[MEncoder-users] real-time encoding of DVB-S @ 900 MHz

[Moritz Beller]

On Sun, 26 Jun 2005 12:10:08 +0200
Reimar Döffinger <Reimar.Doeffinger at stud.uni-karlsruhe.de> wrote:

> You of course can't expect
> to get perfect quality, small files and realtime encode together...

Very well said.

I experimented the whole day through now and went for these solutions: 

DVB: RECORDING

(1) sudo nice --10 mencoder "dvb://Das Erste"
-o Take.avi -oac copy -ovc lavc -lavcopts vcodec=mpeg2video -vf
scale=467:350

Makes small, VCD-ready files in reasonably good quality (~7.2MB/M)

(2) sudo nice --10 mencoder "dvb://Das Erste" -o test1-mp3.avi  -oac
mp3lame -lameopts mode=0:cbr:aq=3 -ovc lavc -lavcopts vcodec=mpeg2video
-vf scale=384:288

Outputs small, VCD-ready files in acceptable quality, decreasing
the filesize even further by encoding the audiostream to MP3 (~7MB/M)

(3) sudo nice --10 mencoder dvb://Das Erste -oac mp3lame -lameopts
mode=0:cbr:aq=3 -ovc lavc -lavcopts vcodec=mpeg4:vqscale=2:keyint=1
-vf scale=384:288 -o test.avi 

Produces high-quality, yet very big files (~40MB/M)

You'll probably want (1) and (2) for every day usage. (3) is needed in
such cases when you want to go for very good quality, but leaving the
deinterlacing out (directly copying the MPEG2-stream would need this).

regards,
Moritz
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