[MEncoder-users] mplayer -vc null -vo null -ao pcm:fast: Your system is too SLOW to play this!

[Guillaume POIRIER]

Hi,

On 1/1/07, Strong <s-strong at mail.ru> wrote:
> I dump sound out of avi with this (is it more efficient with mencoder?):
>
> $ mplayer -vc null -vo null -ao pcm:fast 2006.avi
>
> And get this:
> MPlayer 1.0rc1-rpm.livna.org-4.1.1 (C) 2000-2006 MPlayer
> Team CPU: Intel(R) Celeron(R) CPU 2.26GHz (Family: 15, Model: 3,
> Stepping: 3) CPUflags:  MMX: 1 MMX2: 1 3DNow: 0 3DNow2: 0 SSE: 1 SSE2: 1
> Compiled with runtime CPU detection.
> mplayer: could not connect to socket
> mplayer: No such file or directory
> Failed to open LIRC support. You will not be able to use your remote
> control.
>
> Playing 2006.avi.
> AVI file format detected.
> VIDEO:  [FMP4]  352x244  24bpp  25.000 fps  709.0 kbps (86.6 kbyte/s)
> Clip info:
>  Software: MEncoder 1.0rc1-4.1.1
> ==========================================================================
> Forced video codec: null
> Opening video decoder: [null] Null video decoder
> VDec: vo config request - 352 x 244 (preferred colorspace: BGR 24-bit)
> VDec: using Planar YV12 as output csp (no 0)
> Movie-Aspect is 1.57:1 - prescaling to correct movie aspect.
> VO: [null] 352x244 => 384x244 Planar YV12
> Selected video codec: [null] vfm: null (NULL codec (no decoding!))
> ==========================================================================
> ==========================================================================
> Opening audio decoder: [liba52] AC3 decoding with liba52
> Using SSE optimized IMDCT transform
> Using MMX optimized resampler
> AUDIO: 48000 Hz, 2 ch, s16le, 256.0 kbit/16.67% (ratio: 32000->192000)
> Selected audio codec: [a52] afm: liba52 (AC3-liba52)
> ==========================================================================
> [AO PCM] File: audiodump.wav (WAVE)
> PCM: Samplerate: 48000Hz Channels: Stereo Format s16le
> [AO PCM] Info: Faster dumping is achieved with -vc null -vo null -ao
> pcm:fast [AO PCM] Info: To write WAVE files use -ao pcm:waveheader
> (default). AO: [pcm] 48000Hz 2ch s16le (2 bytes per sample)
> Starting playback...
> A:   2.7 V:   2.4 A-V:  0.291 ct: -0.000  62/ 62  0%  0%  0.5% 55 0
>
>            **** Your system is too SLOW to play this!  ****
>
> Why is for my Celeron 2,26GHz and 512Mb RAM?!
> And it is at the first.
>
> At the second it does not save all the sound it length is 2 hrs. Ho to
> fix this?

Use -vc dummy


> And yet another question, Is it possible to:
> 1. spare just one *specified* channel and save in wave;

use -af channel or -af pan


> 2. spare just one *specified* channel and save in mp3 at the specified
> rate or even specify variable rate?

same as above, and you just probably need to resamble and re-encode.

Guillaume
-- 
An association of men who will not quarrel with one another is a thing
which has never yet existed, from the greatest confederacy of nations
down to a town meeting or a vestry.
 -- Thomas Jefferson
(when interviewed about MPlayer ML flamewars)
http://www.brainyquote.com/quotes/quotes/t/thomasjeff157207.html