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avformat/av1dec: Flush BSF upon seeking

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The av1_merge_frame BSF outputs its cached data when it sees the
beginning of a new frame, i.e. when it sees a temporal delimiter OBU.
Therefore it typically has a temporal delimiter OBU cached after
outputting a packet.

This implies that the OBU demuxer must flush its BSF upon seeking
because otherwise the first frame returned after a seek consists
of an old temporal delimiter OBU only.

Reviewed-by: James Almer <jamrial@gmail.com>
Signed-off-by: Andreas Rheinhardt <andreas.rheinhardt@outlook.com>
This commit is contained in:
Andreas Rheinhardt 2021-08-22 11:18:56 +02:00
parent 4d200342a7
commit 3f938cd46a
1 changed files with 4 additions and 0 deletions
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4
libavformat/av1dec.c
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@ -390,6 +390,10 @@ static int obu_read_packet(AVFormatContext *s, AVPacket *pkt)
AV1DemuxContext *const c = s->priv_data;
int ret;
if (s->io_repositioned) {
av_bsf_flush(c->bsf);
s->io_repositioned = 0;
}
while (1) {
ret = obu_get_packet(s, pkt);
/* In case of AVERROR_EOF we need to flush the BSF. Conveniently