Add support for VBR mp3
-----------------------
Key: LS-566
URL: http://dev.sourcefabric.org/browse/LS-566
Project: Liquidsoap
Issue Type: Bug
Reporter: Samuel Mimram
Assignee: Romain Beauxis
Priority: Major
>From the ML:
> Can someone provide me with a working example of generating a VBR mp3 audio
> stream please? I've tried various combinations of the quality setting but
> it's always resulted in a fixed bit rate stream.
> Also, am I right in assuming the bitrate and quality parameters are mutually
> exclusive?
Good catch!
Reading from ocaml-lame docs, I realize our current %mp3 format is in
fact a constant bitrate encoder. The quality parameter is not mutally
exclusive and complements the bitrate parameter:
(**
* Internal algorithm selection. True quality is determined by the bitrate
* but this variable will effect quality by selecting expensive or cheap
* algorithms. The quality is an integer between 0 and 9, where 0=best (very
* slow) and 9=worst. More precisely:
* - 2: near-best quality, not too slow (recommended)
* - 5: good quality, fast
* - 7: ok quality, really fast
*)
We need to implement a %mp3.vbr and also update our documentation. I
will take care of that ASAP.
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