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Re: Re: Space saving tips: msg#00250

video.ffmpeg.user

Subject: Re: Re: Space saving tips


Le 29 avr. 06 à 00:03, T a écrit :

On Fri, 28 Apr 2006 11:27:23 +0200, herve.flores wrote:

You force the output to be CBR at thrice the input bit rate. Seems
normal that you get a file thrice as big.

use VBR and DO NOT REDUCE THE BITRATE (...do you want some "buffer
underflow"? ;-))))
-b 9000 -maxrate 9000 -qmin 2 -qmax 20 -bf 2
(and not just -b 4000 !)

Thanks Darren & Hervé for your kind explanation.

Summary for now:

- Darren suggest to lower -b but Hervé said it will cause buffer
underflow.
- Hervé suggested to use VBR, which is almost the same as what I used
(-b 3600 -maxrate 4500 -sameq), but I was told that it is CBR.

hmm.., there seems to be still some confusions going on.

tong

VBR
-qmin 2 -qmax 20
(adaptative quantization)

and
-bf 2 to reduce the output size
(B frames are more little than P frames )

play with qmax, do not low bitrate

bye

Hervé

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