[vdr] Re: AW: dynamic range compression

[Andreas Schultz <aschultz+vdr@warp10.net>]

Bläser, Lars wrote:
 >> Von: a.schinkel@vosschemie.de [mailto:a.schinkel@vosschemie.de]
 >> Gesendet am: Montag, 21. Oktober 2002 14:42 An: vdr@linuxtv.org
 >> Betreff: [vdr] dynamic range compression
 >>
 >> hi people,
 >>
 >> i asked this a few times in the past, is there a way to do some
 >> dynamic compression to watch high dynamic movies in the night
 >> without waking up everyone?
 >
 >
 > 1. connect your vdr audio-out to your receiver witch should have that
 > mode (if it´s a good one)
 > 2. write a plugin for the new 1.1.x version  ;-)
 >
 > imho the problem is that the audio and video stream comes compressed
 > from the provider (MPEG1-II and MPEG2) and vdr pumps it without
 > changes on the compression to the dvb-s, to create that mode you will
 > have to decompress the audio stream, make your modifications and
 > recompress it - all realtime - that will be a good amount of load to
 > your cpu

There is no need to recompress it, sending it as PCM data to the card 
should work just fine. Decompressing should not be to difficult too. The 
dxr3 plugin is already doing it and it seems not to take that much cpu 
power. Or take the AC3 stuff (liba52) in the DVD plugin for example, it 
decompresses AC3 and can do dynamic range compression. And all this 
still works one a 166MHz Pentium and probably also on slower systems.

The only thing you have to be carefull with is to not screw a/v sync in 
the process.

Andreas



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