On 5/9/05, Mark Spieth <[EMAIL PROTECTED]> wrote:
>
> here's version 4
> found a bug in avidec.c that calculates duration incorrectly. ffmpeg people
> should probably be notified.
> durations should now be correct.
> may be other bugs but need to sleep now so perhaps some feedback will help
> me continue tomorrow.
> also fixed in this patch is the timestamp wraparound problem which has
> alwasy haunted us.
> basically it subtracts the starttime from the pts/dts values before
> normalization. seems to work with my problem file.
> note dvb wraps every 26hrs approx. 2^33/90000
> still issues with keyframes after seek I think, but Ill attack them
> tomorrow.
> no mpeg2 tested as yet. sorry john.
> cheers
> mark
> _______________________________________________
Hi Mark,
I tried version 4. For my imported AVI files it works pretty well.
Unfortunately, mythfrontend segfaults if I try to play one of my HD
mpeg2 files recorded using my HD-3000 card. Without this patch
applied, those files play just fine.
The segfault happens at line 1571 in libs/libavformat/utils.c:
1555 for(;;) {
1556 if (read_size >= DURATION_MAX_READ_SIZE)
1557 break;
1558 /* if all info is available, we can stop */
1559 for(i = 0;i < ic->nb_streams; i++) {
1560 st = ic->streams[i];
1561 if (st->start_time == AV_NOPTS_VALUE)
1562 break;
1563 }
1564 if (i == ic->nb_streams)
1565 break;
1566
1567 ret = av_read_packet(ic, pkt);
1568 if (ret != 0)
1569 break;
1570 read_size += pkt->size;
1571 st = ic->streams[pkt->stream_index];
1572 if (pkt->pts != AV_NOPTS_VALUE) {
1573 if (st->start_time == AV_NOPTS_VALUE)
1574 st->start_time = av_rescale(pkt->pts,
st->time_base.num * (int64_t)AV_TIME_BASE, st->time_base.den);
1575 }
1576 av_free_packet(pkt);
1577 }
1578
1579 /* we compute the minimum start_time and use it as default */
1580 start_time = MAXINT64;
1581 for(i = 0; i < ic->nb_streams; i++) {
(gdb) print ic
$1 = (AVFormatContext *) 0x82bbcd0
(gdb) print pkt
$2 = (AVPacket *) 0xb10afc70
(gdb) print pkt->stream_index
$3 = 851968
I am guessing that ic->streams does not have 851968 elements in it.
If I can do anything else to help you diagnose this, please let me know.
Thanks,
John
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