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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.
``--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>``
Adjust subtitle timing is to remove minor gaps or overlaps between
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)},
{"image-subs-video-resolution", OPT_BOOL(image_subs_video_res)},
{"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-gauss", OPT_FLOAT(sub_gauss), M_RANGE(0.0, 3.0)},
{"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 image_subs_video_res;
bool sub_fix_timing;
bool sub_stretch_durations;
bool sub_scale_by_window;
bool sub_scale_with_window;
bool ass_scale_with_window;

3
sub/sd_ass.c
View File

@ -341,7 +341,8 @@ static void decode(struct sd *sd, struct demux_packet *packet)
double sub_duration = 0;
char **r = lavc_conv_decode(ctx->converter, packet, &sub_pts,
&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) {
MP_WARN(sd, "Subtitle with unknown duration.\n");
ctx->duration_unknown = true;