[vdr] Re: Transcoding to mpeg2

["Nigel Magnay" <nigel.magnay@activiti.com>]

Ta - I'd looked at that, and also using mplayer directly. My problem was

that I couldn't persuade mplayer to output in a compressed format - my 
MediaMVP box doesn't seem to like uncompressed audio streams (or maybe
the audio bitrate is too high). 

I'd figured if a 933Mhz C3 was about 35% of the required performance
then
A 3Ghz P4 ought to be able to cope. 

One thing I don't know is whether there is a difference between
Mplayer with a -vop mpegpes
And mencoder with -ovc lavc -lavcopts vcodec=mpeg2video..

 

-->-----Original Message-----
-->From: vdr-bounce@linuxtv.org [mailto:vdr-bounce@linuxtv.org] 
-->On Behalf Of Patrick Cernko
-->Sent: 18 March 2004 17:52
-->To: vdr@linuxtv.org
-->Subject: [vdr] Re: Transcoding to mpeg2
-->
-->Hi Nigel,
-->
-->Also sprach Nigel Magnay zu "18.03.2004 16:10" Anno Domini:
-->> I'm guessing there may be a few people on this list that are doing 
-->> transcoding to mpeg2 in order to view non mp2 videos with VDR.
-->>  
-->> I'm currently using a line of
-->>  
-->> mencoder -o bb2.mpeg -of mpeg -ovc lavc -lavcopts 
-->> vcodec=mpeg2video:vbitrate=5000 -vop scale=720:576 -oac lavc bb.avi
-->>  
-->> To do my transcoding. This works fine, but on my 933Mhz C3 I get a 
-->> glorious convesion rate of about 9fps. I kinda expected 
-->this because 
-->> the C3 isn't the fastest machine in the world and MPEG2 is 
-->known to be 
-->> quite expensive.
-->>  
-->> So - are there any good 'options' I can pass to mencoder 
-->that people 
-->> have discovered - notably, I don't care about the output file size 
-->> particularly, my high value for vbitrate= was to try and 
-->save it some 
-->> time in compressing.
-->>  
-->> I'm probably going to buy a 3Ghz P4 or something to act as my 
-->> transcoding box - does anyone know if that should be sufficient ?
-->>  
-->
-->If you only want to what the material once you can use the 
-->mplayer plugin together with Juri's fine mplayer.sh script. 
-->There you can get realtime transcoding directly to your DVB 
-->device with scaleable performance/quality. My 866MHz 
-->P3-Notebook is fast enough to transcode at a output 
-->resolution of about 700x576 and I only expirence very very 
-->seldom stuttering at very high motion scenes.
-->
-->Maybe the mplayer.sh from Juri can provide you some hints 
-->how to do fast non-realtime transcoding (to mpeg1!) too.
-->
-->You can find them here:
-->
-->mplayer plugin: http://www.muempf.de/
-->mplyer.sh script: http://batleth.sapienti-sat.org/projects/VDR/
-->
-->CU
-->--
-->Patrick Cernko | mailto:errror@errror.de | 
-->http://www.errror.de Quote of the Week: "Quis custodit custodes?
-->                     Ceterum censeo Microsoftem esse delendam!"
-->                    (anonyum)
-->


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