[LAU] Retrieving audio info from a video file

[Lorenzo]

-------- Original Message --------
Subject: Re: [LAU] Retrieving audio info from a video file
From: luigi curzi <luigi_curzi at yahoo.it>
To: linux-audio-user at lists.linuxaudio.org
Date: 09/02/2010 12.57
> Il giorno Tue, 09 Feb 2010 11:12:30 +0000
> Jonathan Gazeley<jonathan.gazeley at bristol.ac.uk>  ha scritto:
>
>    
>> On 02/09/2010 10:38 AM, Emiliano Grilli wrote:
>>      
>>> Jonathan Gazeley<jonathan.gazeley at bristol.ac.uk>   writes:
>>>
>>>
>>>        
>>>> Hi all,
>>>>
>>>> This is slightly OT for the group, but I hope someone can tell me.
>>>>
>>>> I have thousands of large AVI files and I want a quick way to
>>>> determine from the command line whether their audio is stereo,
>>>> 5.1, etc.
>>>>
>>>> I've read about ffmpeg and haven't seen anything jumping out at
>>>> me, and it's hard to pick the right search keywords to find
>>>> relevant pages on Google.
>>>>
>>>> Anyone know a trick to get this info? Currently I can do it by
>>>> right-clicking on the file and viewing its properties, but there
>>>> *has* to be a better way...
>>>>
>>>>          
>>> maybe "mplayer -frame 0 -identify myfile.avi" ?
>>>
>>>
>>>
>>>        
>>>> Cheers,
>>>> Jonathan
>>>>
>>>>          
>>> HTH
>>> Ciao
>>>
>>>
>>>        
>> Thanks for your advice. Unfortunately this seems to require a
>> graphical machine, but I'm trying to run this on a headless
>> fileserver that has all my media.
>>
>> [jonathan at zeus ~]$ mplayer -frame 0 -identify movie.avi
>> Creating config file: /home/jonathan/.mplayer/config
>> Unknown option on the command line: -frame
>> Error parsing option on the command line: -frame
>> MPlayer SVN-r29701-4.4.1 (C) 2000-2009 MPlayer Team
>>
>> Any other ideas?
>>
>>      
> the right command line is:
> mplayer -frames 0 -identify -ao null -vo null movie.avi
>
>    
Also if you have many files in (say) a dir you could do something like 
this with ffmpeg (warning untested!):

Reply
Edit
#!/bin/bash
for videoFile in `ls *.avi`; do
     ffmpeg -i "$videoFile" 2> ffInfoTemp
     echo $videoFile: `cat ffInfoTemp | grep "Audio"`
done
rm ffInfoTemp

This *should* print the avi file name and the "Audio..." string(s) from 
ffmpeg for all avi files in the dir

Lorenzo
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