[mythtv-users] mytharchive and audio sync for HDTV

John Drescher drescherjm at gmail.com
Wed May 2 17:51:11 UTC 2007

On 5/2/07, Patrick Wagstrom <patrick at wagstrom.net> wrote:
> Howdy,
> I've been using MythTV for about 4 years now, but never had a reason to
> try out MythArchive for converting recordings to DVD, at least not until
> yesterday.  First, for background, a little about my setup, where it's
> relevant at least:
> WinTV PVR-250 recording at NTSC 720x480 resolution
> 2x pcHDTV HD-3000 cards recording HDTV
> Running MythTV 0.20 with a few transcoding patches:
>    http://svn.mythtv.org/trac/ticket/2581
>    http://svn.mythtv.org/trac/ticket/2198
> Almost everything is recorded off the HDTV cards now, but there are a
> few channels or programs that I get off the analog card.  After
> recording, I clip the commercials from most every program and then
> re-transcode it to save space.  During this process, I typically halve
> the dimensions for HDTV stuff (1920x1080->960x540).  As a result of
> encoding, however, this really makes the files (960x544).  For SDTV I
> typically just change the resolution to 640x480 and cut the commercials.
> Now, I'm trying to go and archive an HDTV program to DVD using
> MythArchive.  In theory, this should properly scale the image down to
> DVD resolution, maintain the aspect ratio, and all that jazz.  In
> general, it does it quite well.  The video image is just fine.  The
> audio is just fine too.  What is not just fine is the audio/video sync
> up.  The further I get in the DVD the more off the AV sync becomes.

This is not a HDTV issue as I have the same problem and I have only
analog recordings from hauppage pvrs. I get around the problem by
performing the commercial cut via an external program (projectx) but
this adds extra steps in the process.


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