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sub: add --sub-stretch-durations option 

Stretch a subtitle duration so it ends when the next one starts.
 Should help with subtitles which erroneously have zero durations.

 I found such a subrip substitles stream in the wild.

Signed-off-by: Mohammad AlSaleh <CE.Mohammad.AlSaleh@gmail.com>
This commit is contained in:
Mohammad AlSaleh 2023-10-28 15:54:43 +03:00 committed by Dudemanguy
parent c2b3d967ba
commit d470766000
4 changed files with 12 additions and 1 deletions
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8
DOCS/man/options.rst
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@ -2648,6 +2648,14 @@ Subtitles
particular subtitles in mkv files) are always assumed to be UTF-8. particular subtitles in mkv files) are always assumed to be UTF-8.
``--sub-stretch-durations=<yes|no>``
Stretch a subtitle duration so it ends when the next one starts.
Should help with subtitles which erroneously have zero durations.
.. note::
Only applies to text subtitles.
``--sub-fix-timing=<yes|no>`` ``--sub-fix-timing=<yes|no>``
Adjust subtitle timing is to remove minor gaps or overlaps between Adjust subtitle timing is to remove minor gaps or overlaps between
subtitles (if the difference is smaller than 210 ms, the gap or overlap subtitles (if the difference is smaller than 210 ms, the gap or overlap

1
options/options.c
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@ -291,6 +291,7 @@ const struct m_sub_options mp_subtitle_sub_opts = {
{"stretch-image-subs-to-screen", OPT_BOOL(stretch_image_subs)}, {"stretch-image-subs-to-screen", OPT_BOOL(stretch_image_subs)},
{"image-subs-video-resolution", OPT_BOOL(image_subs_video_res)}, {"image-subs-video-resolution", OPT_BOOL(image_subs_video_res)},
{"sub-fix-timing", OPT_BOOL(sub_fix_timing)}, {"sub-fix-timing", OPT_BOOL(sub_fix_timing)},
{"sub-stretch-durations", OPT_BOOL(sub_stretch_durations)},
{"sub-pos", OPT_FLOAT(sub_pos), M_RANGE(0.0, 150.0)}, {"sub-pos", OPT_FLOAT(sub_pos), M_RANGE(0.0, 150.0)},
{"sub-gauss", OPT_FLOAT(sub_gauss), M_RANGE(0.0, 3.0)}, {"sub-gauss", OPT_FLOAT(sub_gauss), M_RANGE(0.0, 3.0)},
{"sub-gray", OPT_BOOL(sub_gray)}, {"sub-gray", OPT_BOOL(sub_gray)},

1
options/options.h
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@ -93,6 +93,7 @@ struct mp_subtitle_opts {
bool stretch_image_subs; bool stretch_image_subs;
bool image_subs_video_res; bool image_subs_video_res;
bool sub_fix_timing; bool sub_fix_timing;
bool sub_stretch_durations;
bool sub_scale_by_window; bool sub_scale_by_window;
bool sub_scale_with_window; bool sub_scale_with_window;
bool ass_scale_with_window; bool ass_scale_with_window;

3
sub/sd_ass.c
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@ -341,7 +341,8 @@ static void decode(struct sd *sd, struct demux_packet *packet)
double sub_duration = 0; double sub_duration = 0;
char **r = lavc_conv_decode(ctx->converter, packet, &sub_pts, char **r = lavc_conv_decode(ctx->converter, packet, &sub_pts,
&sub_duration); &sub_duration);
if (packet->duration < 0 || sub_duration == UINT32_MAX) { if (sd->opts->sub_stretch_durations ||
packet->duration < 0 || sub_duration == UINT32_MAX) {
if (!ctx->duration_unknown) { if (!ctx->duration_unknown) {
MP_WARN(sd, "Subtitle with unknown duration.\n"); MP_WARN(sd, "Subtitle with unknown duration.\n");
ctx->duration_unknown = true; ctx->duration_unknown = true;