On Mon, 20 Sep 2004, Derek Fountain wrote:
> I'm using a tuned version of the 3 pass lav2avi.sh script which basically
> does:
The MPlayer/mencoder developers have deprecated (and highly
discourage the use of) the 3 pass method and recommend the use
of the 2 pass method. The lav2avi.sh script hasn't been
updated/rewritten.
> lav2wav ... &
> lav2yuv ... | mencoder ...
> lav2yuv ... | mencoder ...vpass=1...
> lav2yuv ... | mencoder ...vpass=2...
>
> I wanted to put a denoise step in there. The options seem to be,
> 1) stick a denoise on each lav2yuv step and do the denoise 3 times
That'd work but the first pass is primarily audio encoding and
frame counting so it's not necessary to put a denoising (or any other
video filtering) step in the first pass.
> 2) stick a denoise on the last lav2yuv step and hope it doesn't screw the 2
> video passes too much
That also would work fine and would be a lot faster than denoising
3 times.
> 3) make a separate (and enormous) yuv file
That's what I've done at times when I'm going to be making multiple
encodings (varying the video bitrate, etc).
> 4) denoise and put the resultant yuv through yuv2lav to get back to a sensible
> file I can put into mencoder 3 times.
> (4) seems the most reasonable idea. Is that right, or did I miss something
> more obvious?
It sounds like (4) is a variation of (3) - creating a denoised yuv
file that gets put thru mencoder multiple times.
5) Skip the multi-pass method completely and just do it in one pass.
I've never found the improvement between the 1 and 2 pass methods
to be visibly impressive. Just calculate a bitrate based on the
desired size and elapsed time and use that value for the 'vbitrate'.
6) Use the hqdn3d denoising filter in mencoder. I don't think it's as
effective as yuvdenoise but it might well be "good enough" for your needs.
Good Luck!
Cheers,
Steven Schultz
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