ffmpeg: copy b frame codec delay back from decoder to demuxer

The demuxer needs this value to generate correct timestamps in some corner cases
Ideally the parser would always set this correctly, but some parsers lac support
for extracting this value, also its not trivial.
This fixes a regression

Signed-off-by: Michael Niedermayer <michaelni@gmx.at>

1 files changed, 1 insertions, 0 deletions

diff --git a/ffmpeg.c b/ffmpeg.c
index 8c1faea7f5..f667bd8c7b 100644
--- a/ffmpeg.c
+++ b/ffmpeg.c
@@ -1856,6 +1856,7 @@ static int decode_video(InputStream *ist, AVPacket *pkt, int *got_output)
     ret = avcodec_decode_video2(ist->dec_ctx,
                                 decoded_frame, got_output, pkt);
     update_benchmark("decode_video %d.%d", ist->file_index, ist->st->index);
+    ist->st->codec->has_b_frames = ist->dec_ctx->has_b_frames;
 
     if (*got_output || ret<0 || pkt->size)
         decode_error_stat[ret<0] ++;