Convert 1080p HD DVD to 720p

[cx2]

okay, i've managed to backup a few hd dvds now using the 360 hd dvd drive and backuphddvd, the trouble i have is that my htpc has a celeron d cpu @ 2.8ghz, not quite fast enough to playback 1080p hd dvd content.

is there a way to convert the files to 720p? my plasma will only do 720p anyway so i'm not likely to loose much quality and i'll save on hdd space too.

[Guest]

Just resize the frames using Avisynth or VirtualDub. You can also return it to film rate if you haven't already.

[cx2]

I'm far from being an expert when it comes to video encoding, and I'm probably missing something obvious, but i can't seem to get VirtualDub (v1.7.0) to open either the .evo files, or even the demuxed .mpv file

[Guest]

You said you had already backed them up so I assumed you had made an AVI. VirtualDub MPEG2 will open M2V. You can also use DGMPGDec to serve the M2V via Avisynth.

[cx2]

thanks i'll give that a go, once i've got the files in avi format i'm happy, it just seems few programs can handle hd dvd content at the moment

[JeffAlso]

If your using drmpeg's EVOB demuxer (http://forum.doom9.org/showthread.php?p=948324#post948324), the file produced is most likely not an mpeg2 elementary stream, but either an h.264 or vc1 stream. The file extension is always the same regardless of the actual type being demuxed. DGMPGDec doesnt handle these streams.

I've been trying various techniques and methods to do essentially what you are trying to do, but there are still (at least) 2 major problems.

So far every technique loads the video into avisynth using the DirectShowSource() plugin. Unfortunately, this plugin misrepesents both the framerate and framecount of the video, as well as screws up seeking at the end of the movie.

The second problem is that HD DVDs use e-ac3 rather than ac3 audio, and there is currently nothing that can decode the e-ac3 stream properly (although work is apparently being done on ffmpeg and ffdshow to provide this).

I suggest following http://forum.doom9.org/showthread.php?p=945917#post945917
and http://forum.doom9.org/showthread.php?p=933649#post933649 for updates.