[mythtv-users] mencoder and re-encoding HDTV shows.

Paul Mason latepaul at gmail.com
Tue Sep 18 16:16:22 UTC 2007

On 18/09/2007, jack snodgrass <mrlinuxgroups at gmail.com> wrote:
> I'm using this mencoder command to re-encode a HDTV show to something
> smaller... something
> I can stream to my office over the internet or something I can put on
> a usb drive....
> mencoder -srate 22050 -vf scale=720:400 -oac mp3lame -lameopts
> preset=15:mode=3 -ovc lavc -lavcopts vcodec=mpeg4:vbitrate=900 -sws 2
> -o /tmp/1005_20070914190000_720x400x900.avi
> /mnt/store/1005_20070914190000.mpg
> This command takes 22 minutes or so to re-encode a 30 minute, 4GB HDTV
> show down to
> 101Meg at a reasonable quality ( compared to the original HD stream ).
> 22 minutes seems a bit excessive to me for a 30 minute show.... this
> is on a E6600 Core Duo.
> It takes 2-3 more minutes to do this same command on a AMD x86_64
> 3800+ box... quite
> a bit slower than the E6600 box.

I was thinking 22 minutes was quite impressive. My AMD 3800+ (non-dual) box
was taking ~80mins to convert a 2Gb, 45min DVD ripped VOB file to h264.
That's with an IVTC filter and then resize (720:480 -> 512:384). That was
before I decided that it was a background task anyway and so I'd do a
two-pass transcode which is now taking 2h15m per file.

I'm using avidemux2_cli. I'd heard mencoder was quicker but I didn't think
it was that much quicker. I might have a go with mencoder tonight.

Paul Mason
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