[mythtv] [PATCH] Workaround for hangs when ffwd/rewinding video
Matt Holgate
matt-bulk-mythtv at holgate.org.uk
Wed Sep 20 19:58:44 UTC 2006
Hi,
I'm running myth-0.20-fixes on a VIA EPIA M10000 box, and I get
regularly get hangs while fast forwarding/rewinding videos (live tv or
recorded).
It seems to happen when seeking then resuming playback. In the logs I
get loads of messages like:
2006-09-20 20:40:27.917 Waited too long for video out to pause
I've seen other people point out this issue too. Tracing it back, it
seems to be getting stuck in PauseVideo():
#0 0xb5df3440 in pthread_cond_timedwait@@GLIBC_2.3.2 () from
/lib/tls/libpthread.so.0
#1 0xb64e04e0 in QWaitCondition::wait () from /usr/lib/libqt-mt.so.3
#2 0xb792fcba in NuppelVideoPlayer::PauseVideo (this=0x8f32db0, wait=true)
at NuppelVideoPlayer.cpp:456
#3 0xb7943448 in NuppelVideoPlayer::StartPlaying (this=0x8f32db0)
at NuppelVideoPlayer.cpp:3317
#4 0xb78deedf in SpawnDecode (param=0x8f32db0) at tv_play.cpp:256
#5 0xb5df0b63 in start_thread () from /lib/tls/libpthread.so.0
#6 0xb5ca918a in clone () from /lib/tls/libc.so.6
I think what is happening is that the seeking operation is trying to
pause the video:
if (fftime >= 5)
{
PauseVideo();
but there is a race between PauseVideo() setting the pausevideo member
to true:
void NuppelVideoPlayer::PauseVideo(bool wait)
{
video_actually_paused = false;
pausevideo = true;
and the user pressing 'play' causing pausevideo to become false in
UnpauseVideo()
void NuppelVideoPlayer::UnpauseVideo(void)
{
pausevideo = false;
}
I think this is causing PauseVideo to get stuck in an infinite loop will
trying to seek.
I've attached a patch which works around this, but I've no idea if it's
the correct thing to do. If you think it seems sensible, I'll open a
ticket and submit it properly. Feedback please :)
thanks a lot,
Matt.
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