[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.
John
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