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Old 01-26-2009, 05:17 PM   #1
JavaNinja
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Ffmpeg and Xing header - iTunes issue and Duration issue


Hello all,

I extract the audio from a bunch of flv files as an MP3. This works great:

Code:
ffmpeg -i video.flv -vn -acodec copy audio.mp3
However, some audio that I extract have durations that are longer than they should be and some MP3 files keep looping the audio! Also in some audio players like Windows Media Player, the seekbar gets stuck at one point but plays the mp3.

I have found out this is due to Xing headers not being correct or set (?). I was hoping someone could help me edit the above command so this is fixed and maybe some explanation of why this happens so I can learn.

Any help highly appreciated
 
Old 01-26-2009, 08:49 PM   #2
niknah
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What you're doing there is copying the audio straight from the .flv file.
It may not have been stored as mp3 in the .flv file.

Try...
ffmpeg -i video.flv -vn -acodec libmp3lame audio.mp3
 
Old 01-26-2009, 08:49 PM   #3
niknah
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Waa

Last edited by niknah; 01-26-2009 at 09:09 PM.
 
Old 01-26-2009, 08:59 PM   #4
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stupid site crashed and I hit reload

Last edited by niknah; 01-26-2009 at 09:10 PM.
 
Old 01-27-2009, 09:17 AM   #5
JavaNinja
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That is strange your command only worked for me when i changed libmp3lame to just mp3. It must be just my settings?

That commands works for a normal convert but I am going to test it on my weird flv and report back.
 
Old 01-27-2009, 04:05 PM   #6
niknah
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Yes it's different depending on how the person who made the package compiled it, run "ffmpeg -formats" to see the supported formats.
 
Old 02-04-2009, 08:28 AM   #7
JavaNinja
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Hey,

After much testing and no complaints from my users. I can say that your solution worked very well nikha. Thank you.

One thing though, i've had one of my users email me this:
"your site give the smaller mono audio from flv instead of the higher quality stereo from mp4"

Is there a way for me to set quality to as high as possible can be? Or maybe copy the quality of the audio in the flv before i convert it to mp3?

Thank you for anymore help.
 
Old 02-04-2009, 09:14 AM   #8
niknah
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Try the "-ac 2" option for stereo, for extra quality try something like "-ab 192k" (to set the bitrate)

Thanks for the thumbs up!
 
  


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