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avformat/mux: Allow muxers to set custom min timestamp

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Matroska requires pts to be >= 0 with a slight exception:
It has a mechanism to deal with codec delay, i.e. with
the data added at the beginning that does not correspond
to actual input data and should be discarded by the player.
Only the audio actually intended to be output needs to have
a timestamp >= 0.
In order to avoid unnecessary timestamp shifting, this patch
allows muxers to inform the shifting code about this so that
it can take it into account.

Signed-off-by: Andreas Rheinhardt <andreas.rheinhardt@outlook.com>
This commit is contained in:
Andreas Rheinhardt
2022-09-01 01:26:48 +02:00
parent eb325324aa
commit 1a8309e954
2 changed files with 12 additions and 2 deletions
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7
libavformat/mux.c
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@@ -632,6 +632,8 @@ static void handle_avoid_negative_ts(FFFormatContext *si, FFStream *sti,
if (ts == AV_NOPTS_VALUE)
return;
ts -= sti->lowest_ts_allowed;
/* Peek into the muxing queue to improve our estimate
* of the lowest timestamp if av_interleaved_write_frame() is used. */
for (const PacketListEntry *pktl = si->packet_buffer.head;
@@ -640,6 +642,7 @@ static void handle_avoid_negative_ts(FFFormatContext *si, FFStream *sti,
int64_t cmp_ts = use_pts ? pktl->pkt.pts : pktl->pkt.dts;
if (cmp_ts == AV_NOPTS_VALUE)
continue;
cmp_ts -= ffstream(s->streams[pktl->pkt.stream_index])->lowest_ts_allowed;
if (s->output_ts_offset)
cmp_ts += av_rescale_q(s->output_ts_offset, AV_TIME_BASE_Q, cmp_tb);
if (av_compare_ts(cmp_ts, cmp_tb, ts, tb) < 0) {
@@ -669,7 +672,7 @@ static void handle_avoid_negative_ts(FFFormatContext *si, FFStream *sti,
pkt->pts += offset;
if (si->avoid_negative_ts_use_pts) {
if (pkt->pts != AV_NOPTS_VALUE && pkt->pts < 0) {
if (pkt->pts != AV_NOPTS_VALUE && pkt->pts < sti->lowest_ts_allowed) {
av_log(s, AV_LOG_WARNING, "failed to avoid negative "
"pts %s in stream %d.\n"
"Try -avoid_negative_ts 1 as a possible workaround.\n",
@@ -678,7 +681,7 @@ static void handle_avoid_negative_ts(FFFormatContext *si, FFStream *sti,
);
}
} else {
if (pkt->dts != AV_NOPTS_VALUE && pkt->dts < 0) {
if (pkt->dts != AV_NOPTS_VALUE && pkt->dts < sti->lowest_ts_allowed) {
av_log(s, AV_LOG_WARNING,
"Packets poorly interleaved, failed to avoid negative "
"timestamp %s in stream %d.\n"