Dear Prog!
This answer too simply. In K-Lite Codec Pack is an pretty tool: the Codec Tweak Tool. This is listing all codecs, are in the system, for example:
Description: Moonlight H.264 Video Decoder
File name: c:\program files\common files\moonlight\h264dec.ax
CLSID: {04B31EE9-EC66-4CED-8FF4-A9E7E22D1D8B}
Merit: 00800100
Description: MainConcept AVC/H.264 Video Decoder
File name: c:\program files\mainconcept\dtv decoder pro\mcavcvd.ax
CLSID: {96B9D0ED-8D13-4171-A983-B84D88D627BE}
Merit: 00800001 = MERIT_PREFERRED + 1
Description: CyberLink H.264/AVC Decoder (PDVD7.x)
File name: c:\program files\cyberlink\powerdvd\videofilter\cl264dec.ax
CLSID: {F2E3D920-0F9B-4319-BE87-EB94CCEB6C09}
Merit: 00600400
Description: CoreAVC Video Decoder
File name: c:\program files\corecodec\coreavc professional edition\coreavcdecoder.ax
CLSID: {09571A4B-F1FE-4C60-9760-DE6D310C7C31}
Merit: 00600000 = MERIT_NORMAL
They are in this list only the h.264/AVC Video Decoders, I don't write other mp4/mpeg-4 codecs, and the DVBPortal HDTV TS Pump/Dump codecs.
Must out of these more too? I don't understand, why not HD broadcast in your excellent and lovely ProgDVB software, dear Prog?
I wait for your answer with increased interesting.
