linuxaudio.org

On 03/04/2012 07:48 PM, James Stone wrote:

quoted text
> Hi List,

>

> I have a video which needs a bit of eq'ing on the audio side. Can

> anyone point me in the direction of how to split the file into audio

> and video so I can apply some treatment to the audio, and then combine

> them back together again? The video is wmv at the moment, but mplayer

> doesn't seem to have any problem with it.

> 

#extract audio

ffmpeg -i orig_video.wmv audio_out.wav
#replace audio

ffmpeg \

  -i orig_video.wmv \

  -i new_audio.wav \

  -vcodec copy \

  -map 0.0 -map 1.0 \

  new_video.wmv
Details:  The "map" may be different depending on the .wmv file.

run `ffprobe` to see which is the video-track in the .wmv file

usually this is "0.0".

    Stream #0.0: Video:...

    Stream #0.1: Audio: ..

and "1.0" corresponds to the 2nd input file - your new audio.
You may want to add "-acodec wmav2" and "-ar 128k" options for 128kbit/s

Windows Media Audio 2 or whatever audio-codec/quality your want. `ffmpeg

-codecs | grep "EA"` gives you a list of available codecs for Encoding

Audio.
BTW. Ardour3 with videotimeline patch can do all this for you.

import,extract,re-encode using ffmpeg.
robin

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