These will be included in future release of MP, dropping mpa\mpv codecs, the internal discussion seems to be in favour of this change, could be in MP1.3x, this would at least allow most files to play out of the box.
My suggestion is to use the MS DTV/DVD Codec for MPEG2 and H.264 in LiveTV, since you are on Windows 7.They work really good. I only noticed some problems on the HD channel "Servus TV Germany HD". It will show no picture when switching to this channel. Other HD channels work.