[mythtv] AddAudioData passed incorrect timecode causes stutter after skip
mythtv
mythtv at modified.cc
Fri Aug 15 22:26:33 UTC 2008
Hi DEV's,
I'm currently running trunk Revision: 18108 (although I've had this
problem since using mythtv for HD content) and am experiencing audio and
video stutter on a certain HD channel. I am in a PAL area (Australia).
When a skip is performed the timecode passed to
NuppelVideoPlayer::AddAudioData by avformatdecoder is reset to 0 and
starts counting up. This is caused by pkt->pts resetting to 0 and
counting up. This causes A/V Divergence to report massively high
values. This stutter continues until the timecode is "magically"
returned to normal values. The behavior is only bad on one HD channel
(running 1440x1080) and cannot be replicated on another HD channel
(running 1280x720). It can be replicated on a SD channel, but only
occasionally occurs and corrects itself so quickly that it is very
difficult to see.
The following code at the end of NuppelVideoPlayer::WarpFactor works
around the problem at the expense of extended lip sync issues.
if ((divergence > DIVERGELIMIT) || (divergence < -DIVERGELIMIT)) {
divergence = MAXDIVERGE;
}
return divergence;
At this point I've run out of talent and cannot determine:
a. if pkt->pts is reporting 0 correctly (e.g. if it only gets set to an
absolute value on a keyframe) ; or
b. if the code that determines this value has a bug (or indeed which bit
of the code sets the value...).
If someone can point me in the right direction it would be greatly
appreciated.
Thanks,
Lyall
HD Prime
2008-08-16 07:39:02.569 A/V timecodes audio 11194847 video 11194987
frameinterval 40000 avdel 140 avg 35000 tcoffset 0
2008-08-16 07:39:02.927 A/V timecodes audio 130 video 11225107
frameinterval 40000 avdel 11224977 avg 35000 tcoffset 0
[snip 112 lines]
2008-08-16 07:39:07.420 A/V timecodes audio 4621 video 11229547
frameinterval 40000 avdel 11224926 avg -414994222 tcoffset 0
2008-08-16 07:39:07.460 A/V timecodes audio 11229338 video 11229587
frameinterval 40000 avdel 249 avg -414993972 tcoffset 0
HD WIN
[no errors]
SD ABC
2008-08-16 07:40:59.139 A/V timecodes audio 2580086 video 2580304
frameinterval 40000 avdel 218 avg 54250 tcoffset 0
2008-08-16 07:40:59.339 A/V timecodes audio 10 video 3180464
frameinterval 40000 avdel 3180454 avg 54500 tcoffset 0
[snip 3 lines]
2008-08-16 07:40:59.498 A/V timecodes audio 170 video 3180624
frameinterval 40000 avdel 3180454 avg -278628074 tcoffset 0
2008-08-16 07:40:59.538 A/V timecodes audio 3180325 video 3180664
frameinterval 40000 avdel 339 avg -278628324 tcoffset 0
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