[vdr] Re: AW: dynamic range compression

["Rienecker, Fa. Evenio, ITS P, M" <C.Rienecker@deutschepost.de>]

> -----Original Message-----
> From: Steffen Koch [mailto:Steffen.Koch@sphinx-electronics.de]
> Sent: Monday, October 21, 2002 4:48 PM
> To: vdr@linuxtv.org
> Subject: [vdr] Re: AW: dynamic range compression
> 
> 
> Bläser, Lars wrote:
>  >> 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?
>  >
>  > 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
> 
> This has nothing to do with file-compression but with dynamic 
> compression, limiting the volume of a audio-stream to a certain level.

Well, sort of.
It lowers the level of high volume sections (e.g. explosions) and raises the level of low volume sections (e.g. actor whispering).
A lot of FM-stations are doing this. It's especially usefull for car-audio users.

CU,
Christian.


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