Antw: Re: Antw: Re: [MPlayer-users] (no subject)

[Nick]

On Wednesday 27 October 2004 21:00, Loren Merritt wrote:
> Yes. DVDs often contain lots of noise (or film grain, whatever you want to
> call it.) Noise looks bad to begin with, and compresses poorly.
>
> The optimal parameters depend on how much noise is actually in your
> source. The defaults (4:3:6:4.5) are a bit strong, but may be needed for
> some DVDs.
>
> --Loren Merritt

Oke I've encoded Hero with the following commandline:

mencoder -dvd-device ~/movies/dvd/Hero/ dvd://2 -oac copy -vf 
crop=720:432:0:72,hqdn3d=4:3:6 -ovc lavc -lavcopts 
vcodec=mpeg4:vqscale=2:vhq:autoaspect 
-o /home/nick/movies/encode/Hero_vqscale.avi

Results of the encode where I used vqscale:

Playing Hero_vqscale.avi.
AVI file format detected.
AVI: ODML: Building odml index (2 superindexchunks)
VIDEO:  [DIVX]  720x432  24bpp  25.000 fps  3466.8 kbps (423.2 kbyte/s)
Clip info:
Software: MEncoder 1.0pre5-3.3.4

Results of the encode where I used the 2-passes method and 9999 bitrate:

Playing Hero.avi.
AVI file format detected.
AVI: ODML: Building odml index (2 superindexchunks)
VIDEO:  [DIVX]  720x432  24bpp  25.000 fps  5310.8 kbps (648.3 kbyte/s)
Clip info:
Software: MEncoder 1.0pre5-3.3.4

The weird thing here is that when using vqscale the bitrate and filesize 
aren't larger than using the 2-passes method.

2-passes size = 3.9 GB
vqscale size = 2.6 GB

Could someone explain this please?

Regards,
Nick