[mythtv-users] Transcoding HDTV?

[jack snodgrass]

On 10/3/06, Richard Freeman <r-mythtv at thefreemanclan.net> wrote:
> Ivan Kowalenko wrote:
> >
> >>> - Is it possible to keep the AC3 audio track, or will it be
> >>> converted to
> >>>    MP3?
> >
> > I don't see why not. There ought to be a transcode option for
> > passthrough, otherwise you might have to do a manual user job.
> >
>
> No option exists in myth - I've been looking for it for a while.
>
> This script works well as a user job:
>
> #!/bin/sh
> # Transcode mythtv video down to a reasonable resolution, preserving AC3
> # audio
> nice mencoder /var/video/$1 -o /var/video/$1.tmp -oac copy -ovc xvid -vf
> scale=720:400 -xvidencopts
> bitrate=900:turbo:nochroma_me:notrellis:max_bframes=0:vhq=0 && chown
> mythtv /var/video/$1.tmp && mv /var/video/$1.tmp /var/video/$1
> ERROR=$?
> if [ $ERROR -eq 0 ]; then
>         # Fix the database entry for the file
>         cat << EOF | mysql mythconverg
> UPDATE
>         recorded
> SET
>         filesize = $(ls -l /var/video/$1 | awk '{print $5}')
> WHERE
>         basename = '$1';
> EOF
>
> Bits of this stolen from various sources (including the myth wiki I
> believe).
>
> This will work for h.264 - but right now it is just using xvid.  On
> minimyth the resulting video doesn't play correctly, so I'm not using HD
> right now.  Once minimyth releases 0.20 I'm guessing they'll have fixed
> that bug, and I'll probably record from HD more often (right now that
> tuner is just sitting idle).  If it gets a lot of use I'll be doing a
> LOT of transcoding - hence the speed optimizations I'm using.  If you
> get rid of the speed optimizations you can probably drop the bitrate for
> the same quality.
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>

how fast does this run? It takes me something like an hour to
transcode ( shink )
a 60 minute show....

jack