[MPlayer-dev-eng] Re: [MPlayer-DOCS] [PATCH] "quicky" mode (was: complete documentation)

[Guillaume POIRIER]

Hi,
Le mar 14/09/2004 à 12:01, Loren Merritt a écrit :
> On Tue, 14 Sep 2004, Guillaume POIRIER wrote:
> > Any feedbacks welcome
> 
> 1) You might want to enable quicky only if vpass==1 (so that you don't 
> have to remove it when you run the second pass.)

I'm maybe wrong, but that's what it is supposed to do. 
I'm currently not trying to implement any kind of presets.
The user should be clever enough to select only the options he/she wants
for the encoding I guess, for the moment at least.


> 2) I would also disable dia, predia, qprd, and mv0.

I'll add dia, predia, and mv0. Qprd is disabled already, AFAIK.


> On a speed vs quality tradeoff for a normal (fast) encode, I would 
> replace mbd with mbcmp=2 before disabling trellis or subcmp, but I
> haven't tested how much that affects the 2nd pass.

Ok, I'll try that also. My experiments shows that so far, on a small
clip (5min), this new mode doesn't affect PSNR at all.


> 3) I have done something similar (just using different options on each
> pass), but I ran 3 passes: first with almost nothing enabled (30 fps),
> then with most options enabled (6 fps), then with everything (2.5 fps).
> (This required setting both vpass=1 and vpass=2 for the middle pass.)
> The result is about .10 psnr higher than just running 2 passes on slowest,
> and is essentially identical to a full 3 passes on slowest.

Hum... I already heard about people experimenting 3-pass encode, but
haven't experimented it, as 0.1 PSNR looks to me as a small gain VS very
long encoding process.

Here it's not what I'm trying to do, but thanks anyway for your
feedback.

Any other feedback?

Regards,

Guillaume