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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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4
fftools/ffmpeg_mux_init.c
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@@ -61,6 +61,7 @@ static const char *const opt_name_enc_stats_pre_fmt[] = {"enc_stats_pre_
static const char *const opt_name_enc_stats_post_fmt[] = {"enc_stats_post_fmt", NULL};
static const char *const opt_name_filters[] = {"filter", "af", "vf", NULL};
static const char *const opt_name_filter_scripts[] = {"filter_script", NULL};
static const char *const opt_name_fix_sub_duration_heartbeat[] = {"fix_sub_duration_heartbeat", NULL};
static const char *const opt_name_fps_mode[] = {"fps_mode", NULL};
static const char *const opt_name_force_fps[] = {"force_fps", NULL};
static const char *const opt_name_forced_key_frames[] = {"forced_key_frames", NULL};
@@ -614,6 +615,9 @@ static OutputStream *new_output_stream(Muxer *mux, const OptionsContext *o,
MATCH_PER_STREAM_OPT(bits_per_raw_sample, i, ost->bits_per_raw_sample,
oc, st);
MATCH_PER_STREAM_OPT(fix_sub_duration_heartbeat, i, ost->fix_sub_duration_heartbeat,
oc, st);
if (oc->oformat->flags & AVFMT_GLOBALHEADER && ost->enc_ctx)
ost->enc_ctx->flags |= AV_CODEC_FLAG_GLOBAL_HEADER;