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Join Date: Jan 2002
Location: Detroit Metro Area
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Following up the conversation here...
It is possible to make a Blu-Ray using the VC-1 encode from the HD-DVD, the DTS-MA lossless audio from the BD, and the subtitles from the BD. You can extract the VC-1 video stream from the HD-DVD with eac3to which will remove the pulldown flags and give you a 1080p24 stream (TSmuxer doesn't do it correctly). You can demux the audio and subtitles from the BD with a variety of tools (like TSmuxer or eac3to). Then use TSmuxer to combine them all back together into a movie only BD. You will need to apply a negative delay the audio of about 400ms or the audio and video will be out of sync in the resulting output.
If you want to keep all the special features, extra audio streams, etc..., and the menu of the BD intact that's probably possible also, but I didn't attempt that.