Handle 0-size sync packets when only parsing headers.

Currently, the duration of those packets is just discarded when enabling parsing, thus the output of the Metal Gear Solid demuxer breaks completely when just setting AVSTREAM_PARSE_HEADERS. The result will not be correct if a parser creates a delay even with PARSER_FLAG_COMPLETE_FRAMES and there might be other cases where it does not work correct, but just discarding them as it is done currently seems worse. Signed-off-by: Reimar Döffinger <[email protected]>
zhengxj91 · Mar 26, 2012 · 699c61d · 699c61d
1 parent fca62f0
commit 699c61d
Showing 1 changed file with 3 additions and 0 deletions.
diff --git a/libavformat/utils.c b/libavformat/utils.c
@@ -1133,6 +1133,9 @@ static int parse_packet(AVFormatContext *s, AVPacket *pkt, int stream_index)
  av_init_packet(&flush_pkt);
  pkt = &flush_pkt;
  got_output = 1;
+ } else if (!size && st->parser->flags & PARSER_FLAG_COMPLETE_FRAMES) {
+ // preserve 0-size sync packets
+ compute_pkt_fields(s, st, st->parser, pkt);
  }
 
  while (size > 0 || (pkt == &flush_pkt && got_output)) {