Denon DNP-F109 seek problem

[bubbleguuum]

To make finding the cause of this issue easier, I have compared the DIDL-Lite sent to the Denon (via SetAVTransportURI) between the proxy and the non-proxy minimserver.
As a side note, BubbleUPnP log output always contains the DIDL-Lite sent to a renderer.

DIDL-Lite is identical except for the protocolInfo part:

minimserver: protocolInfo="http-get:*:audio/mpeg:*"
proxy minimserver: protocolInfo="http-get:*:audio/mpeg:DLNA.ORG_PN=MP3;DLNA.ORG_OP=01;DLNA.ORG_CI=0"

The important part is DLNA.ORG_OP=01, with the second digit 1 indicating that http range based seek is supported.

And this might explain why FLAC seeking may fails since DLNA.ORG_OP is never transmitted in that case since there is no DLNA profile for FLAC (eg a DLNA.ORG_PN value associated to FLAC).
It will be worth trying to set DLNA.ORG_OP=01 for FLAC and others types (WAV) just in case it works by miracle.