transcoding help for Raspberry Pi 4?

[simoncn]

You are correct that you will need to specify detailed transcoding instructions for each file type. Here is a first pass at what I think you will need to specify in stream.transcode, broken down by each file type and resolution in your library.

flac(44):wav24;176
flac(48):wav24;192
flac(88):wav24;176
flac(96):wav24;192
flac(176):wav24;176
flac(192):wav24;192
mp3:wav24;176
wav(44):wav24;176
wav(48):wav24;192
wav(88):wav24;176
wav(96):wav24;192
wav(<24;176):wav24;176
wav(<24;192):wav24;192
dsf:wav24;176
aiff(44):wav24;176
aiff(48):wav24;192
aiff(88):wav24;176
aiff(96):wav24;192
aiff(176):wav24;176
aiff(192):wav24;192

All the above lines need to be concatenated into a single string, separated by commas.

You will need to install ffmpeg on your RPi4. See the FFmpeg Downloads page for details of standard FFmpeg packages. You might be able to use sudo apt to install a standard FFmpeg package on your RPi4. If this is not available, you will need to download a static build for FFmpeg and copy the ffmpeg executable into the MinimServer opt/bin folder as described in this section.

I think the RPi4 will have enough power to handle all the above transcoding combinations but it might possibly struggle with DSD128 .dsf files.