See the documentation for ffmpeg for far more details, but here are some simple examples.
Let's say you have some sort of video file. Maybe you used keepvid.com to save a video from YouTube and now you want to extact and save just the audio track as an MP3 file.
Let's assume that your movie file is moviefile.mpeg and your desired MP3 file is audiofile.mp3 — add the full or a relative path to the following commands as needed.
It's simple! Just do this:
$ ffmpeg -i moviefile.mpeg -f mp3 audiofile.mp3
That's it!
You can specify the audio bitrate and the audio sampling rate if you want. Here is how you get relatively high quality 128 kbps audio (assuming the original video file had good audio!) sampled at the 44,100 sample/second rate used on a CD:
$ ffmpeg -i moviefile.mpeg -ab 128000 -ar 44100 -f mp3 audiofile.mp3
What if the video file is some non-MPEG format, like Flash (ugh) or AVI or WMV? Then you will need the appropriate codec plugin for ffmpeg. With some Linux distributions you will need to look outside the distribution itself for the codecs, and maybe even for ffmpeg itself. The Penguin Liberation Front has some useful additions. Note that PLF provides source code in addition to binary RPMs.
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