So for now I got it up and running with margro's latest PVR-build and his brilliant TSReader, using a locally installed MP-TV-server with a dual-DVB-T-Tuner (Terratec) on a Core i3-Sandybridge-system.
Except the known issues, I wonder why XBMC cannot play my recordings made (ts-files) while timeshifting e.g. works flawlessly.
A known bug?
EDIT: sry, forgot to mention that I'm running Win7x64...
I think I had the same problem on a setup like yours. What I did find out after a bit of trying is that I probably used the ffmpeg from another build. Reading back my own posts in this thread I see that I mixed margo's build with the pvr-build. There was once even a rar archive with fixed ffmpeg dll's.
I think I needed only one or two dll's to be replaced. Just make a backup of margo's and replace with ffmpeg from the alternate build ones and see if the .ts files will play.
See for more info a couple of pages back in this thread. There are a couple of posts about it from me.