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initial dts fix

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Originally committed as revision 3555 to svn://svn.ffmpeg.org/ffmpeg/trunk
This commit is contained in:
Michael Niedermayer 2004-10-03 12:58:14 +00:00
parent 2031ba1bf2
commit e0c91bc23b
3 changed files with 3 additions and 16 deletions
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13
libavformat/mpeg.c
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@ -1016,19 +1016,6 @@ static int mpeg_mux_write_packet(AVFormatContext *ctx, AVPacket *pkt)
pts= pkt->pts;
dts= pkt->dts;
if(s->is_svcd) {
/* offset pts and dts slightly into the future to be able
to do the compatibility fix below.*/
pts += 2;
dts += 2;
if (stream->packet_number == 0 && dts == pts)
/* For the very first packet we want to force the DTS to be included.
This increases compatibility with lots of DVD players.
Since the MPEG-2 standard mandates that DTS is only written when
it is different from PTS we have to move it slightly into the past.*/
dts -= 2;
}
if(s->is_vcd) {
/* We have to offset the PTS, so that it is consistent with the SCR.
SCR starts at 36000, but the first two packs contain only padding

4
libavformat/utils.c
View File

@ -1979,8 +1979,8 @@ static void compute_pkt_fields2(AVStream *st, AVPacket *pkt){
static void truncate_ts(AVStream *st, AVPacket *pkt){
int64_t pts_mask = (2LL << (st->pts_wrap_bits-1)) - 1;
if(pkt->dts < 0)
pkt->dts= 0; //this happens for low_delay=0 and b frames, FIXME, needs further invstigation about what we should do here
// if(pkt->dts < 0)
// pkt->dts= 0; //this happens for low_delay=0 and b frames, FIXME, needs further invstigation about what we should do here
pkt->pts &= pts_mask;
pkt->dts &= pts_mask;

2
tests/libav.regression.ref
View File

@ -7,7 +7,7 @@ ffmpeg regression test
./data/b-libav.asf CRC=750f18c7
1cbf838e659d7fc3d3e33f4187b91f6c *./data/b-libav.rm
360251 ./data/b-libav.rm
65af12e9d9e8eb76af5efdadf769d7d7 *./data/b-libav.mpg
7aeebe6bf43c0c1219e41ce082a47051 *./data/b-libav.mpg
387072 ./data/b-libav.mpg
./data/b-libav.mpg CRC=16c74225
57a8dfc7926802bb337a9d8918de94a8 *./data/b-libav.swf