Date: Thu, 29 Sep 2005 21:59:15 -0400 From: "Douglas Berry" <doug@bitnix.ca> To: freebsd-multimedia@freebsd.org Subject: Re: fast transcoding of pvr-250 created files Message-ID: <200509300159.j8U1xFIv005147@monk.cnd.dundas.on.ca> In-Reply-To: Your message of "Thu, 29 Sep 2005 15:59:26 EDT." <6.2.3.4.0.20050929155647.03113e40@64.7.153.2>
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mike@sentex.net 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
^c
$ 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.
cheers,
doug
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