[mythtv-users] Audio/Video Sync

Nasa nasa01 at comcast.net
Thu Feb 18 18:18:10 UTC 2010


----- "John Drescher" <drescherjm at gmail.com> wrote:

> On Thu, Feb 18, 2010 at 6:26 AM, Nasa <nasa01 at comcast.net> wrote:
> >
> > ----- "John Drescher" <drescherjm at gmail.com> wrote:
> >
> >> On Wed, Feb 17, 2010 at 12:20 PM, Nasa <nasa01 at comcast.net> wrote:
> >> > Hi,
> >> >
> >> > I have been having this long standing issue with a number of
> >> recorded and/or ripped videos, specifically that of being out of
> audio
> >> sync.  Using a basic research tool, ie GOOGLE, I noted
> >> > that there are a number of reported audio/video sync problems
> >> floating around.
> >> >
> >> > http://www.gossamer-threads.com/lists/mythtv/users/419411
> >> > http://www.gossamer-threads.com/lists/mythtv/users/421296
> >> >
> >>
> http://www.mythtv.org/pipermail/mythtv-users/2009-December/275546.html
> >> >
> >>
> http://www.mythtvtalk.com/forum/general/12390-livetv-audio-sync.html
> >> > http://forum.xbmc.org/showthread.php?t=69987
> >> >
> >> >
> >> > However, I didn't note a clear see any clear solutions to the
> >> problem.  Is there a HOWTO
> >> > or WIKI that would give us a chance at troubleshooting it?  Is
> it
> >> something that should
> >> > be reported on trac (I do use SVN)?
> >> >
> >> > Any guidance would be appreciated.
> >> >
> >>
> >> Are you using projectx to cut your videos? If not enable that
> because
> >> it will fix a lot of these problems.
> >
> > Thanks for the reply,
> >
> > Isn't projectx for DVB streams?  Since I am in the US -- don't think
> it
> > will help me out, but let me know if I am not understanding
> something.
> >
> 
> I am in the US also. Its not just for DVB streams. It replaces
> mythtranscode in mythtv cutting out commercials when you use
> mytharchive. A few years ago I wrote a script to replace
> mythtrasncode
> to precut the recordings and make mythtv use my cut recordings. Back
> then I found that mythtranscode can cause an AV sync problems if you
> do not cut on keyframes. For most of the last 2 years I have moved to
> using the projectx option in mytharchive and not precutting my videos
> in myth. I see that you said recordings and ripped videos in mythtv
> so
> you are not talking about
> 
> That script is here:
> 
> http://github.com/drescherjm/jmdgentoooverlay/blob/master/Other/shell-scripts/mythtv/pxcut.sh
> 
> Its a little rough and needs to be worked to fit any other machine
> since it assumes the db is on jmd1..
> 
> USAGE pxcut.sh <filename.mpg> [-d] [-h]
> 
> John
John,

Thanks for sharing -- this is good stuff.  As you surmised, I am not at your level.  I am having
these A/V sync issues with things like livetv, recorded channels (recorded via firewire), and 
ripped blu-ray flicks.  But, I can see how your script could be useful!

Nasa

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