[mythtv-users] MPEG streams from certain channels don't play properly (#3773)

Yeechang Lee ylee at pobox.com
Thu Feb 7 02:24:07 UTC 2008


Curtis Stanford <curtis at stanfordcomputing.com> wrote on ticket #3773:
> For the last few weeks, SVN version has not been playing MPEG
> streams from my SD movie channel correctly. The video plays too fast
> and the audio skips and doesn't sync with the video. It seems to
> play OK until I jump forward or back and then it goes all to hell.
> 
> I'm capturing MPEG using firewire on a Motorola 6200 HD receiver. HD
> programming is OK. My playback settings include Bob deinterlacing
> and Nvidia XvMC output.

This sounds like an issue I ran into starting in September 2007 on my
two DCT6200s
(<URL:http://www.gossamer-threads.com/lists/mythtv/users/301351#301351>)
after 21 months without the problem. Commonalities are SD channels,
audio/video speed issues, Bob, HD channels are fine, FireWire. I'm
pretty sure a firmware upgrade that month is to blame.

A few other symptoms I've noticed about the problem that I'll bet
Curtis' setup also exhibits:

* SD digital channels are fine. So it's not SD versus HD, per se; it's
  SD analog.
* The OSD shimmers during playback of recordings from the affected
  channels. Turning Bob off fixes this issue (but nothing else, of
  course).
* Recordings will inevitably stop, sometimes after a minute, sometimes
  after several minutes. Once the connection dies, manually changing
  the channel (either via the remote or '6200ch'), then
  'firewire_tester -R', is necessary in order to reawaken FireWire
  connectivity.

Unfortunately I don't have a solution to this issue. Other than TCM
and Cartoon Network I don't miss the analog channels, but it's still
annoying having to mark all <100 channels as invisible until this
issue is fixed somehow. Hopefully Curtis' ticket will get us to that
goal.

By the way, it's quite possible #2813 is related. After filing that
ticket I realized that the reason only some of my analog recordings
were being affected was that only one of my two boxes at the time
produced SD analog-over-FireWire feeds that resulted in problematic
recordings. It took about a half-dozen swapouts before the cable
company was able to give me a replacement DCT6200 without the
issue. One difference with #2813 is that, unlike the current issue,
recordings were always complete.

-- 
Yeechang Lee <ylee at pobox.com> | San Francisco CA US


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