Le mardi 23 juin 2009 13:28:08, Jean-Francois Mauguit a écrit :
> Hello,
Hi !
> I've seen in the logs, liquidsoap is trying some decoders before using
> mp3 (as our sounds are all using mp3). Is there a way in the liq to
> say it's mp3 (and so avoid this try and error process) ?
Not yet. However, we would like to add this possibility to liquidsoap, it only
needs contributors willing to do it :)
See:
http://savonet.rastageeks.org/ticket/258
Currently, the MP3 decoder is tried last because for detection purpose, mp3
format is very bad: it had no header, hence it can appear that random files,
such as JPEG images are taken as mp3.. Hence, we try to test all decoders
before it, since it might accept files that were not for it.
> Moreover, a little suggestion, could you first try the encoder linked
> to the extension of the file as in the most of the case it is the
> right one (.ogg => vorbis, .mp3 => mp3, etc ...) ?
We have always wanted to avoid using file extension for detecting the audio
format. This is rather weak. Instead we try to decode audio data from the file.
In the case of mp3, there is also a mime check done when ocaml-magic support
has been compiled.
All in all, the decoder checks for formats other than mp3 should not be very
expensive in terms of load.. The only case is decoders using ocaml-natty, due
to some internal limitation in ocaml-bitmatch, and that is why these decoders
are disabled by default..
Romain
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