mirror of
https://github.com/spl0k/supysonic.git
synced 2024-11-10 04:02:17 +00:00
80 lines
3.0 KiB
Markdown
80 lines
3.0 KiB
Markdown
|
# Transcoding
|
||
|
|
|
||
|
|
Transcoding is the process of converting from one audio format to another. This
|
||
|
|
allows for streaming of formats that wouldn't be streamable otherwise, or
|
||
|
|
reducing the quality of an audio file to allow a decent streaming for clients
|
||
|
|
with limited bandwidth, such as the ones running on a mobile connection.
|
||
|
|
|
||
|
|
Transcoding in _Supysonic_ is achieved through the use of third-party
|
||
|
|
command-line programs. _Supysonic_ isn't bundled with such programs, and you are
|
||
|
|
left to choose which one you want to use.
|
||
|
|
|
||
|
|
If you want to use transcoding but your client doesn't allow you to do so, you
|
||
|
|
can force _Supysonic_ to transcode for that client by going to your profile page
|
||
|
|
on the web interface.
|
||
|
|
|
||
|
|
## Configuration
|
||
|
|
|
||
|
|
Configuration of transcoders is done on the `[transcoding]` section of the
|
||
|
|
[configuration file](configuration.md).
|
||
|
|
|
||
|
|
Transcoding can be done by one single program which is able to convert from one
|
||
|
|
format directly to another one, or by two programs: a decoder and an encoder.
|
||
|
|
All these are defined by the following variables:
|
||
|
|
|
||
|
|
* `transcoder_EXT_EXT`
|
||
|
|
* `decoder_EXT`
|
||
|
|
* `encoder_EXT`
|
||
|
|
* `trancoder`
|
||
|
|
* `decoder`
|
||
|
|
* `encoder`
|
||
|
|
|
||
|
|
where `EXT` is the lowercase file extension of the matching audio format.
|
||
|
|
`transcoder`s variables have two extensions: the first one is the source
|
||
|
|
extension, and the second one is the extension to convert to. The same way,
|
||
|
|
`decoder`s extension is the source extension, and `encoder`s extension is the
|
||
|
|
extension to convert to.
|
||
|
|
|
||
|
|
Notice that all of them have a version without extension. Those are generic
|
||
|
|
versions. The programs defined with these variables should be able to
|
||
|
|
transcode/decode/encode any format. For that reason, we suggest you don't use
|
||
|
|
these if you want to keep control over the available transcoders.
|
||
|
|
|
||
|
|
_Supysonic_ will take the first available transcoding configuration in the
|
||
|
|
following order:
|
||
|
|
|
||
|
|
1. specific transcoder
|
||
|
|
2. specific decoder / specific encoder
|
||
|
|
3. generic decoder / generic encoder (with the possibility to use a generic
|
||
|
|
decoder with a specific encoder, and vice-versa)
|
||
|
|
4. generic transcoder
|
||
|
|
|
||
|
|
All the variables should be set to the command-line used to run the converter
|
||
|
|
program. The command-lines can include the following fields:
|
||
|
|
|
||
|
|
* `%srcpath`: path to the original file to transcode
|
||
|
|
* `%srcfmt`: extension of the original file
|
||
|
|
* `%outfmt`: extension of the resulting file
|
||
|
|
* `%outrate`: bitrate of the resulting file
|
||
|
|
|
||
|
|
One final note: the original file should be provided as an argument of
|
||
|
|
transcoders and decoders. All transcoders, decoders and encoders should write
|
||
|
|
to standard output, and encoders should read from standard input.
|
||
|
|
|
||
|
|
## Suggested configuration
|
||
|
|
|
||
|
|
Here are some example configuration that you could use. This is provided as-is,
|
||
|
|
and some configurations haven't been tested.
|
||
|
|
|
||
|
|
```ini
|
||
|
|
[transcoding]
|
||
|
|
transcoder_mp3_mp3 = lame --quiet --mp3input -b %outrate %srcpath -
|
||
|
|
transcoder = ffmpeg -i %srcpath -ab %outratek -v 0 -f %outfmt -
|
||
|
|
decoder_mp3 = mpg123 --quiet -w - %srcpath
|
||
|
|
decoder_ogg = oggdec -o %srcpath
|
||
|
|
decoder_flac = flac -d -c -s %srcpath
|
||
|
|
encoder_mp3 = lame --quiet -b %outrate - -
|
||
|
|
encoder_ogg = oggenc2 -q -M %outrate -
|
||
|
|
```
|
||
|
|
|