====== Ubuntu - Sound - ffmpeg ======

Transcode from and to a wide variety of formats.

FFmpeg is a powerful open source tool for multimedia handling like conversion/transcoding.

Installing is easy with a sufficient recent Linux distribution, install the "ffmpeg" package.

Note that you may need to install "libavcodec-unstripped-52", to make mp3 encoding possible.

FFmpeg is typically used for video, but audio transcoding works too and is pretty simple:


Minimal example: transcode from MP3 to WMA.

<code bash>
ffmpeg -i input.mp3 output.wma
</code>


Get the list of supported formats with:

<code bash>
ffmpeg -formats
</code>


Convert WAV to MP3, mix down to mono (use 1 audio channel), set bit rate to 64 kbps and  sample rate to 22050 Hz.

<code bash>
ffmpeg -i input.wav -ac 1 -ab 64000 -ar 22050 output.mp3
</code>

Note: you can also use '-ab 64k', but unsure how well this is supported in different version of FFmpeg.


Picking the 30 seconds fragment at an offset of 1 minute:
In seconds

<code bash>
ffmpeg -i input.mp3 -ss 60 -t 30 output.wav
</code>

In HH:MM:SS format

<code bash>
ffmpeg -i input.mp3 -ss 0:01:00 -t 0:00:30 output.wav 
</code>