Delay in streaming of mp3

[sonnius]

All,

I've got a curious problem with mp3 streams, there are three scenarios:

1. flac/m4a file transcoded to mp3 -> no delay
2. mp3 file transcoded to mp3 -> no delay
3. mp3 file not transcoded -> delay

In my setup subsonic is behind a nginx proxy, it seems that when playing a plain mp3 file the player buffers a much larger chunk before the playback starts.

In the scenario where I transcode the mp3 file to mp3 (using the default transcode settings) this behavior is not observed.

Any insight to what could cause this would be greatly appreciated.