[MPlayer-users] Re: Extract AAC Audio Fails

[Brent Robertson]

Alright, here the details w/o the really quiet flag.  It suggests  
it's working...but the result is an appropriated sized, but blank WAV  
file (the data is not strictly all 0x00, but the audio has a min  
sample value of -0.000213 and a max of 0.0002441 and sounds like  
white even when amplified) :

MPlayer 1.0pre7-3.3 (C) 2000-2005 MPlayer Team
AltiVec found
CPU: PowerPC

Playing my_file.mov.
ISO: File Type Major Brand: Original QuickTime
QuickTime/MOV file format detected.
--------------
MOV track #0: 3176 chunks, 29173 samples
Audio bits: 16  chans: 2  rate: 44100
Audio extra header: len=103  fcc=0x77617665
MOV: Found MPEG4 audio Elementary Stream Descriptor atom (51)!
Fourcc: a4pm
--------------
MOV track #1: 2728 chunks, 10182 samples
MOV: Found MPEG4 movie Elementary Stream Descriptor atom (69)!
Image size: 320 x 240 (24 bpp)
Display size: 320 x 240
Fourcc: v4pm  Codec: 'MPEG-4 Video'
--------------
MOV track #2: 2716 chunks, 10182 samples
Generic track - not completely understood! (id: 2)
--------------
MOV track #3: 2709 chunks, 12017 samples
Generic track - not completely understood! (id: 3)
--------------
MOV: longest streams: A: #0 (29173 samples)  V: #1 (10182 samples)
VIDEO:  [v4pm]  320x240  24bpp  14.985 fps    0.0 kbps ( 0.0 kbyte/s)
======================================================================== 
==
Opening audio decoder: [faad] AAC (MPEG2/4 Advanced Audio Coding)
AUDIO: 44100 Hz, 2 ch, s16be, 160.0 kbit/11.34% (ratio: 20000->176400)
Selected audio codec: [faad] afm:faad (FAAD AAC (MPEG2/MPEG4 Audio)  
decoder)
======================================================================== 
==
======================================================================== 
==
Forced video codec: dummy
Cannot find codec matching selected -vo and video format 0x7634706D.
Read DOCS/HTML/en/codecs.html!
======================================================================== 
==
Checking audio filter chain for 44100Hz/2ch/s16be -> 44100Hz/1ch/ 
s16be...
AF_pre: 44100Hz/2ch/s16be
[AO PCM] File: my_file.wav (WAVE)
PCM: Samplerate: 44100Hz Channels: Mono Format s16le
[AO PCM] Info: fastest dumping is achieved with -vc dummy -vo null
PCM: Info: to write WAVE files use -waveheader (default).
AO: [pcm] 44100Hz 1ch s16le (2 bps)
Building audio filter chain for 44100Hz/2ch/s16be -> 44100Hz/1ch/ 
s16le...
Video: no video
Starting playback...


>
> > Hi there;
> >
> > I use mplayer to extract audio from MOV files and typically it
> > works wonderfully!  However, ones with AAC don't seem to extract
> > properly -- I get a blank WAV.
> Can you give us locations of example files? If we can compare what's
> going on with your system to what happens when we try, we can see if
> it's a more general problem.
> >   :-(  The audio is played just fine when I view the MOV in
> > mplayer.  This problem seems platform independent -- I get the same
> > results on Linux and MacOS X.  My command line looks like this:
> >   [localhost]% mplayer my_file.mov -really-quiet -channels 1 -ao
> > pcm:waveheader:file= my_file.wav -vo null -vc
>                                       ^^^^^^^^^^^^^
>                                  Get rid of that. We need to see what
> it's spewing.
> > dummy
> >
> > It seems to work just fine for everything else (RM, WMV, MP3, MOV
> > with other audio codecs, etc).
> >
> > Here's my version info:
> >   [localhost]% mplayer -ao help
> > MPlayer 1.0pre7-3.3.3 (C) 2000-2005 MPlayer Team
> > CPU: Intel Pentium 4/Xeon/Celeron Northwood (Family: 8, Stepping: 3)
> > Detected cache-line size is 64 bytes
> > CPUflags:  MMX: 1 MMX2: 1 3DNow: 0 3DNow2: 0 SSE: 1 SSE2: 1
> > Compiled for x86 CPU with extensions: MMX MMX2 SSE SSE2
> >
> > Available audio output drivers:
> >         mpegpes Mpeg-PES audio output
> >         oss     OSS/ioctl audio output
> >         alsa    ALSA-0.9.x-1.x audio output
> >         arts    aRts audio output
> >         esd     EsounD audio output
> >         sdl     SDLlib audio output
> >         null    Null audio output
> >         pcm     RAW PCM/WAVE file writer audio output
> >
> > Any fixes for this?
>