[MPlayer-users] Re: Extract AAC Audio Fails

[Kichigai Mentat]

Duct Tape Tip No. 162:
     Write a book about duct tape's many uses.
     --The Duct Tape Book by Jim and Tim

On Jun 10, 2005, at 17.30, Brent Robertson wrote:

> 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
          ^^^^^
Bingo. Isn't that Apple's protected FOURCC? I know that protected AAC  
files come with a .m4p extension.
> --------------
> 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?
>>
>>
>
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