[mythtv-users] Audio Sync when exporting to DVD using Nuvexport

[Lane Schwartz]

On Tue, 4 Jan 2005 12:03:56 -0600, Lane Schwartz <dowobeha at gmail.com> wrote:
> On Mon, 03 Jan 2005 16:31:26 +0000, Gary Dawes
> <garydawes at blueyonder.co.uk> wrote:
> > Having finally treat myself to a DVD burner for christmas, I have
> > started exporting shows to DVD, but have found that the audio is ahead
> > of the video by a small amount.
> >
> > I have searched the various wikis, and mailing lists, and have found
> > various posts about this, but while different people have suggested
> > different things, none of them have worked for me, and noone else with
> > the problem has reported that they have solved the problem, and by what
> > method.
> >
> > I'm running knoppmyth, with mythtv 0.16, and the latest versions of
> > transcode mjpegtools available from apt. I'm also running the latest
> > nuvexport (27/12).
> >
> > I've checked my audio recording settings and they are at 48khz
> >
> > I found one snippit of information which suggested running mpeg2desc -m
> > on the .mpg file to determine the audio offset, and then using that
> > information to reencode the file.
> >
> > Any ideas?
> >
> > Thanks
> >
> > Gary
> 
> 
> Gary,
> 
> I've had this issue, too. In fact you probably ran across some of my
> earlier posts in your research.
> 
> The only conclusion that I was able to come to is that there is a bug
> in some ivtv versions which cause the mpeg files that are recorded to
> have some flaw in them. I was always able to play the original
> recordings with no sync issues. It was when I tried the mpg2->mpg2
> cutting that I hit problems. I also hit the same problems with a
> manual edit using avidemux and mplex.
> 
> After spending a good chunk of my Christmas vacation on it, I now have
> a fully functional Myth box again. I can successfully export
> recordings with no audio sync issues.
> 
> While I was debugging, I tried almost everything. I tried multiple
> versions of avidemux, mjpegtools, even multiple versions of the
> kernel. I tried ivtv 0.1.9 and 0.1.10 (100zz, I think). I tried FC2,
> then back to FC1. Nothing worked.
> 
> Why does it work now? Well, I switched back to FC2. Then I used one of
> the new 0.2 ivtv drivers. I think that's what did it. I can now
> successfully export my _new_ recordings.
> 
> However, when I try to export any of the old recordings, I still get
> audio sync issues. This fact makes me even more confident that the
> problem lies in the ivtv driver.
> 
> I know this is a really frustrating problem. Try the new ivtv drivers
> and see if that helps. I think they're in atrpms testing, so make sure
> that's enabled (this is assuming you're running Fedora and using apt).
> 
> If you'd like I can get you the versions of all of the relevant
> programs on my functional box.
> 
> Cheers,
> Lane
> 

I should point out that I'm using a PVR-250 and am in the U.S. 

Lane

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