HR HDTV Conversion?

[bgmille]

Trying to convert a HR (High Res) HDTV XVID file to be able to play it on my DVP642. Using VirtualDub MOD and unable to convert to DIVX as DIVX does not support the input file being HR. Am able to convert using XVID codec but unable to figure out how to change the resolution in the XVID properties using Virtualdubmod so that my DVD player will play it. As the DVP642 gives error "Resolution Not Supported". Please help thanks!!

[junkmalle]

VirtualDUbMod:

Video -> Full Processing Mode
Video -> Filters...
Add -> Resize Filter
Set desired width and height, Lanczos3

[Soopafresh]

Your target file must be less than 720x480 in dimensions. Be aware of the GMC Qpel issue as well (do a search on DVP 642 and QPEL).

[bgmille]

Very cool...you guys are quick. Works like a charm now after testing. However, i need to choose a proper size. I did 720x480 but it made the wide screen full. So what would be the proper size if my starting file is 960x528?

Thanks again!!

[MoovyGuy]

Hey Guys,

I do not want to highjack this thread, buuuuuuut, what i have been trying to do is, using raw .TS 1080i or 720p files, encode them in to the HR HDTV format that has become quite popular online.

Can anyone help?

Moderator: Please feel free to break this out in to a new thread if you think it warrants it.

Thanks

[junkmalle]

Keep the proportions the same:

720 * 528 / 960 = 396 --> 720x396

or:

640 * 528 / 960 = 352 --> 640x352

I'd go with 640x352 to be on the safe side.

To speed up compression you can use Xvid in Quantization (constant quality) mode. Pick the quantizer value you want and encode in a single pass. At Q=2 there will be hardly any difference between the input and the output, even when viewing enlarged still frames (some players may have problems with the high bitrates this setting can create -- the DVP 642 with 640x352 should be OK). At Q=3 you can see a little macroblocking in enlarged still frames but won't notice them at normal playback speed. At Q=4 you can see a little macroblocking at normal playback speed. You can use decimal values like 2.5 too.

The final file size is hard to predict in Quantization mode. You can get an idea by watching the estimated file size in VirtualDubMod's status dialog.

[junkmalle]

what i have been trying to do is, using raw .TS 1080i or 720p files, encode them in to the HR HDTV format that has become quite popular online.

If you can play them from Media Player (that is, if you have the proper codecs installed), install AVISynth and you can open them directly as Direct Show Sources with VirtualDubMod. Or you can create a simple AVISynth script to open them with VirtualDubMPEG2 or VirtualDub:

#ASYNTHER DirectShowSource
DirectShowSource("E:\Video\1920x1088.tp")

720p is no problem but you'll have trouble with 1080i because there are no players (as far as I know) that properly handle interlaced Xvid or Divx files. Inverse Telecine if possible. Otherwise you can try using a Smart Deinterlace Filter, and maybe follow that with a resize to 1280x720 (because reducing the size helps hide the artifacts that deinterlacing can introduce).

[celtic_druid]

I'd suggest using DGIndex/dgdecode rather than directshow source. I would also use AVISynth for the first problem with the avi re-encode since resizing with VDub means converting to RGB24.

XviD is a video codec, therefor it doesn't have resize, etc. filters. DivX is an exception in that regard. Such things don't actually belong in a codec.

With constant quality mode you may run into bitrate spikes. With two passes you can enable a Home Theatre profile which will not only prevent bitrate spikes but disable features like GMC.

[MoovyGuy]

Hey Guys,

Thanks for the tips, I'll give them a shot this weekend.

Da moovyGuy