You have some fine points.
I copied a file from NAS to home directory / the internal SD card, and played it using mpg123. The result: less stuttering, over bluetooth. I'll have to redo the test at a proper hour, during the day.
I don't have the hardware to experiment with HDMI out. I experimented with a USB sound card and there is no stutter.
I experimented with a 256kbps MP3. The Pi, the BT speaker and the router are in the same room.
LE: I posted the issue on https://github.com/RPi-Distro/firmware-nonfree/issues
I copied a file from NAS to home directory / the internal SD card, and played it using mpg123. The result: less stuttering, over bluetooth. I'll have to redo the test at a proper hour, during the day.
I don't have the hardware to experiment with HDMI out. I experimented with a USB sound card and there is no stutter.
I experimented with a 256kbps MP3. The Pi, the BT speaker and the router are in the same room.
LE: I posted the issue on https://github.com/RPi-Distro/firmware-nonfree/issues
