Feature request: enable transcoding only for certain file types

[AlphaJack]

Can you add an option to transcode only certain file types? This would be useful when one has both lossy and lossless files in his library

[epoupon]

Was thinking about this : maybe we would need an automatic mode here?
Something like "transcode only if native format is not supported". However, that would work only for the web player. It would be necessary to make a dedicated transcode settings for it.

[epoupon]

Ok I tested this idea and it seems to work fine. The web player automatically falls back on the transcoded version if it does not manage to use the native file.

Here is what I am planning in order to simply the whole thing:

1. Reintroduce the configuration-file based option to enable/disable the Subsonic API (what I did in 3.11.0 seems to be a bad move unfortunately) and remove the subsonic API panel from administration menu.
2. Create a new Subsonic API section in the user's settings panel (only if the API is enabled). In here, put the following option:s
   • preferred transcoding option: none/mp3/ogg/etc. (used if it is not set in the format arg of the stream command)
   • preferred transcoding bitrate (used if it is not set in the format arg)
   • Artist list mode: (all artists/ album artists)
3. Make the current transcode section local to the browser (i.e. store information in local storage), with the following options: (could be made local storage in a further step though). The idea of this is to get different transcode parameters if you are at home/work/mobile.
   • Transcode mode : auto/never/always (maybe auto needs something more explicit like 'only if not supported')
   • Transcode format: as before
   • Transcode bitrate : as before
4. As there is now multiple ways to get the files from the server, remove the max bitrate option that exists for each user.

[epoupon]

Feel free to open additional issues if it does not fit your needs.