It's been few months since I last compiled XBMC as I use pre-compiled binary packages for my RPi these days. Nonetheless, I am downloading the XBMC master branch from your GIT and I will certainly compile and run it (unless I hit some serious troubles on the way).
I will update this post once I have some more information to share. Either today or tomorrow at latest.
Edit 1:
XBMC downloaded and compiled. Behavior of the resulting system is the same as it was described in
the first post of this thread with one (perhaps important) difference: XBMC does not report "VNSI: no signal". However, the other symptoms remain the same. For the sake of completeness, here is a
syslog produced by the system. I thought I would also augment the VDR plugin source code and add those ERRORLOG statements but I could not find cVideoBufferSimple in the new version of the code.
Edit 2:
When doing the test above, the master branch of xbmc-pvr-addons was used - not the vnsi4 branch. I'm sorry for the omission. I am compiling the xbmc-pvr-addons from the vnsi4 branch as I am typing this message and I will report the result shortly.
Edit 3:
OK,
XBMC v.13 alpha from the master branch of the FernetMenta repository compiled together with
xbmc-pvr-addons from the vnsi4 branch of the FernetMenta repository. The result is exactly the same as it was described in
the first post of this thread, incl. the "VNSI: no signal" message. Last but not least, here is the
syslog.