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ffmpeg: add video heartbeat capability to fix_sub_duration

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Splits the currently handled subtitle at random access point
packets that can be configured to follow a specific output stream.
Currently only subtitle streams which are directly mapped into the
same output in which the heartbeat stream resides are affected.

This way the subtitle - which is known to be shown at this time
can be split and passed to muxer before its full duration is
yet known. This is also a drawback, as this essentially outputs
multiple subtitles from a single input subtitle that continues
over multiple random access points. Thus this feature should not
be utilized in cases where subtitle output latency does not matter.

Co-authored-by: Andrzej Nadachowski <andrzej.nadachowski@24i.com>
Co-authored-by: Bernard Boulay <bernard.boulay@24i.com>

Signed-off-by: Jan Ekström <jan.ekstrom@24i.com>
This commit is contained in:
Jan Ekström
2022-07-22 13:57:54 +03:00
committed by Jan Ekström
parent 746d27455b
commit 9a820ec8b1
8 changed files with 245 additions and 0 deletions
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5
fftools/ffmpeg_opt.c
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@@ -1658,6 +1658,11 @@ const OptionDef options[] = {
{ "autoscale", HAS_ARG | OPT_BOOL | OPT_SPEC |
OPT_EXPERT | OPT_OUTPUT, { .off = OFFSET(autoscale) },
"automatically insert a scale filter at the end of the filter graph" },
{ "fix_sub_duration_heartbeat", OPT_VIDEO | OPT_BOOL | OPT_EXPERT |
OPT_SPEC | OPT_OUTPUT, { .off = OFFSET(fix_sub_duration_heartbeat) },
"set this video output stream to be a heartbeat stream for "
"fix_sub_duration, according to which subtitles should be split at "
"random access points" },
/* audio options */
{ "aframes", OPT_AUDIO | HAS_ARG | OPT_PERFILE | OPT_OUTPUT, { .func_arg = opt_audio_frames },