare_sdp_description(FFStream *stream, uint8_t **pbuffer,
     *pbuffer = NULL;
 
     avc =  avformat_alloc_context();
-    if (avc == NULL || !rtp_format) {
+    if (!avc || !rtp_format) {
         return -1;
     }
     avc->oformat = rtp_format;
diff --git a/libavcodec/atrac3.c b/libavcodec/atrac3.c
index 435f1ac99e..d1dfa6b0ed 100644
--- a/libavcodec/atrac3.c
+++ b/libavcodec/atrac3.c
@@ -888,7 +888,7 @@ static av_cold int atrac3_decode_init(AVCodecContext *avctx)
 
     q->decoded_bytes_buffer = av_mallocz(FFALIGN(avctx->block_align, 4) +
                                          FF_INPUT_BUFFER_PADDING_SIZE);
-    if (q->decoded_bytes_buffer == NULL)
+    if (!q->decoded_bytes_buffer)
         return AVERROR(ENOMEM);
 
     avctx->sample_fmt = AV_SAMPLE_FMT_FLTP;
diff --git a/libavcodec/cook.c b/libavcodec/cook.c
index 5860288e04..eb2654e0d5 100644
--- a/libavcodec/cook.c
+++ b/libavcodec/cook.c
@@ -1239,7 +1239,7 @@ static av_cold int cook_decode_init(AVCodecContext *avctx)
         av_mallocz(avctx->block_align
                    + DECODE_BYTES_PAD1(avctx->block_align)
                    + FF_INPUT_BUFFER_PADDING_SIZE);
-    if (q->decoded_bytes_buffer == NULL)
+    if (!q->decoded_bytes_buffer)
         return AVERROR(ENOMEM);
 
     /* Initialize transform. */
diff --git a/libavcodec/dvbsub.c b/libavcodec/dvbsub.c
index f6b46e64a9..dd84a07664 100644
--- a/libavcodec/dvbsub.c
+++ b/libavcodec/dvbsub.c
@@ -258,7 +258,7 @@ static int encode_dvb_subtitles(DVBSubtitleContext *s,
 
     page_id = 1;
 
-    if (h->num_rects && h->rects == NULL)
+    if (h->num_rects && !h->rects)
         return -1;
 
     /* page composition segment */
diff --git a/libavcodec/dvdsubdec.c b/libavcodec/dvdsubdec.c
index 2b363d02d9..e198a6c9a0 100644
--- a/libavcodec/dvdsubdec.c
+++ b/libavcodec/dvdsubdec.c
@@ -195,7 +195,7 @@ static void reset_rects(AVSubtitle *sub_header)
 {
     int i;
 
-    if (sub_header->rects != NULL) {
+    if (sub_header->rects) {
         for (i = 0; i < sub_header->num_rects; i++) {
             av_freep(&sub_header->rects[i]->pict.data[0]);
             av_freep(&sub_header->rects[i]->pict.data[1]);
@@ -414,7 +414,7 @@ static int find_smallest_bounding_rectangle(AVSubtitle *s)
     int y1, y2, x1, x2, y, w, h, i;
     uint8_t *bitmap;
 
-    if (s->num_rects == 0 || s->rects == NULL || s->rects[0]->w <= 0 || s->rects[0]->h <= 0)
+    if (s->num_rects == 0 || !s->rects || s->rects[0]->w <= 0 || s->rects[0]->h <= 0)
         return 0;
 
     for(i = 0; i < s->rects[0]->nb_colors; i++) {
diff --git a/libavcodec/dvdsubenc.c b/libavcodec/dvdsubenc.c
index ced09dd5e3..425f0af9ee 100644
--- a/libavcodec/dvdsubenc.c
+++ b/libavcodec/dvdsubenc.c
@@ -264,7 +264,7 @@ static int encode_dvd_subtitles(AVCodecContext *avctx,
     int x2, y2;
     int forced = 0;
 
-    if (rects == 0 || h->rects == NULL)
+    if (rects == 0 || !h->rects)
         return AVERROR(EINVAL);
     for (i = 0; i < rects; i++)
         if (h->rects[i]->type != SUBTITLE_BITMAP) {
diff --git a/libavcodec/h263dec.c b/libavcodec/h263dec.c
index 0e1161453b..ff6f0436e3 100644
--- a/libavcodec/h263dec.c
+++ b/libavcodec/h263dec.c
@@ -502,7 +502,7 @@ retry:
         if ((ret = ff_mpv_common_init(s)) < 0)
             return ret;
 
-    if (s->current_picture_ptr == NULL || s->current_picture_ptr->f->data[0]) {
+    if (!s->current_picture_ptr || s->current_picture_ptr->f->data[0]) {
         int i = ff_find_unused_picture(s, 0);
         if (i < 0)
             return i;
@@ -546,7 +546,7 @@ retry:
     s->current_picture.f->key_frame = s->pict_type == AV_PICTURE_TYPE_I;
 
     /* skip B-frames if we don't have reference frames */
-    if (s->last_picture_ptr == NULL &&
+    if (!s->last_picture_ptr &&
         (s->pict_type == AV_PICTURE_TYPE_B || s->droppable))
         return get_consumed_bytes(s, buf_size);
     if ((avctx->skip_frame >= AVDISCARD_NONREF &&
diff --git a/libavcodec/h264.c b/libavcodec/h264.c
index 76161e9730..389307b569 100644
--- a/libavcodec/h264.c
+++ b/libavcodec/h264.c
@@ -299,7 +299,7 @@ const uint8_t *ff_h264_decode_nal(H264Context *h, const uint8_t *src,
     av_fast_padded_malloc(&h->rbsp_buffer[bufidx], &h->rbsp_buffer_size[bufidx], length+MAX_MBPAIR_SIZE);
     dst = h->rbsp_buffer[bufidx];
 
-    if (dst == NULL)
+    if (!dst)
         return NULL;
 
     if(i>=length-1){ //no escaped 0
@@ -1417,7 +1417,7 @@ static int get_last_needed_nal(H264Context *h, const uint8_t *buf, int buf_size)
         ptr = ff_h264_decode_nal(h, buf + buf_index, &dst_length, &consumed,
                                  next_avc - buf_index);
 
-        if (ptr == NULL || dst_length < 0)
+        if (!ptr || dst_length < 0)
             return AVERROR_INVALIDDATA;
 
         buf_index += consumed;
@@ -1516,7 +1516,7 @@ static int decode_nal_units(H264Context *h, const uint8_t *buf, int buf_size,
 
             ptr = ff_h264_decode_nal(hx, buf + buf_index, &dst_length,
                                      &consumed, next_avc - buf_index);
-            if (ptr == NULL || dst_length < 0) {
+            if (!ptr || dst_length < 0) {
                 ret = -1;
                 goto end;
             }
diff --git a/libavcodec/h264_parser.c b/libavcodec/h264_parser.c
index 1d4c2cfaee..36cf980c8e 100644
--- a/libavcodec/h264_parser.c
+++ b/libavcodec/h264_parser.c
@@ -262,7 +262,7 @@ static inline int parse_nal_units(AVCodecParserContext *s,
             break;
         }
         ptr = ff_h264_decode_nal(h, buf, &dst_length, &consumed, src_length);
-        if (ptr == NULL || dst_length < 0)
+        if (!ptr || dst_length < 0)
             break;
 
         init_get_bits(&h->gb, ptr, 8 * dst_length);
diff --git a/libavcodec/h264_ps.c b/libavcodec/h264_ps.c
index 9707332892..20136704d4 100644
--- a/libavcodec/h264_ps.c
+++ b/libavcodec/h264_ps.c
@@ -619,7 +619,7 @@ int ff_h264_decode_picture_parameter_set(H264Context *h, int bit_length)
         return AVERROR(ENOMEM);
     pps->sps_id = get_ue_golomb_31(&h->gb);
     if ((unsigned)pps->sps_id >= MAX_SPS_COUNT ||
-        h->sps_buffers[pps->sps_id] == NULL) {
+        !h->sps_buffers[pps->sps_id]) {
         av_log(h->avctx, AV_LOG_ERROR, "sps_id %u out of range\n", pps->sps_id);
         goto fail;
     }
diff --git a/libavcodec/h264_refs.c b/libavcodec/h264_refs.c
index de1f60a41f..0c7a7894fd 100644
--- a/libavcodec/h264_refs.c
+++ b/libavcodec/h264_refs.c
@@ -811,7 +811,7 @@ int ff_h264_decode_ref_pic_marking(H264Context *h, GetBitContext *gb,
                             (h->max_pic_num - 1);
 #if 0
                     if (mmco[i].short_pic_num >= h->short_ref_count ||
-                        h->short_ref[ mmco[i].short_pic_num ] == NULL){
+                        !h->short_ref[ mmco[i].short_pic_num ]) {
                         av_log(s->avctx, AV_LOG_ERROR,
                                "illegal short ref in memory management control "
                                "operation %d\n", mmco);
diff --git a/libavcodec/huffyuvdec.c b/libavcodec/huffyuvdec.c
index 06e99bc6d9..e4e5ea04bc 100644
--- a/libavcodec/huffyuvdec.c
+++ b/libavcodec/huffyuvdec.c
@@ -800,7 +800,7 @@ static void draw_slice(HYuvContext *s, AVFrame *frame, int y)
     int h, cy, i;
     int offset[AV_NUM_DATA_POINTERS];
 
-    if (s->avctx->draw_horiz_band == NULL)
+    if (!s->avctx->draw_horiz_band)
         return;
 
     h  = y - s->last_slice_end;
diff --git a/libavcodec/interplayvideo.c b/libavcodec/interplayvideo.c
index 542fefe146..0f6c4e2339 100644
--- a/libavcodec/interplayvideo.c
+++ b/libavcodec/interplayvideo.c
@@ -79,7 +79,7 @@ static int copy_from(IpvideoContext *s, AVFrame *src, AVFrame *dst, int delta_x,
             motion_offset, s->upper_motion_limit_offset);
         return AVERROR_INVALIDDATA;
     }
-    if (src->data[0] == NULL) {
+    if (!src->data[0]) {
         av_log(s->avctx, AV_LOG_ERROR, "Invalid decode type, corrupted header?\n");
         return AVERROR(EINVAL);
     }
diff --git a/libavcodec/lcldec.c b/libavcodec/lcldec.c
index 60069d49c5..491a0e9d02 100644
--- a/libavcodec/lcldec.c
+++ b/libavcodec/lcldec.c
@@ -593,7 +593,7 @@ static av_cold int decode_init(AVCodecContext *avctx)
 
     /* Allocate decompression buffer */
     if (c->decomp_size) {
-        if ((c->decomp_buf = av_malloc(max_decomp_size)) == NULL) {
+        if (!(c->decomp_buf = av_malloc(max_decomp_size))) {
             av_log(avctx, AV_LOG_ERROR, "Can't allocate decompression buffer.\n");
             return AVERROR(ENOMEM);
         }
diff --git a/libavcodec/libmp3lame.c b/libavcodec/libmp3lame.c
index fed82e271e..1ac79a2ed9 100644
--- a/libavcodec/libmp3lame.c
+++ b/libavcodec/libmp3lame.c
@@ -94,7 +94,7 @@ static av_cold int mp3lame_encode_init(AVCodecContext *avctx)
     s->avctx = avctx;
 
     /* initialize LAME and get defaults */
-    if ((s->gfp = lame_init()) == NULL)
+    if (!(s->gfp = lame_init()))
         return AVERROR(ENOMEM);
 
 
diff --git a/libavcodec/libopusenc.c b/libavcodec/libopusenc.c
index 8ceb877f38..75e82dac0d 100644
--- a/libavcodec/libopusenc.c
+++ b/libavcodec/libopusenc.c
@@ -366,7 +366,7 @@ static int libopus_encode(AVCodecContext *avctx, AVPacket *avpkt,
         uint8_t* side_data = av_packet_new_side_data(avpkt,
                                                      AV_PKT_DATA_SKIP_SAMPLES,
                                                      10);
-        if(side_data == NULL) {
+        if(!side_data) {
             av_free_packet(avpkt);
             av_free(avpkt);
             return AVERROR(ENOMEM);
diff --git a/libavcodec/libstagefright.cpp b/libavcodec/libstagefright.cpp
index 346cc9ce60..44d7ea1492 100644
--- a/libavcodec/libstagefright.cpp
+++ b/libavcodec/libstagefright.cpp
@@ -280,7 +280,7 @@ static av_cold int Stagefright_init(AVCodecContext *avctx)
     memcpy(s->orig_extradata, avctx->extradata, avctx->extradata_size);
 
     meta = new MetaData;
-    if (meta == NULL) {
+    if (!meta) {
         ret = AVERROR(ENOMEM);
         goto fail;
     }
diff --git a/libavcodec/libutvideoenc.cpp b/libavcodec/libutvideoenc.cpp
index f0d56194b4..3298e64350 100644
--- a/libavcodec/libutvideoenc.cpp
+++ b/libavcodec/libutvideoenc.cpp
@@ -85,7 +85,7 @@ static av_cold int utvideo_encode_init(AVCodecContext *avctx)
     /* Alloc extradata buffer */
     info = (UtVideoExtra *)av_malloc(sizeof(*info));
 
-    if (info == NULL) {
+    if (!info) {
         av_log(avctx, AV_LOG_ERROR, "Could not allocate extradata buffer.\n");
         return AVERROR(ENOMEM);
     }
diff --git a/libavcodec/libvpxenc.c b/libavcodec/libvpxenc.c
index 3dddffd88e..f8a65fbb66 100644
--- a/libavcodec/libvpxenc.c
+++ b/libavcodec/libvpxenc.c
@@ -542,7 +542,7 @@ static int storeframe(AVCodecContext *avctx, struct FrameListData *cx_frame,
             side_data = av_packet_new_side_data(pkt,
                                                 AV_PKT_DATA_MATROSKA_BLOCKADDITIONAL,
                                                 cx_frame->sz_alpha + 8);
-            if(side_data == NULL) {
+            if(!side_data) {
                 av_free_packet(pkt);
                 av_free(pkt);
                 return AVERROR(ENOMEM);
diff --git a/libavcodec/libxvid.c b/libavcodec/libxvid.c
index b521e010e3..a97d53c60a 100644
--- a/libavcodec/libxvid.c
+++ b/libavcodec/libxvid.c
@@ -110,7 +110,7 @@ static int xvid_ff_2pass_create(xvid_plg_create_t * param,
     char *log = x->context->twopassbuffer;
 
     /* Do a quick bounds check */
-    if( log == NULL )
+    if (!log)
         return XVID_ERR_FAIL;
 
     /* We use snprintf() */
@@ -201,7 +201,7 @@ static int xvid_ff_2pass_after(struct xvid_context *ref,
     char frame_type;
 
     /* Quick bounds check */
-    if( log == NULL )
+    if (!log)
         return XVID_ERR_FAIL;
 
     /* Convert the type given to us into a character */
@@ -285,7 +285,7 @@ static int xvid_strip_vol_header(AVCodecContext *avctx,
 
     if( vo_len > 0 ) {
         /* We need to store the header, so extract it */
-        if( avctx->extradata == NULL ) {
+        if (!avctx->extradata) {
             avctx->extradata = av_malloc(vo_len);
             memcpy(avctx->extradata, pkt->data, vo_len);
             avctx->extradata_size = vo_len;
@@ -483,7 +483,7 @@ static av_cold int xvid_encode_init(AVCodecContext *avctx)  {
         rc2pass1.context = x;
         x->twopassbuffer = av_malloc(BUFFER_SIZE);
         x->old_twopassbuffer = av_malloc(BUFFER_SIZE);
-        if( x->twopassbuffer == NULL || x->old_twopassbuffer == NULL ) {
+        if (!x->twopassbuffer || !x->old_twopassbuffer) {
             av_log(avctx, AV_LOG_ERROR,
                 "Xvid: Cannot allocate 2-pass log buffers\n");
             goto fail;
@@ -505,7 +505,7 @@ static av_cold int xvid_encode_init(AVCodecContext *avctx)  {
         }
         x->twopassfd = fd;
 
-        if( avctx->stats_in == NULL ) {
+        if (!avctx->stats_in) {
             av_log(avctx, AV_LOG_ERROR,
                 "Xvid: No 2-pass information loaded for second pass\n");
             goto fail;
diff --git a/libavcodec/motion_est.c b/libavcodec/motion_est.c
index 0eeb2aa176..81ee2bd6b3 100644
--- a/libavcodec/motion_est.c
+++ b/libavcodec/motion_est.c
@@ -1753,7 +1753,7 @@ void ff_fix_long_mvs(MpegEncContext * s, uint8_t *field_select_table, int field_
         int xy= y*s->mb_stride;
         for(x=0; x<s->mb_width; x++){
             if (s->mb_type[xy] & type){    // RAL: "type" test added...
-                if(field_select_table==NULL || field_select_table[xy] == field_select){
+                if (!field_select_table || field_select_table[xy] == field_select) {
                     if(   mv_table[xy][0] >=h_range || mv_table[xy][0] <-h_range
                        || mv_table[xy][1] >=v_range || mv_table[xy][1] <-v_range){
 
diff --git a/libavcodec/mpeg12dec.c b/libavcodec/mpeg12dec.c
index 49a6ab3b41..b9c435dcb8 100644
--- a/libavcodec/mpeg12dec.c
+++ b/libavcodec/mpeg12dec.c
@@ -2597,7 +2597,7 @@ static int decode_chunks(AVCodecContext *avctx, AVFrame *picture,
                     return -1;
                 }
 
-                if (s2->last_picture_ptr == NULL) {
+                if (!s2->last_picture_ptr) {
                     /* Skip B-frames if we do not have reference frames and
                      * GOP is not closed. */
                     if (s2->pict_type == AV_PICTURE_TYPE_B) {
@@ -2609,7 +2609,7 @@ static int decode_chunks(AVCodecContext *avctx, AVFrame *picture,
                 }
                 if (s2->pict_type == AV_PICTURE_TYPE_I || (s2->flags2 & CODEC_FLAG2_SHOW_ALL))
                     s->sync = 1;
-                if (s2->next_picture_ptr == NULL) {
+                if (!s2->next_picture_ptr) {
                     /* Skip P-frames if we do not have a reference frame or
                      * we have an invalid header. */
                     if (s2->pict_type == AV_PICTURE_TYPE_P && !s->sync) {
diff --git a/libavcodec/mpegaudiodec_template.c b/libavcodec/mpegaudiodec_template.c
index 05237070ea..e2523b49ca 100644
--- a/libavcodec/mpegaudiodec_template.c
+++ b/libavcodec/mpegaudiodec_template.c
@@ -1831,7 +1831,7 @@ static av_cold int decode_init_mp3on4(AVCodecContext * avctx)
     MPEG4AudioConfig cfg;
     int i;
 
-    if ((avctx->extradata_size < 2) || (avctx->extradata == NULL)) {
+    if ((avctx->extradata_size < 2) || !avctx->extradata) {
         av_log(avctx, AV_LOG_ERROR, "Codec extradata missing or too short.\n");
         return AVERROR_INVALIDDATA;
     }
diff --git a/libavcodec/mpegvideo.c b/libavcodec/mpegvideo.c
index 119aae2e82..ed4ca3561d 100644
--- a/libavcodec/mpegvideo.c
+++ b/libavcodec/mpegvideo.c
@@ -870,7 +870,7 @@ fail:
 
 static void free_duplicate_context(MpegEncContext *s)
 {
-    if (s == NULL)
+    if (!s)
         return;
 
     av_freep(&s->edge_emu_buffer);
@@ -1671,7 +1671,7 @@ static inline int pic_is_unused(MpegEncContext *s, Picture *pic)
 {
     if (pic == s->last_picture_ptr)
         return 0;
-    if (pic->f->buf[0] == NULL)
+    if (!pic->f->buf[0])
         return 1;
     if (pic->needs_realloc && !(pic->reference & DELAYED_PIC_REF))
         return 1;
@@ -1684,7 +1684,7 @@ static int find_unused_picture(MpegEncContext *s, int shared)
 
     if (shared) {
         for (i = 0; i < MAX_PICTURE_COUNT; i++) {
-            if (s->picture[i].f->buf[0] == NULL && &s->picture[i] != s->last_picture_ptr)
+            if (!s->picture[i].f->buf[0] && &s->picture[i] != s->last_picture_ptr)
                 return i;
         }
     } else {
@@ -1780,8 +1780,7 @@ int ff_mpv_frame_start(MpegEncContext *s, AVCodecContext *avctx)
 
     release_unused_pictures(s);
 
-    if (s->current_picture_ptr &&
-        s->current_picture_ptr->f->buf[0] == NULL) {
+    if (s->current_picture_ptr && !s->current_picture_ptr->f->buf[0]) {
         // we already have a unused image
         // (maybe it was set before reading the header)
         pic = s->current_picture_ptr;
@@ -1839,8 +1838,7 @@ int ff_mpv_frame_start(MpegEncContext *s, AVCodecContext *avctx)
             s->current_picture_ptr ? s->current_picture_ptr->f->data[0] : NULL,
             s->pict_type, s->droppable);
 
-    if ((s->last_picture_ptr == NULL ||
-         s->last_picture_ptr->f->buf[0] == NULL) &&
+    if ((!s->last_picture_ptr || !s->last_picture_ptr->f->buf[0]) &&
         (s->pict_type != AV_PICTURE_TYPE_I ||
          s->picture_structure != PICT_FRAME)) {
         int h_chroma_shift, v_chroma_shift;
@@ -1893,8 +1891,7 @@ int ff_mpv_frame_start(MpegEncContext *s, AVCodecContext *avctx)
         ff_thread_report_progress(&s->last_picture_ptr->tf, INT_MAX, 0);
         ff_thread_report_progress(&s->last_picture_ptr->tf, INT_MAX, 1);
     }
-    if ((s->next_picture_ptr == NULL ||
-         s->next_picture_ptr->f->buf[0] == NULL) &&
+    if ((!s->next_picture_ptr || !s->next_picture_ptr->f->buf[0]) &&
         s->pict_type == AV_PICTURE_TYPE_B) {
         /* Allocate a dummy frame */
         i = ff_find_unused_picture(s, 0);
@@ -3240,7 +3237,7 @@ void ff_mpeg_flush(AVCodecContext *avctx){
     int i;
     MpegEncContext *s = avctx->priv_data;
 
-    if(s==NULL || s->picture==NULL)
+    if (!s || !s->picture)
         return;
 
     for (i = 0; i < MAX_PICTURE_COUNT; i++)
diff --git a/libavcodec/mpegvideo_enc.c b/libavcodec/mpegvideo_enc.c
index ffcd9da36c..f5427df0c9 100644
--- a/libavcodec/mpegvideo_enc.c
+++ b/libavcodec/mpegvideo_enc.c
@@ -1379,7 +1379,7 @@ static int select_input_picture(MpegEncContext *s)
     s->reordered_input_picture[MAX_PICTURE_COUNT - 1] = NULL;
 
     /* set next picture type & ordering */
-    if (s->reordered_input_picture[0] == NULL && s->input_picture[0]) {
+    if (!s->reordered_input_picture[0] && s->input_picture[0]) {
         if (s->avctx->frame_skip_threshold || s->avctx->frame_skip_factor) {
             if (s->picture_in_gop_number < s->gop_size &&
                 s->next_picture_ptr &&
@@ -1394,7 +1394,7 @@ static int select_input_picture(MpegEncContext *s)
         }
 
         if (/*s->picture_in_gop_number >= s->gop_size ||*/
-            s->next_picture_ptr == NULL || s->intra_only) {
+            !s->next_picture_ptr || s->intra_only) {
             s->reordered_input_picture[0] = s->input_picture[0];
             s->reordered_input_picture[0]->f->pict_type = AV_PICTURE_TYPE_I;
             s->reordered_input_picture[0]->f->coded_picture_number =
@@ -1434,7 +1434,7 @@ static int select_input_picture(MpegEncContext *s)
                     }
                 }
                 for (i = 0; i < s->max_b_frames + 1; i++) {
-                    if (s->input_picture[i] == NULL ||
+                    if (!s->input_picture[i] ||
                         s->input_picture[i]->b_frame_score - 1 >
                             s->mb_num / s->avctx->b_sensitivity)
                         break;
diff --git a/libavcodec/options.c b/libavcodec/options.c
index 64b27e5768..ec9830face 100644
--- a/libavcodec/options.c
+++ b/libavcodec/options.c
@@ -144,7 +144,8 @@ AVCodecContext *avcodec_alloc_context3(const AVCodec *codec)
 {
     AVCodecContext *avctx= av_malloc(sizeof(AVCodecContext));
 
-    if(avctx==NULL) return NULL;
+    if (!avctx)
+        return NULL;
 
     if(avcodec_get_context_defaults3(avctx, codec) < 0){
         av_free(avctx);
diff --git a/libavcodec/opus_celt.c b/libavcodec/opus_celt.c
index fad471beb6..e8a8de7f45 100644
--- a/libavcodec/opus_celt.c
+++ b/libavcodec/opus_celt.c
@@ -1608,7 +1608,7 @@ static unsigned int celt_decode_band(CeltContext *s, OpusRangeCoder *rc,
                 for (j = 0; j < N; j++)
                     X[j] = 0.0f;
             } else {
-                if (lowband == NULL) {
+                if (!lowband) {
                     /* Noise */
                     for (j = 0; j < N; j++)
                         X[j] = (((int32_t)celt_rng(s)) >> 20);
diff --git a/libavcodec/qdm2.c b/libavcodec/qdm2.c
index bf830db940..2def546988 100644
--- a/libavcodec/qdm2.c
+++ b/libavcodec/qdm2.c
@@ -1506,7 +1506,7 @@ static void qdm2_decode_fft_packets(QDM2Context *q)
     int i, j, min, max, value, type, unknown_flag;
     GetBitContext gb;
 
-    if (q->sub_packet_list_B[0].packet == NULL)
+    if (!q->sub_packet_list_B[0].packet)
         return;
 
     /* reset minimum indexes for FFT coefficients */
diff --git a/libavcodec/roqvideo.c b/libavcodec/roqvideo.c
index eb8fc253ad..8eda93c13c 100644
--- a/libavcodec/roqvideo.c
+++ b/libavcodec/roqvideo.c
@@ -115,7 +115,7 @@ static inline void apply_motion_generic(RoqContext *ri, int x, int y, int deltax
         return;
     }
 
-    if (ri->last_frame->data[0] == NULL) {
+    if (!ri->last_frame->data[0]) {
         av_log(ri->avctx, AV_LOG_ERROR, "Invalid decode type. Invalid header?\n");
         return;
     }
diff --git a/libavcodec/rv10.c b/libavcodec/rv10.c
index 7bec038a9b..251823d453 100644
--- a/libavcodec/rv10.c
+++ b/libavcodec/rv10.c
@@ -330,7 +330,7 @@ static int rv20_decode_picture_header(RVDecContext *rv)
         av_log(s->avctx, AV_LOG_ERROR, "low delay B\n");
         return -1;
     }
-    if (s->last_picture_ptr == NULL && s->pict_type == AV_PICTURE_TYPE_B) {
+    if (!s->last_picture_ptr && s->pict_type == AV_PICTURE_TYPE_B) {
         av_log(s->avctx, AV_LOG_ERROR, "early B-frame\n");
         return AVERROR_INVALIDDATA;
     }
@@ -577,7 +577,7 @@ static int rv10_decode_packet(AVCodecContext *avctx, const uint8_t *buf,
         return AVERROR_INVALIDDATA;
     }
 
-    if ((s->mb_x == 0 && s->mb_y == 0) || s->current_picture_ptr == NULL) {
+    if ((s->mb_x == 0 && s->mb_y == 0) || !s->current_picture_ptr) {
         // FIXME write parser so we always have complete frames?
         if (s->current_picture_ptr) {
             ff_er_frame_end(&s->er);
diff --git a/libavcodec/tscc.c b/libavcodec/tscc.c
index a7a0c2ecaf..628a6b3c36 100644
--- a/libavcodec/tscc.c
+++ b/libavcodec/tscc.c
@@ -143,7 +143,7 @@ static av_cold int decode_init(AVCodecContext *avctx)
 
     /* Allocate decompression buffer */
     if (c->decomp_size) {
-        if ((c->decomp_buf = av_malloc(c->decomp_size)) == NULL) {
+        if (!(c->decomp_buf = av_malloc(c->decomp_size))) {
             av_log(avctx, AV_LOG_ERROR, "Can't allocate decompression buffer.\n");
             return AVERROR(ENOMEM);
         }
diff --git a/libavcodec/vc1dec.c b/libavcodec/vc1dec.c
index e1d8ca6ed5..7b7de45b45 100644
--- a/libavcodec/vc1dec.c
+++ b/libavcodec/vc1dec.c
@@ -6023,7 +6023,7 @@ static int vc1_decode_frame(AVCodecContext *avctx, void *data,
     s->current_picture.f->key_frame = s->pict_type == AV_PICTURE_TYPE_I;
 
     /* skip B-frames if we don't have reference frames */
-    if (s->last_picture_ptr == NULL && (s->pict_type == AV_PICTURE_TYPE_B || s->droppable)) {
+    if (!s->last_picture_ptr && (s->pict_type == AV_PICTURE_TYPE_B || s->droppable)) {
         av_log(v->s.avctx, AV_LOG_DEBUG, "Skipping B frame without reference frames\n");
         goto end;
     }
diff --git a/libavcodec/vp3.c b/libavcodec/vp3.c
index 3f04d8f258..bd1afc02ef 100644
--- a/libavcodec/vp3.c
+++ b/libavcodec/vp3.c
@@ -1429,7 +1429,7 @@ static void vp3_draw_horiz_band(Vp3DecodeContext *s, int y)
                                   0);
     }
 
-    if (s->avctx->draw_horiz_band == NULL)
+    if (!s->avctx->draw_horiz_band)
         return;
 
     h = y - s->last_slice_end;
diff --git a/libavcodec/vp8.c b/libavcodec/vp8.c
index 60accf6348..d72fb57311 100644
--- a/libavcodec/vp8.c
+++ b/libavcodec/vp8.c
@@ -2238,7 +2238,7 @@ static void vp8_decode_mv_mb_modes(AVCodecContext *avctx, VP8Frame *cur_frame,
         int pos              = (mb_y << 16) | (mb_x & 0xFFFF);                \
         int sliced_threading = (avctx->active_thread_type == FF_THREAD_SLICE) && \
                                (num_jobs > 1);                                \
-        int is_null          = (next_td == NULL) || (prev_td == NULL);        \
+        int is_null          = !next_td || !prev_td;                          \
         int pos_check        = (is_null) ? 1                                  \
                                          : (next_td != td &&                  \
                                             pos >= next_td->wait_mb_pos) ||   \
diff --git a/libavcodec/zmbv.c b/libavcodec/zmbv.c
index 21a9e35c39..c16d912117 100644
--- a/libavcodec/zmbv.c
+++ b/libavcodec/zmbv.c
@@ -500,7 +500,7 @@ static int decode_frame(AVCodecContext *avctx, void *data, int *got_frame, AVPac
         c->decode_intra= decode_intra;
     }
 
-    if (c->decode_intra == NULL) {
+    if (!c->decode_intra) {
         av_log(avctx, AV_LOG_ERROR, "Error! Got no format or no keyframe!\n");
         return AVERROR_INVALIDDATA;
     }
@@ -588,7 +588,7 @@ static av_cold int decode_init(AVCodecContext *avctx)
 
     /* Allocate decompression buffer */
     if (c->decomp_size) {
-        if ((c->decomp_buf = av_mallocz(c->decomp_size)) == NULL) {
+        if (!(c->decomp_buf = av_mallocz(c->decomp_size))) {
             av_log(avctx, AV_LOG_ERROR,
                    "Can't allocate decompression buffer.\n");
             return AVERROR(ENOMEM);
diff --git a/libavcodec/zmbvenc.c b/libavcodec/zmbvenc.c
index 28dbe20f06..2d56a13e01 100644
--- a/libavcodec/zmbvenc.c
+++ b/libavcodec/zmbvenc.c
@@ -296,7 +296,7 @@ static av_cold int encode_init(AVCodecContext *avctx)
     memset(&c->zstream, 0, sizeof(z_stream));
     c->comp_size = avctx->width * avctx->height + 1024 +
         ((avctx->width + ZMBV_BLOCK - 1) / ZMBV_BLOCK) * ((avctx->height + ZMBV_BLOCK - 1) / ZMBV_BLOCK) * 2 + 4;
-    if ((c->work_buf = av_malloc(c->comp_size)) == NULL) {
+    if (!(c->work_buf = av_malloc(c->comp_size))) {
         av_log(avctx, AV_LOG_ERROR, "Can't allocate work buffer.\n");
         return AVERROR(ENOMEM);
     }
@@ -305,12 +305,12 @@ static av_cold int encode_init(AVCodecContext *avctx)
                            ((c->comp_size + 63) >> 6) + 11;
 
     /* Allocate compression buffer */
-    if ((c->comp_buf = av_malloc(c->comp_size)) == NULL) {
+    if (!(c->comp_buf = av_malloc(c->comp_size))) {
         av_log(avctx, AV_LOG_ERROR, "Can't allocate compression buffer.\n");
         return AVERROR(ENOMEM);
     }
     c->pstride = FFALIGN(avctx->width, 16);
-    if ((c->prev = av_malloc(c->pstride * avctx->height)) == NULL) {
+    if (!(c->prev = av_malloc(c->pstride * avctx->height))) {
         av_log(avctx, AV_LOG_ERROR, "Can't allocate picture.\n");
         return AVERROR(ENOMEM);
     }
diff --git a/libavdevice/v4l2.c b/libavdevice/v4l2.c
index 64df0c7950..d9ff1a47e2 100644
--- a/libavdevice/v4l2.c
+++ b/libavdevice/v4l2.c
@@ -352,12 +352,12 @@ static int mmap_init(AVFormatContext *ctx)
     }
     s->buffers = req.count;
     s->buf_start = av_malloc_array(s->buffers, sizeof(void *));
-    if (s->buf_start == NULL) {
+    if (!s->buf_start) {
         av_log(ctx, AV_LOG_ERROR, "Cannot allocate buffer pointers\n");
         return AVERROR(ENOMEM);
     }
     s->buf_len = av_malloc_array(s->buffers, sizeof(unsigned int));
-    if (s->buf_len == NULL) {
+    if (!s->buf_len) {
         av_log(ctx, AV_LOG_ERROR, "Cannot allocate buffer sizes\n");
         av_free(s->buf_start);
         return AVERROR(ENOMEM);
@@ -558,7 +558,7 @@ FF_ENABLE_DEPRECATION_WARNINGS
 #endif
 
         buf_descriptor = av_malloc(sizeof(struct buff_data));
-        if (buf_descriptor == NULL) {
+        if (!buf_descriptor) {
             /* Something went wrong... Since av_malloc() failed, we cannot even
              * allocate a buffer for memcpying into it
              */
diff --git a/libavfilter/vf_vidstabtransform.c b/libavfilter/vf_vidstabtransform.c
index 80968aedcc..3ce4769483 100644
--- a/libavfilter/vf_vidstabtransform.c
+++ b/libavfilter/vf_vidstabtransform.c
@@ -207,7 +207,7 @@ static int config_input(AVFilterLink *inlink)
     av_log(ctx, AV_LOG_INFO, "    interpol  = %s\n", getInterpolationTypeName(tc->conf.interpolType));
 
     f = fopen(tc->input, "r");
-    if (f == NULL) {
+    if (!f) {
         av_log(ctx, AV_LOG_ERROR, "cannot open input file %s\n", tc->input);
         return AVERROR(errno);
     } else {
diff --git a/libavformat/avs.c b/libavformat/avs.c
index 7814301244..b699dbf9ba 100644
--- a/libavformat/avs.c
+++ b/libavformat/avs.c
@@ -182,7 +182,7 @@ static int avs_read_packet(AVFormatContext * s, AVPacket * pkt)
             case AVS_VIDEO:
                 if (!avs->st_video) {
                     avs->st_video = avformat_new_stream(s, NULL);
-                    if (avs->st_video == NULL)
+                    if (!avs->st_video)
                         return AVERROR(ENOMEM);
                     avs->st_video->codec->codec_type = AVMEDIA_TYPE_VIDEO;
                     avs->st_video->codec->codec_id = AV_CODEC_ID_AVS;
@@ -201,7 +201,7 @@ static int avs_read_packet(AVFormatContext * s, AVPacket * pkt)
             case AVS_AUDIO:
                 if (!avs->st_audio) {
                     avs->st_audio = avformat_new_stream(s, NULL);
-                    if (avs->st_audio == NULL)
+                    if (!avs->st_audio)
                         return AVERROR(ENOMEM);
                     avs->st_audio->codec->codec_type = AVMEDIA_TYPE_AUDIO;
                 }
diff --git a/libavformat/matroskadec.c b/libavformat/matroskadec.c
index 31ee4567aa..2dda729bab 100644
--- a/libavformat/matroskadec.c
+++ b/libavformat/matroskadec.c
@@ -1658,7 +1658,7 @@ static int matroska_parse_tracks(AVFormatContext *s)
                    track->type);
             continue;
         }
-        if (track->codec_id == NULL)
+        if (!track->codec_id)
             continue;
 
         if (track->type == MATROSKA_TRACK_TYPE_VIDEO) {
@@ -1735,7 +1735,7 @@ static int matroska_parse_tracks(AVFormatContext *s)
         }
 
         st = track->stream = avformat_new_stream(s, NULL);
-        if (st == NULL) {
+        if (!st) {
             av_free(key_id_base64);
             return AVERROR(ENOMEM);
         }
@@ -1821,7 +1821,7 @@ static int matroska_parse_tracks(AVFormatContext *s)
             int profile = matroska_aac_profile(track->codec_id);
             int sri     = matroska_aac_sri(track->audio.samplerate);
             extradata   = av_mallocz(5 + FF_INPUT_BUFFER_PADDING_SIZE);
-            if (extradata == NULL)
+            if (!extradata)
                 return AVERROR(ENOMEM);
             extradata[0] = (profile << 3) | ((sri & 0x0E) >> 1);
             extradata[1] = ((sri & 0x01) << 7) | (track->audio.channels << 3);
@@ -1840,7 +1840,7 @@ static int matroska_parse_tracks(AVFormatContext *s)
             extradata_size = 12 + track->codec_priv.size;
             extradata      = av_mallocz(extradata_size +
                                         FF_INPUT_BUFFER_PADDING_SIZE);
-            if (extradata == NULL)
+            if (!extradata)
                 return AVERROR(ENOMEM);
             AV_WB32(extradata, extradata_size);
             memcpy(&extradata[4], "alac", 4);
@@ -1850,7 +1850,7 @@ static int matroska_parse_tracks(AVFormatContext *s)
         } else if (codec_id == AV_CODEC_ID_TTA) {
             extradata_size = 30;
             extradata      = av_mallocz(extradata_size + FF_INPUT_BUFFER_PADDING_SIZE);
-            if (extradata == NULL)
+            if (!extradata)
                 return AVERROR(ENOMEM);
             ffio_init_context(&b, extradata, extradata_size, 1,
                               NULL, NULL, NULL, NULL);
@@ -2130,7 +2130,7 @@ static int matroska_read_header(AVFormatContext *s)
             av_log(matroska->ctx, AV_LOG_ERROR, "incomplete attachment\n");
         } else {
             AVStream *st = avformat_new_stream(s, NULL);
-            if (st == NULL)
+            if (!st)
                 break;
             av_dict_set(&st->metadata, "filename", attachments[j].filename, 0);
             av_dict_set(&st->metadata, "mimetype", attachments[j].mime, 0);
@@ -2561,7 +2561,7 @@ static int matroska_parse_webvtt(MatroskaDemuxContext *matroska,
         buf = av_packet_new_side_data(pkt,
                                       AV_PKT_DATA_WEBVTT_IDENTIFIER,
                                       id_len);
-        if (buf == NULL) {
+        if (!buf) {
             av_free(pkt);
             return AVERROR(ENOMEM);
         }
@@ -2572,7 +2572,7 @@ static int matroska_parse_webvtt(MatroskaDemuxContext *matroska,
         buf = av_packet_new_side_data(pkt,
                                       AV_PKT_DATA_WEBVTT_SETTINGS,
                                       settings_len);
-        if (buf == NULL) {
+        if (!buf) {
             av_free(pkt);
             return AVERROR(ENOMEM);
         }
@@ -2659,7 +2659,7 @@ static int matroska_parse_frame(MatroskaDemuxContext *matroska,
         uint8_t *side_data = av_packet_new_side_data(pkt,
                                                      AV_PKT_DATA_MATROSKA_BLOCKADDITIONAL,
                                                      additional_size + 8);
-        if (side_data == NULL) {
+        if (!side_data) {
             av_free_packet(pkt);
             av_free(pkt);
             return AVERROR(ENOMEM);
@@ -2672,7 +2672,7 @@ static int matroska_parse_frame(MatroskaDemuxContext *matroska,
         uint8_t *side_data = av_packet_new_side_data(pkt,
                                                      AV_PKT_DATA_SKIP_SAMPLES,
                                                      10);
-        if (side_data == NULL) {
+        if (!side_data) {
             av_free_packet(pkt);
             av_free(pkt);
             return AVERROR(ENOMEM);
@@ -3406,7 +3406,7 @@ static int webm_dash_manifest_read_header(AVFormatContext *s)
 
     // basename of the file
     buf = strrchr(s->filename, '/');
-    if (buf == NULL) return -1;
+    if (!buf) return -1;
     av_dict_set(&s->streams[0]->metadata, FILENAME, ++buf, 0);
 
     // duration
diff --git a/libavformat/matroskaenc.c b/libavformat/matroskaenc.c
index 3ec8ef27a9..7123ec6c96 100644
--- a/libavformat/matroskaenc.c
+++ b/libavformat/matroskaenc.c
@@ -309,7 +309,7 @@ static mkv_seekhead *mkv_start_seekhead(AVIOContext *pb, int64_t segment_offset,
                                         int numelements)
 {
     mkv_seekhead *new_seekhead = av_mallocz(sizeof(mkv_seekhead));
-    if (new_seekhead == NULL)
+    if (!new_seekhead)
         return NULL;
 
     new_seekhead->segment_offset = segment_offset;
@@ -335,7 +335,7 @@ static int mkv_add_seekhead_entry(mkv_seekhead *seekhead, unsigned int elementid
         return -1;
 
     entries = av_realloc_array(entries, seekhead->num_entries + 1, sizeof(mkv_seekhead_entry));
-    if (entries == NULL)
+    if (!entries)
         return AVERROR(ENOMEM);
     seekhead->entries = entries;
 
@@ -401,7 +401,7 @@ fail:
 static mkv_cues *mkv_start_cues(int64_t segment_offset)
 {
     mkv_cues *cues = av_mallocz(sizeof(mkv_cues));
-    if (cues == NULL)
+    if (!cues)
         return NULL;
 
     cues->segment_offset = segment_offset;
@@ -417,7 +417,7 @@ static int mkv_add_cuepoint(mkv_cues *cues, int stream, int tracknum, int64_t ts
         return 0;
 
     entries = av_realloc_array(entries, cues->num_entries + 1, sizeof(mkv_cuepoint));
-    if (entries == NULL)
+    if (!entries)
         return AVERROR(ENOMEM);
     cues->entries = entries;
 
@@ -1336,7 +1336,7 @@ static int mkv_write_header(AVFormatContext *s)
         mkv_write_seekhead(pb, mkv->main_seekhead);
 
     mkv->cues = mkv_start_cues(mkv->segment_offset);
-    if (mkv->cues == NULL)
+    if (!mkv->cues)
         return AVERROR(ENOMEM);
 
     if (pb->seekable && mkv->reserve_cues_space) {
diff --git a/libavformat/movenc.c b/libavformat/movenc.c
index 20710be41c..5d7682c293 100644
--- a/libavformat/movenc.c
+++ b/libavformat/movenc.c
@@ -2065,7 +2065,7 @@ static int mov_write_track_udta_tag(AVIOContext *pb, MOVMuxContext *mov,
     int ret, size;
     uint8_t *buf;
 
-    if (st == NULL || mov->fc->flags & AVFMT_FLAG_BITEXACT)
+    if (!st || mov->fc->flags & AVFMT_FLAG_BITEXACT)
         return 0;
 
     ret = avio_open_dyn_buf(&pb_buf);
diff --git a/libavformat/mpegts.c b/libavformat/mpegts.c
index d2a25317d9..2d15a6a036 100644
--- a/libavformat/mpegts.c
+++ b/libavformat/mpegts.c
@@ -2037,7 +2037,7 @@ static int handle_packet(MpegTSContext *ts, const uint8_t *packet)
         return 0;
     is_start = packet[1] & 0x40;
     tss = ts->pids[pid];
-    if (ts->auto_guess && tss == NULL && is_start) {
+    if (ts->auto_guess && !tss && is_start) {
         add_pes_stream(ts, pid, -1);
         tss = ts->pids[pid];
     }
diff --git a/libavformat/mpegtsenc.c b/libavformat/mpegtsenc.c
index c925afbe1a..208360f465 100644
--- a/libavformat/mpegtsenc.c
+++ b/libavformat/mpegtsenc.c
@@ -481,7 +481,7 @@ static int mpegts_write_pmt(AVFormatContext *s, MpegTSService *service)
     return 0;
 }
 
-/* NOTE: str == NULL is accepted for an empty string */
+/* NOTE: !str is accepted for an empty string */
 static void putstr8(uint8_t **q_ptr, const char *str)
 {
     uint8_t *q;
diff --git a/libavformat/nsvdec.c b/libavformat/nsvdec.c
index 926e88ec8a..8200e4defa 100644
--- a/libavformat/nsvdec.c
+++ b/libavformat/nsvdec.c
@@ -665,7 +665,7 @@ static int nsv_read_packet(AVFormatContext *s, AVPacket *pkt)
     av_dlog(s, "%s()\n", __FUNCTION__);
 
     /* in case we don't already have something to eat ... */
-    if (nsv->ahead[0].data == NULL && nsv->ahead[1].data == NULL)
+    if (!nsv->ahead[0].data && !nsv->ahead[1].data)
         err = nsv_read_chunk(s, 0);
     if (err < 0)
         return err;
diff --git a/libavformat/oggdec.c b/libavformat/oggdec.c
index dcead1c227..f17393bfa8 100644
--- a/libavformat/oggdec.c
+++ b/libavformat/oggdec.c
@@ -796,7 +796,7 @@ retry:
         uint8_t *side_data = av_packet_new_side_data(pkt,
                                                      AV_PKT_DATA_SKIP_SAMPLES,
                                                      10);
-        if(side_data == NULL)
+        if(!side_data)
             goto fail;
         AV_WL32(side_data + 4, os->end_trimming);
         os->end_trimming = 0;
@@ -806,7 +806,7 @@ retry:
         uint8_t *side_data = av_packet_new_side_data(pkt,
                                                      AV_PKT_DATA_METADATA_UPDATE,
                                                      os->new_metadata_size);
-        if(side_data == NULL)
+        if(!side_data)
             goto fail;
 
         memcpy(side_data, os->new_metadata, os->new_metadata_size);
diff --git a/libavformat/rtpenc.c b/libavformat/rtpenc.c
index e7527c774a..4f9edef0cc 100644
--- a/libavformat/rtpenc.c
+++ b/libavformat/rtpenc.c
@@ -145,7 +145,7 @@ static int rtp_write_header(AVFormatContext *s1)
         return AVERROR(EIO);
     }
     s->buf = av_malloc(s1->packet_size);
-    if (s->buf == NULL) {
+    if (!s->buf) {
         return AVERROR(ENOMEM);
     }
     s->max_payload_size = s1->packet_size - 12;
diff --git a/libavformat/rtspdec.c b/libavformat/rtspdec.c
index 51c80c61eb..b4b4f12556 100644
--- a/libavformat/rtspdec.c
+++ b/libavformat/rtspdec.c
@@ -412,7 +412,7 @@ static inline int parse_command_line(AVFormatContext *s, const char *line,
     }
 
     searchlinept = strchr(linept, ' ');
-    if (searchlinept == NULL) {
+    if (!searchlinept) {
         av_log(s, AV_LOG_ERROR, "Error parsing message URI\n");
         return AVERROR_INVALIDDATA;
     }
diff --git a/libavformat/rtspenc.c b/libavformat/rtspenc.c
index af6f7996dc..12fb4102dc 100644
--- a/libavformat/rtspenc.c
+++ b/libavformat/rtspenc.c
@@ -56,7 +56,7 @@ int ff_rtsp_setup_output_streams(AVFormatContext *s, const char *addr)
 
     /* Announce the stream */
     sdp = av_mallocz(SDP_MAX_SIZE);
-    if (sdp == NULL)
+    if (!sdp)
         return AVERROR(ENOMEM);
     /* We create the SDP based on the RTSP AVFormatContext where we
      * aren't allowed to change the filename field. (We create the SDP
diff --git a/libavformat/sdp.c b/libavformat/sdp.c
index c53de90517..8c831f3607 100644
--- a/libavformat/sdp.c
+++ b/libavformat/sdp.c
@@ -189,7 +189,7 @@ static char *extradata2psets(AVCodecContext *c)
     }
 
     psets = av_mallocz(MAX_PSET_SIZE);
-    if (psets == NULL) {
+    if (!psets) {
         av_log(c, AV_LOG_ERROR, "Cannot allocate memory for the parameter sets.\n");
         av_free(orig_extradata);
         return NULL;
@@ -216,7 +216,7 @@ static char *extradata2psets(AVCodecContext *c)
             sps = r;
             sps_end = r1;
         }
-        if (av_base64_encode(p, MAX_PSET_SIZE - (p - psets), r, r1 - r) == NULL) {
+        if (!av_base64_encode(p, MAX_PSET_SIZE - (p - psets), r, r1 - r)) {
             av_log(c, AV_LOG_ERROR, "Cannot Base64-encode %"PTRDIFF_SPECIFIER" %"PTRDIFF_SPECIFIER"!\n", MAX_PSET_SIZE - (p - psets), r1 - r);
             av_free(psets);
 
@@ -250,7 +250,7 @@ static char *extradata2config(AVCodecContext *c)
         return NULL;
     }
     config = av_malloc(10 + c->extradata_size * 2);
-    if (config == NULL) {
+    if (!config) {
         av_log(c, AV_LOG_ERROR, "Cannot allocate memory for the config info.\n");
         return NULL;
     }
@@ -457,7 +457,7 @@ static char *sdp_write_media_attributes(char *buff, int size, AVCodecContext *c,
                     av_log(c, AV_LOG_ERROR, "AAC with no global headers is currently not supported.\n");
                     return NULL;
                 }
-                if (config == NULL) {
+                if (!config) {
                     return NULL;
                 }
                 av_strlcatf(buff, size, "a=rtpmap:%d MPEG4-GENERIC/%d/%d\r\n"
diff --git a/libavformat/webmdashenc.c b/libavformat/webmdashenc.c
index 381efb7888..9cc8d1928c 100644
--- a/libavformat/webmdashenc.c
+++ b/libavformat/webmdashenc.c
@@ -70,7 +70,7 @@ static double get_duration(AVFormatContext *s)
     for (i = 0; i < s->nb_streams; i++) {
         AVDictionaryEntry *duration = av_dict_get(s->streams[i]->metadata,
                                                   DURATION, NULL, 0);
-        if (duration == NULL || atof(duration->value) < 0) continue;
+        if (!duration || atof(duration->value) < 0) continue;
         if (atof(duration->value) > max) max = atof(duration->value);
     }
     return max / 1000;
@@ -102,11 +102,11 @@ static int subsegment_alignment(AVFormatContext *s, AdaptationSet *as) {
     int i;
     AVDictionaryEntry *gold = av_dict_get(s->streams[as->streams[0]]->metadata,
                                           CUE_TIMESTAMPS, NULL, 0);
-    if (gold == NULL) return 0;
+    if (!gold) return 0;
     for (i = 1; i < as->nb_streams; i++) {
         AVDictionaryEntry *ts = av_dict_get(s->streams[as->streams[i]]->metadata,
                                             CUE_TIMESTAMPS, NULL, 0);
-        if (ts == NULL || strncmp(gold->value, ts->value, strlen(gold->value))) return 0;
+        if (!ts || strncmp(gold->value, ts->value, strlen(gold->value))) return 0;
     }
     return 1;
 }
@@ -116,12 +116,12 @@ static int bitstream_switching(AVFormatContext *s, AdaptationSet *as) {
     AVDictionaryEntry *gold_track_num = av_dict_get(s->streams[as->streams[0]]->metadata,
                                                     TRACK_NUMBER, NULL, 0);
     AVCodecContext *gold_codec = s->streams[as->streams[0]]->codec;
-    if (gold_track_num == NULL) return 0;
+    if (!gold_track_num) return 0;
     for (i = 1; i < as->nb_streams; i++) {
         AVDictionaryEntry *track_num = av_dict_get(s->streams[as->streams[i]]->metadata,
                                                    TRACK_NUMBER, NULL, 0);
         AVCodecContext *codec = s->streams[as->streams[i]]->codec;
-        if (track_num == NULL ||
+        if (!track_num ||
             strncmp(gold_track_num->value, track_num->value, strlen(gold_track_num->value)) ||
             gold_codec->codec_id != codec->codec_id ||
             gold_codec->extradata_size != codec->extradata_size ||
@@ -167,7 +167,7 @@ static int write_adaptation_set(AVFormatContext *s, int as_index)
     for (i = 0; i < as->nb_streams; i++) {
         AVDictionaryEntry *kf = av_dict_get(s->streams[as->streams[i]]->metadata,
                                             CLUSTER_KEYFRAME, NULL, 0);
-        if (kf == NULL || !strncmp(kf->value, "0", 1)) subsegmentStartsWithSAP = 0;
+        if (!kf || !strncmp(kf->value, "0", 1)) subsegmentStartsWithSAP = 0;
     }
     avio_printf(s->pb, " subsegmentStartsWithSAP=\"%d\"", subsegmentStartsWithSAP);
     avio_printf(s->pb, ">\n");
@@ -179,8 +179,8 @@ static int write_adaptation_set(AVFormatContext *s, int as_index)
         AVDictionaryEntry *cues_end = av_dict_get(stream->metadata, CUES_END, NULL, 0);
         AVDictionaryEntry *filename = av_dict_get(stream->metadata, FILENAME, NULL, 0);
         AVDictionaryEntry *bandwidth = av_dict_get(stream->metadata, BANDWIDTH, NULL, 0);
-        if (irange == NULL || cues_start == NULL || cues_end == NULL || filename == NULL ||
-            bandwidth == NULL) {
+        if (!irange || cues_start == NULL || cues_end == NULL || filename == NULL ||
+            !bandwidth) {
             return -1;
         }
         avio_printf(s->pb, "<Representation id=\"%d\"", i);
@@ -202,7 +202,7 @@ static int to_integer(char *p, int len)
 {
     int ret;
     char *q = av_malloc(sizeof(char) * len);
-    if (q == NULL) return -1;
+    if (!q) return -1;
     strncpy(q, p, len);
     ret = atoi(q);
     av_free(q);
diff --git a/libavutil/eval.c b/libavutil/eval.c
index 99993b9d49..5099e57fae 100644
--- a/libavutil/eval.c
+++ b/libavutil/eval.c
@@ -359,7 +359,7 @@ static int parse_primary(AVExpr **e, Parser *p)
     }
 
     p->s= strchr(p->s, '(');
-    if (p->s==NULL) {
+    if (!p->s) {
         av_log(p, AV_LOG_ERROR, "Undefined constant or missing '(' in '%s'\n", s0);
         p->s= next;
         av_expr_free(d);
diff --git a/libavutil/file.c b/libavutil/file.c
index 45fe8538de..5e0dc7ab68 100644
--- a/libavutil/file.c
+++ b/libavutil/file.c
@@ -152,7 +152,7 @@ int av_tempfile(const char *prefix, char **filename, int log_offset, void *log_c
     *filename = av_malloc(len);
 #endif
     /* -----common section-----*/
-    if (*filename == NULL) {
+    if (!*filename) {
         av_log(&file_log_ctx, AV_LOG_ERROR, "ff_tempfile: Cannot allocate file name\n");
         return AVERROR(ENOMEM);
     }
diff --git a/libavutil/imgutils.h b/libavutil/imgutils.h
index 23282a38fa..2ec246aa48 100644
--- a/libavutil/imgutils.h
+++ b/libavutil/imgutils.h
@@ -130,7 +130,7 @@ void av_image_copy(uint8_t *dst_data[4], int dst_linesizes[4],
  * line sizes will be set.  If a planar format is specified, several
  * pointers will be set pointing to the different picture planes and
  * the line sizes of the different planes will be stored in the
- * lines_sizes array. Call with src == NULL to get the required
+ * lines_sizes array. Call with !src to get the required
  * size for the src buffer.
  *
  * To allocate the buffer and fill in the dst_data and dst_linesize in
diff --git a/libavutil/internal.h b/libavutil/internal.h
index 2d1b37b719..612b5f26af 100644
--- a/libavutil/internal.h
+++ b/libavutil/internal.h
@@ -132,7 +132,7 @@
 #define FF_ALLOC_OR_GOTO(ctx, p, size, label)\
 {\
     p = av_malloc(size);\
-    if (p == NULL && (size) != 0) {\
+    if (!(p) && (size) != 0) {\
         av_log(ctx, AV_LOG_ERROR, "Cannot allocate memory.\n");\
         goto label;\
     }\
@@ -141,7 +141,7 @@
 #define FF_ALLOCZ_OR_GOTO(ctx, p, size, label)\
 {\
     p = av_mallocz(size);\
-    if (p == NULL && (size) != 0) {\
+    if (!(p) && (size) != 0) {\
         av_log(ctx, AV_LOG_ERROR, "Cannot allocate memory.\n");\
         goto label;\
     }\
@@ -150,7 +150,7 @@
 #define FF_ALLOC_ARRAY_OR_GOTO(ctx, p, nelem, elsize, label)\
 {\
     p = av_malloc_array(nelem, elsize);\
-    if (p == NULL) {\
+    if (!p) {\
         av_log(ctx, AV_LOG_ERROR, "Cannot allocate memory.\n");\
         goto label;\
     }\
@@ -159,7 +159,7 @@
 #define FF_ALLOCZ_ARRAY_OR_GOTO(ctx, p, nelem, elsize, label)\
 {\
     p = av_mallocz_array(nelem, elsize);\
-    if (p == NULL) {\
+    if (!p) {\
         av_log(ctx, AV_LOG_ERROR, "Cannot allocate memory.\n");\
         goto label;\
     }\
diff --git a/libpostproc/postprocess.c b/libpostproc/postprocess.c
index da586ffd31..3132d5906b 100644
--- a/libpostproc/postprocess.c
+++ b/libpostproc/postprocess.c
@@ -716,10 +716,10 @@ pp_mode *pp_get_mode_by_name_and_quality(const char *name, int quality)
         int enable=1; //does the user want us to enabled or disabled the filter
 
         filterToken= strtok(p, filterDelimiters);
-        if(filterToken == NULL) break;
+        if(!filterToken) break;
         p+= strlen(filterToken) + 1; // p points to next filterToken
         filterName= strtok(filterToken, optionDelimiters);
-        if (filterName == NULL) {
+        if (!filterName) {
             ppMode->error++;
             break;
         }
@@ -732,7 +732,7 @@ pp_mode *pp_get_mode_by_name_and_quality(const char *name, int quality)
 
         for(;;){ //for all options
             option= strtok(NULL, optionDelimiters);
-            if(option == NULL) break;
+            if(!option) break;
 
             av_log(NULL, AV_LOG_DEBUG, "pp: option: %s\n", option);
             if(!strcmp("autoq", option) || !strcmp("a", option)) q= quality;
@@ -967,7 +967,7 @@ void  pp_postprocess(const uint8_t * src[3], const int srcStride[3],
                        FFMAX(minStride, c->stride),
                        FFMAX(c->qpStride, absQPStride));
 
-    if(QP_store==NULL || (mode->lumMode & FORCE_QUANT)){
+    if(!QP_store || (mode->lumMode & FORCE_QUANT)){
         int i;
         QP_store= c->forcedQPTable;
         absQPStride = QPStride = 0;
diff --git a/tools/crypto_bench.c b/tools/crypto_bench.c
index 1a699ce684..96820ae428 100644
--- a/tools/crypto_bench.c
+++ b/tools/crypto_bench.c
@@ -173,7 +173,7 @@ static void run_gcrypt_aes128(uint8_t *output,
                               const uint8_t *input, unsigned size)
 {
     static gcry_cipher_hd_t aes;
-    if (aes == NULL)
+    if (!aes)
         gcry_cipher_open(&aes, GCRY_CIPHER_AES128, GCRY_CIPHER_MODE_ECB, 0);
     gcry_cipher_setkey(aes, hardcoded_key, 16);
     gcry_cipher_encrypt(aes, output, size, input, size);