fast transcoding of pvr-250 created files

Douglas Berry doug at
Thu Sep 29 18:59:17 PDT 2005

mike at said:
> I just got my pvr250 up and running again and was wondering what
> people use for fast and efficient transcoding ?  The native format
> is  quite large and I want to convert the file into xvid or divx for
>  later viewing, but I dont want to reduce the quality too  much.
> Anyone doing anything similar, and if so what program are you  using
> with what options ?

It looks like you are recording full D1, I've been using
half D1....

$ /usr/local/bin/pvr250-setchannel -t -m 1 -g  352x480 2
$ /bin/dd if=/dev/cxm0 of=tvo.mpeg bs=1m
$ tcprobe -i tvo.mpeg
[tcprobe] MPEG program stream (PS)
[tcprobe] summary for tvo.mpeg, (*) = not default, 0 = not detected
import frame size: -g 352x480 [720x576] (*)
     aspect ratio: 4:3 (*)
       frame rate: -f 29.970 [25.000] frc=4 (*)
                   PTS=0.4004, frame_time=33 ms, bitrate=4520 kbps
      audio track: -a 0 [0] -e 48000,16,2 [48000,16,2] -n 0x50 [0x2000] (*)
                   PTS=0.2894, bitrate=384 kbps
                   -D 3 --av_fine_ms 10 (frames & ms) [0] [0]

This yields ~4.2GB/hour, far from perfect, yet we don't mind the
degradation for our purposes.


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