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check time_base.den for mpeg4

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avoid zero time_base.* for h263

Originally committed as revision 4483 to svn://svn.ffmpeg.org/ffmpeg/trunk
This commit is contained in:
Michael Niedermayer 2005-07-30 16:15:36 +00:00
parent 2f300f8965
commit efbc614de0
1 changed files with 5 additions and 0 deletions
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5
libavcodec/h263.c
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@ -5156,6 +5156,7 @@ int h263_decode_picture_header(MpegEncContext *s)
s->avctx->time_base.num*= get_bits(&s->gb, 7);
if(s->avctx->time_base.num == 0){
av_log(s, AV_LOG_ERROR, "zero framerate\n");
s->avctx->time_base= (AVRational){1001, 30000}; //prevent crash
return -1;
}
gcd= ff_gcd(s->avctx->time_base.den, s->avctx->time_base.num);
@ -5538,6 +5539,10 @@ static int decode_vol_header(MpegEncContext *s, GetBitContext *gb){
check_marker(gb, "before time_increment_resolution");
s->avctx->time_base.den = get_bits(gb, 16);
if(!s->avctx->time_base.den){
av_log(s->avctx, AV_LOG_ERROR, "time_base.den==0\n");
return -1;
}
s->time_increment_bits = av_log2(s->avctx->time_base.den - 1) + 1;
if (s->time_increment_bits < 1)