[MPlayer-users] AAC MP4 on PPC64 system - no audio? Unknown/missing audio format - Cannot find codec for audio format 0xFF.

[Stroller]

Hi there,

I'm having some audio problems with a .mp4 video which (short story)  
was created using the "export" option in Quicktime running on a Mac.

The audio is AAC - in fact, Quicktime says "AAC-LC", and there are no  
other options for audio when I export this movie - and I have tried  
creating the file at 192kbps (unknown sampling rate) and then 128kbps  
at 44.1kHz and 48kHz. Quicktime's "Export Settings" dialogue box has  
a summary at the bottom when you're choosing the settings with which  
to save the file; it has a "Conformance" line which claims "the file  
conforms to MP4 format specification".

As you'll see from the attached configure.txt the AAC libraries  
installed on my system seem to be recognised when I build mplayer.  
The mplayer binary is built from source, from SVN dated a couple of  
months ago. This system plays the audio fine on all other videos I've  
tried, and I have been using it quite happily the last couple of months.

The output when I try to play this file is attached as linux_ps3.txt.
Executive summary:
   Opening audio decoder: [faad] AAC (MPEG2/4 Advanced Audio Coding)
   FAAD: compressed input bitrate missing, assuming 128kbit/s!
   Unknown/missing audio format -> no sound
   ADecoder init failed :(
   Cannot find codec for audio format 0xFF.
   Audio: no sound

I mostly use Macs on the desktop (this video plays fine in Quicktime,  
of course) and Linux headless for servers, so I don't have any other  
Linux machines I can try this file on properly. However I did try  
running it with the "-vo null" option on one of my servers - on that  
system mplayer is built from the Gentoo ebuild "1.0_rc2_p25993", and  
after recompiling with a couple of USE flags set ("aac" and "a52", I  
think) that seems to find the audio OK. The output from playing the  
video on that system is attached as linux_p4.txt - I have included  
the md5sum of the file to double-check that I wasn't daft enough to  
be playing different versions on the two machines!

Therefore I assume this problem not to be a bug with mplayer, but  
something local to my PS3 Linux system.

Can anyone suggest what I might have done wrong, please? Or how to  
troubleshoot further?

I have media-libs/faac installed on both machines - version 1.26-r1  
from Gentoo's portage - and likewise media-libs/faad2, 2.0-r13.

When Googling this error I encountered an Ubuntu forums post that  
mentioned codecs.conf. It appears this is not copied to /etc during  
`make install`  but that I have a copy in the sources I downloaded  
from SVN. It does not make any difference if I copy this to "/etc/ 
codecs.conf" (or "/etc/mplayer/codecs.conf" but I think that's an  
Ubuntu-specific path) or to "~/.mplayer/codecs.conf". The other  
machine does not have a codecs.conf, either (except in /usr/share/doc/ 
mplayer/DOCS/tech/).

Many thanks in advance for any pointers,

Stroller.




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