[mythtv-users] Conversion to DVD

matt hatfield matt at concrete-donkey.us
Mon Nov 3 20:50:38 EST 2003


> Hi,
>
>         I am using MYTHTV successfully with a PVR-350. Occasionally I want
> to
> save
> something to DVD.
>
>         The posting " Re:Burning DVD's from inside the Myth" says :
> (It's just a matter of demuxing, remuxing with
> NAV markers, then dvdauthor, mkisofs, cdrecord.)
>
>         I get the dvdauthor, mkisofs, cdrecord bit, but the best I can do
> is :
>
> 1) Mencoder to convert to mjpeg and WAV.
> mencoder -o OUTPUT_FILE -ofps 30 -ovc lavc -lavcopts
> vcodec=mjpeg:vhq:vqmin=2:vqmax=10 -oac pcm INPUT_FILE
>
> 2) reencode video
> cat OUTPUT_VIDEO | yuvscaler -O SIZE_720x480 | mpeg2enc -F4 -f 8 -q 5 -4 1
> -2
> 1 -P -N -o VIDEO.m2v
>
> 3) reencode audio
> lav2wav  OUTPUT_AUDIO | mp2enc -r 48000 -o AUDIO.mp2
>
> 4) Remultiplex
> mplex -f 8 SOUND.mp2 VIDEO.m2v -o CONVERTED.mpg
>
> Then dvddirgen etc.
>
> I also have to cut the input video up on input to stop audio drift.
>
> This takes a long time (14 hours processing time on a AMD 2100+) and the
> output quality is not very good, loads of artifacts that were not in the
> original video.
>
> I tried using ffmpeg to create the mjpeg to get around using mencoder, but
> yuvscalar did not like it.
>
> Any ideas ?
>
>         Thanks,
>
>                 Stuart
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>
Might not be the exact answer you are looking for, but I have done much
experimenting with this myself. I have come to the conclusion that this is
about the only place that windows has linux beat. I beleive that the files
made by the PVR-350 are the same format as PVR-250. If this is correct you
can use TMPGENC DVD Author to drop the file right onto a DVD no
re-encoding or anything. I couldn't find a linux equivilant no matter how
hard I tried. The total time from start to finish is about 30 - 35 minutes
including burn time. I encode my recordings at 4400 with a 8800 peak 384
audio. The DVD's look great just like I was watching the show. Again I am
not sure if this is what you are looking for but it does work.

Matt


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