[mythtv-users] A/V diverged by -3 frames

Christian Hack christianh at edmi.com.au
Wed Jan 5 00:38:58 EST 2005


(top posting...)

I found that Isaac merged some libavcodec/ffmpeg stuff in about the 24th
December 04. I went back to just before that and it's working fine at the
moment. I haven't had time to narrow it down any further, but if you take
CVS from say 26th it should be bad and from the 23rd it should be good (to
counter timezone issues, not sure how CVS works in that respect)

As far as I am aware no one has attempted to fix it. I guess there are only
a few Australian CVS users?

One slightly interesting thing is that it appears on my one and only UHF
channel only. All VHF channels are fine.

You describe WIN, SBS and PRIME which suggests you are in a regional area.
They are usually UHF right? Are your ABC and 10 VHF?

Don't know how that could possibly make a difference to the MPEG2 stream,
but it's an interesting occurrence.

> -----Original Message-----
> From: mythtv-users-bounces at mythtv.org 
> [mailto:mythtv-users-bounces at mythtv.org] On Behalf Of David Collett
> Sent: Wednesday, 5 January 2005 2:21 PM
> To: Discussion about mythtv
> Subject: Re: [mythtv-users] A/V diverged by -3 frames
> 
> 
> I've just updated my cvs (today) and have this problem on SBS, WIN(9)
> and PRIME(7). ABC and 10 seem to be ok. I also see the issue with
> previously recorded programs from those affected channels, but not the
> unaffected ones. I am seeing simillar log entries to you.
> 
> Please let me know if you have found any solutions or have identified
> the date at which the bug was introduced.
> 
> Thanks,
> Dave
> 
> 
> On Tue, 28 Dec 2004 23:36:52 +1000, Christian Hack
> <christianh at edmi.com.au> wrote:
> > > -----Original Message-----
> > > From: mythtv-users-bounces at mythtv.org
> > > [mailto:mythtv-users-bounces at mythtv.org] On Behalf Of 
> Hamish Moffatt
> > >
> > > On Tue, Dec 28, 2004 at 08:40:10AM +1000, Christian Hack wrote:
> > > > Same deal although 50Hz +  realtime has made my tickers and
> > > panning etc go
> > > > much smoother. Don't know why I didn't try that before.
> > > Thanks for the
> > > > suggestion.
> > > >
> > > > It's just the one channel, and it appears that once
> > > transcoded to MPEG4 they
> > > > play fine. So it's something to do with the MPEG2 from the
> > > DVB card. I can
> > > > host a stream of it if someone wants to look. It's
> > > obviously very big though
> > > > and I only have 128kb/s upstream.
> > >
> > > I've used SBS with Myth occasionally (though not in the last
> > > two weeks)
> > > and haven't had any issues like this.
> > >
> > > > 2004-12-28 08:39:43.531 Video timing method: RTC
> > > > 2004-12-28 08:39:43.532 Refresh rate: 19999, frame 
> interval: 40000
> > >
> > > This might still be a problem occasionally.
> > 
> > Yep I realise that - I think there might be some rounding 
> errors there.
> > Definitely not the problem though this time I believe If 
> that's what's
> > really the "frame rate" the error is 0.005% or about 1 
> frame in 20000 (every
> > 400 seconds).
> > 
> > This is much more severe than that. If you are running 
> latest CVS, can you
> > try and run mythfrontend with -v libav,playback options 
> watching SBS?
> > 
> > This is new since I upgraded to CVS. SBS previously worked 
> fine. Also old
> > DVB recordings which previously worked fine are now showing the bad
> > playback. I'm currently trying to work out when it went bad 
> but it takes so
> > long to compile it's taking me a while to track down.
> > 
> > CH
> > 
> > 
> > _______________________________________________
> > mythtv-users mailing list
> > mythtv-users at mythtv.org
> > http://mythtv.org/cgi-bin/mailman/listinfo/mythtv-users
> > 
> > 
> >
> 




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