Vpeter, I am sorry to say but we are going into a big misunderstanding! First of all, I do NOT want to blame you, the opposite, I appreciate your work. But your last mail need some clarification for the question if SW can reproduce 1920x1080i movies from NAS or LiveTV satisfactorily on the Matrix.
1. TBS-MatrixTV-V1.0.1.1-V21 (Gotham 13.2): YES (must be ok cause TBS is using the box for their SAT tuner modules)
2. OpenELEC-imx6.arm-devel-20141212185955-r19776-g15f1597 (Kodi): NO (this was my first build from this forum)
3. OpenELEC-imx6.arm-devel-20141220100538-r19822-gcb503e2-Gotham: YES (this was the first special build for me)
4. OpenELEC-imx6.arm-devel-20141220222111-r19822-gcb503e2-Gotham: YES (incl. fix with MP3 issue but missing Web- and UPnP-server)
Funny: If I watch a 1080i movie with 4. and choose the film options, I get a menu with "Deinterlace Video" = Off. This is the default, even on interlaced movies and it works fine! If I choose "Auto" the audio is chopping (unusable) and the video is stuttering. So there is no reason to distinguish between "i" and "p" material as long as this option is off.
If it's not possible to have 4. WITH Web- and UPnP server, I would like to close this discussion and switch back to matrixtv (1.), waiting for official Helix version for matrix. I have spent money for this nice little and powerful box and hope that it gets more popular in the OpenELEC scene. Thanks for your patience!