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https://github.com/mpv-player/mpv
synced 2024-08-24 07:21:49 +02:00
options: add -sub-speed option
Should we actually get into trouble for unproper handling of frame-based subtitle formats, this might be the simplest way to work this around. Also is a bit more intuitive than -subfps, which might use an unknown, misdetected, or non-sense video FPS. Still pretty silly, though.
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@ -2062,6 +2062,8 @@
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*NOTE*: <rate> > movie fps speeds the subtitles up for frame-based
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subtitle files and slows them down for time-based ones.
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Also see ``--sub-speed`` option.
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--sub-gauss=<0.0-3.0>
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Apply gaussian blur to image subtitles (default: 0). This can help making
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pixelated DVD/Vobsubs look nicer. A value other than 0 also switches to
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@ -2088,6 +2090,16 @@
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*NOTE*: this affects ASS subtitles as well, and may lead to incorrect
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subtitle rendering. Use with care, or use ``--sub-text-font-size`` instead.
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--sub-speed=<0.1-10.0>
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Multiply the subtitle event timestamps with the given value. Can be used
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to fix the playback speed for frame-based subtitle formats. Works for
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external text subtitles only.
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*EXAMPLE*:
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- ``--sub-speed=25/23.976`` play frame based subtitles, which have been
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loaded assuming a framerate of 23.976, at 25 FPS.
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--sws=<n>
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Specify the software scaler algorithm to be used with ``--vf=scale``. This
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also affects video output drivers which lack hardware acceleration,
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@ -492,6 +492,7 @@ const m_option_t mp_opts[] = {
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OPT_STRING("subcp", sub_cp, 0),
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OPT_FLOAT("sub-delay", sub_delay, 0),
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OPT_FLOAT("subfps", sub_fps, 0),
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OPT_FLOAT("sub-speed", sub_speed, 0),
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OPT_FLAG("autosub", sub_auto, 0),
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OPT_FLAG("sub-visibility", sub_visibility, 0),
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OPT_FLAG("sub-forced-only", forced_subs_only, 0),
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@ -786,6 +787,7 @@ const struct MPOpts mp_default_opts = {
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.audio_display = 1,
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.sub_visibility = 1,
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.sub_pos = 100,
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.sub_speed = 1.0,
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.extension_parsing = 1,
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.audio_output_channels = MP_CHMAP_INIT_STEREO,
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.audio_output_format = -1, // AF_FORMAT_UNKNOWN
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@ -141,6 +141,7 @@ typedef struct MPOpts {
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int sub_pos;
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float sub_delay;
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float sub_fps;
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float sub_speed;
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int forced_subs_only;
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char *quvi_format;
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@ -401,12 +401,19 @@ bool sub_read_all_packets(struct dec_sub *sub, struct sh_sub *sh)
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if (sub->charset)
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mp_msg(MSGT_OSD, MSGL_INFO, "Using subtitle charset: %s\n", sub->charset);
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double sub_speed = 1.0;
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// 23.976 FPS is used as default timebase for frame based formats
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if (sub->video_fps && sh->frame_based)
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multiply_timings(subs, sub->video_fps / 23.976);
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sub_speed *= sub->video_fps / 23.976;
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if (opts->sub_fps && sub->video_fps)
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multiply_timings(subs, opts->sub_fps / sub->video_fps);
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sub_speed *= opts->sub_fps / sub->video_fps;
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sub_speed *= opts->sub_speed;
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if (sub_speed != 1.0)
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multiply_timings(subs, sub_speed);
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if (!opts->suboverlap_enabled)
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fix_overlaps_and_gaps(subs);
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