Re-encoding
From LinuxTVWiki
Re-encoding (short: recoding) means to change the codec which is used to store a film. When a file is recoded, the software decodes the program and encodes it again. Often a more efficient codec is used to create smaller files that can be easily archived. For example, a program is broadcasted as MPEG2 with 4000 kbit/s via DVB and one recodes it into XviD with 1000 kbit/s.
Recoding is the part of post-processing your recordings which is by far the most CPU intense. You're lucky if you can encode in real time into MPEG4 with an older 1.6 GHz processor.
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Software Examples
MEncoder
Examples of how to use MEncoder for recording and recoding of streams is available from the MEncoder page.
ffmpeg
Please add or I'll do it soon
