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Code Issues Releases Activity

avformat/mpegts: unset DTS/PTS for subtitle PES packets if PCR not available

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Fixes issues when a subtitle packet is received before PCR for the
program has been received, leading to wildly jumping timestamps
on the lavf client side as well as in the re-ordering logic.

This usually happens in case of multiplexes where the PCR of a
program is not taken into account with subtitle tracks' DTS/PTS.
This commit is contained in:
Jan Ekström 2018-12-15 20:50:41 +02:00
parent b97a4b6588
commit a1b4f120c0
1 changed files with 11 additions and 0 deletions
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11
libavformat/mpegts.c
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@ -1219,6 +1219,7 @@ skip:
|| pes->st->codecpar->codec_id == AV_CODEC_ID_DVB_SUBTITLE)
) {
AVProgram *p = NULL;
int pcr_found = 0;
while ((p = av_find_program_from_stream(pes->stream, p, pes->st->index))) {
if (p->pcr_pid != -1 && p->discard != AVDISCARD_ALL) {
MpegTSFilter *f = pes->ts->pids[p->pcr_pid];
@ -1242,6 +1243,7 @@ skip:
// and the pcr error to this packet should be no more than 100 ms.
// TODO: we should interpolate the PCR, not just use the last one
int64_t pcr = f->last_pcr / 300;
pcr_found = 1;
pes->st->pts_wrap_reference = st->pts_wrap_reference;
pes->st->pts_wrap_behavior = st->pts_wrap_behavior;
if (pes->dts == AV_NOPTS_VALUE || pes->dts < pcr) {
@ -1258,6 +1260,15 @@ skip:
}
}
}
if (!pcr_found) {
av_log(pes->stream, AV_LOG_VERBOSE,
"Forcing DTS/PTS to be unset for a "
"non-trustworthy PES packet for PID %d as "
"PCR hasn't been received yet.\n",
pes->pid);
pes->dts = pes->pts = AV_NOPTS_VALUE;
}
}
}
break;