Originally, the avcodec_open2() at the start of avformat_find_stream_info
didn't work, since there was no extradata. Therefore, has_b_frames
was 0 and delay was 0 in compute_pkt_fields, and
update_initial_timestamps was called.
If the mov demuxer sets the extradata, the early avcodec_open2()
succeeds, setting has_b_frames == 1, making compute_pkt_fields
not call update_initial_timestamps at all (since delay was 1,
due to has_b_frames).
---
libavformat/utils.c | 3 ++-
1 files changed, 2 insertions(+), 1 deletions(-)
diff --git a/libavformat/utils.c b/libavformat/utils.c
index 4145097..436470f 100644
--- a/libavformat/utils.c
+++ b/libavformat/utils.c
@@ -976,7 +976,8 @@ static void compute_pkt_fields(AVFormatContext *s, AVStream
*st,
FFSWAP(int64_t, st->pts_buffer[i], st->pts_buffer[i+1]);
if(pkt->dts == AV_NOPTS_VALUE)
pkt->dts= st->pts_buffer[0];
- if(st->codec->codec_id == CODEC_ID_H264){ // we skipped it above so we
try here
+ if (st->codec->codec_id == CODEC_ID_H264 ||
+ (st->codec->codec_id == CODEC_ID_VC1 && delay)) { // we skipped it
above so we try here
update_initial_timestamps(s, pkt->stream_index, pkt->dts,
pkt->pts); // this should happen on the first packet
}
if(pkt->dts > st->cur_dts)
--
1.7.3.1
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