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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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8
fftools/ffmpeg.h
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@@ -224,6 +224,8 @@ typedef struct OptionsContext {
int nb_reinit_filters;
SpecifierOpt *fix_sub_duration;
int nb_fix_sub_duration;
SpecifierOpt *fix_sub_duration_heartbeat;
int nb_fix_sub_duration_heartbeat;
SpecifierOpt *canvas_sizes;
int nb_canvas_sizes;
SpecifierOpt *pass;
@@ -675,6 +677,12 @@ typedef struct OutputStream {
EncStats enc_stats_pre;
EncStats enc_stats_post;
/*
* bool on whether this stream should be utilized for splitting
* subtitles utilizing fix_sub_duration at random access points.
*/
unsigned int fix_sub_duration_heartbeat;
} OutputStream;
typedef struct OutputFile {