Depending on whether I use Playbin or VLC as the media player to which
Rygel transmits audio files, the issue is not exactly the same :
1) With Rygel+Playbin, no file may be heard, whether MP3 or FLAC. The
files seem to play (I can see the time line move as time goes by) but
there is no sound. I guess this means that Playbin should be so
configured as to recognize my HifiBerry soundcard. Are there any
options to do that ? All I see are options regarding Gstlaunch in
rygel.conf but I understand this configures a server, not a renderer
(and I tried anyway to add my soundcard and flac mime-types, according
to various tutorials, but no luck)

Sorry, I have a patch lying around to make the audio sink more configurable,
but I need to wrangle some documents before I can apply that upstream.

Basically what you could to is make the HifiBerry the "default" device
in ALSA if you are not using pulse underneath.

2) If I use VLC instead of playbin (by enabling MPRIS and disabling
Playbin in /home/pi/.config/rygel.conf, and then launching VLC before
Rygel), VLC reads perfectly the MP3 files but not the FLAC ones (701
code error : illegal mime-type).
I asked the developers of the BubbleUpnp app what should be done. They
answered that "The fix for FLAC for this Rygel/VLC renderer  is just
for developers to add the FLAC mime-type to the list. It's a 10s
I can play FLAC files from another computer to Rygel+VLC using
Foobar2000 : as Foobar2000 changes my FLACs into WAV (or PCM?) before
sending them to the Rpi. But BubbleUpnp does not this conversion.

Rygel uses org.mpris.MediaPlayer2.SupportedMimeTypes to query the remote
player. VLC does not expose a specific MIME type for flac, only the
generic "application/ogg":

readonly as SupportedMimeTypes = ['audio/mpeg', 'audio/x-mpeg', 'video/mpeg', 'video/x-mpeg', 'video/mpeg-system', 'video/x-mpeg-system', 'video/mp4', 'audio/mp4', 'video/x-msvideo', 'video/quicktime', 'application/ogg', 'application/x-ogg', 'video/x-ms-asf', 'video/x-ms-asf-plugin', 'application/x-mplayer2', 'video/x-ms-wmv', 'video/x-google-vlc-plugin', 'audio/wav', 'audio/x-wav', 'audio/3gpp', 'video/3gpp', 'audio/3gpp2', 'video/3gpp2', 'video/divx', 'video/flv', 'video/x-flv', 'video/x-matroska', 'audio/x-matroska', 'application/xspf+xml'];

The issue is that VLC does not offer a specific FLAC mime type via MPRIS
so that will not match up with what BubbleUPnP sends as mime type for the

I cannot test here currently with BubbleUPnP due to network restrictions,
can you enable Debugging in Rygel (G_MESSAGES_DEBUG=all rygel -g 5) and
check what content-type BubbleUPnP is sending towards rygel? Maybe we need
to implement some generic matching towards application/ogg

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