Replay gain

[simoncn]

This is why you are not getting replay gain processing. You need to put something in stream.transcode to make MinimStreamer use ffmpeg to process the audio stream and apply replay gain and other audio filters. I suggest you try this:

flac:wav;

or this:

flac:wav24;

Both these settings enable ffmpeg for audio processing. The wav24 setting also pads each audio sample to 24 bits if the input stream has a lower bit depth. With some renderers, this can improve sound quality. Make sure you include the semicolon at the end.