changing youtube video

[William Park]

On Fri, Jan 18, 2013 at 08:30:22PM +0400, Zbigniew Koziol wrote:
> You here were so kind to help me enormous number of times.
> 
> I met with this nice movie on youtube concerning science in general
> and thinking, close to philosophy:
> 
> http://www.youtube.com/watch?feature=player_embedded&list=PL25D581BA7A64EF48&v=JnWyPIzTOTw
> 
> Anyone could advise how to add subtitles there in another language?
> 
> Or, better, how to replace the sound track?
> 
> On Linux, of course.

Not sure about subtitle, which, I think, is separate file.  The only
change that I do on YouTube videos is to normalize volume.  I haven't
found a way to change the volume "in-place".  So, I extract the audio to
.wav, normalize the volume, and reassemble them again.  Commands are
    ffmpeg -i xxx.mp4 xxx.wav
    normalize xxx.wav
    ffmpeg -i xxx.mp4 -i xxx.wav -vcodec copy -ab 110k xxx2.mp4
-- 
William
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