[MPlayer-users] RFC: docs update for "how to create a high quality DVD rip"

[Wayde Milas]

On Thu, 2004-06-10 at 11:11, Matthias Wieser wrote:
> Wayde Milas wrote:
> 
> > Here is the truth. 384k Ac3 5.1 is already compressed all to hell.
> > Seriously. This is what happens: They take a master of say 6 channels
> > (this isnt quite right because some of the channels arent full bitrate,
> > but its close enough to get a good idea) of 24 bit sound. The sampling
> > rate is usually 48khz. This is compared to CD which is 2 channels of 16
> > bit at 44.1khz.
> 
> Here is the truth. MPEG-2  is already compressed all to hell.
> Seriously. This is what happens: They take a master of say 2000x800 pixel
> (this isnt quite right because I dont' know the exact resolution of the 
> master, but its close enough to get a good idea) of 24 bit video. The 
> sampling
> rate is usually 24hz. This is compared to MPEG2 which is 720x576 at 4:2:0 
> sampling.
> 
> > Ok so you got 6*24*48000 = 6912000 bits per second. Now they take this
> > monster stream, and compress it down to 384k - 384*1024 = 393216. See
> > the huge amount thats already thrown out?
> 
> Ok so you got 2000*800*24bit*24fps = 921 600 000 bits per second. Now they 
> take this
> monster stream, and compress it down to 6M  - 6*1024*1024 = 6 291 456. See
> the huge amount thats already thrown out?

Er.. I'm not sure what to make of this. Video != audio. Video degrades
in a totally different manner than audio.

I'm not quite sure what you are aiming at here, besides thats both are
already transcoded.