Can I decimate a DVD with RB-Pro?

[phædrus]

Source material is not a commercial DVD. It is a TV show recorded from HDTV stream, then reduced to a DVD. Original material is film rate, but the DVD is 30 progressive fps (29.9xx). There is no combing -- it is not hard telecined. It is IVTC'd without the decimation. So that means four frames and then a repeat, right?

I've read the forum questions on DVD-RB regarding IVTC, but none that I know of dealt with this kind of situation.

If I put the Decimate() command into the AVS script, will this work to get things back to a nice smooth film rate without frame repeats? If not, why not, and why isn't there a workaround?

[steptoe]

You should be able to use any filter, script or function that AviSynth can use in DVD-RB

I've tried loads over the past couple of years with no problems, other that the usual trying to work out what filters need to run as I found out when some filters refused to work correctlt until I changed to AviSynth 2.5.7, which does work fine but apparently has some issues when using certain resize filters


I'm also playing with RemoveDirtMC which is quite a complex and very slow function that calls a few filters and functions from within itself, after a bit of fiddling got it to work perfectly with DVD-RB and also the plugin that forces filters to use multiple cores if you have them

So, in that respect DVD-RB is very compliant with filters and AVISynth


For a possibly better alternative to decimate try the link to the 'decomb' filter that basically does it all for you and offers a lot more control

http://neuron2.net/decomb/decombnew.html

Bear in mind some filters and especially functions can be very slow, especially functions by Dede, but the final quality will usually be much better and worth the wait

If you're not aware of it, also check this link, it has a ton of information for AviSynth and plenty of help if you need it

http://forum.doom9.org/forumdisplay.php?f=33

[kumi]

I think you should be OK with any filterchain that returns the exact number of frames of the original source. Jdobbs has warned repeatedly about using any filters that modify the framecount.

[phædrus]

I think you should be OK with any filterchain that returns the exact number of frames of the original source. Jdobbs has warned repeatedly about using any filters that modify the framecount.

That's just it, isn't it? Because if I decimate every fifth frame, that will change the framecount, I would think.

Perhaps what I really need to do is somehow change it back to the original interlaced, telecine pattern of fields. But my AVS filter knowledge is not great enough to accomplish that.

I suppose I could try a test overnight and see what happens. [crosses fingers]

[setarip_old]

@phaedrus

Hi!Source material is not a commercial DVD. It is a TV show recorded from HDTV stream, then reduced to a DVD.Perhaps what I really need to do is somehow change it back to the original interlaced, telecine pattern of fields. But my AVS filter knowledge is not great enough to accomplish that.Why don't you simply once again work with your original source material, the TV capture, that's already in the form you desire?

[Incognitoid]

heh well i just did something like this recently to be honest. like the post above previously said, if you're going to decimate, rebuilder will most likely have a problem with it because of the incongruent frame count.

you'll have to do it manually with cce. basically i created a .d2v project with dgindex then opened that up in gordian knot (helps for the avs script challenged). Made sure all the parameters for resolution and such were the same as the original and created my .avs file and made sure no filters were applied that i didn't want. Then i tinkered with the decimate line using mode 0 (my source was hard telecined). opened up in virtualdubmod to check to see if the fps was correct and the framerate was smooth. when i was satisfied i opened up the avs file in cce and plugged in my bitrate settings etc...even applied 3:2 pulldown to get back to 29.97 fps. After i got my mpv file i muxed it with the ac3 file in tmpgenc dvd author to get my vobs.

integrating the final output with the main dvd was a little trickier. i happen to have dvdremake pro and that made it kind of easy. chapter menus were tricky though as the frames were now off a bit, had to adjust those manually.

[phædrus]

@phaedrus

Hi!Why don't you simply once again work with your original source material, the TV capture, that's already in the form you desire?

This particular TV capture file -- after processing with MPEG2Repair -- was so corrupted in one spot (the rest of it appears to be faultless) that even DGIndex couldn't parse it. However, HDTV2DVD was able to get through the .tp file make the DVD files. I used DVD Shrink to edit out the bad part and make a new folder with all the proper VIDEO_TS files in it.

I deleted the original (corrupt) transport stream file. What I've got is what I've got. And what remains needs to be decimated or else telecined for best results, because that is the way HDTV2DVD puts it out, and there are no controls for that software. You get what it gives you (30p) and you will like it!

I had a thought this morning, perhaps I could decimate, bringing it down to film framerate, and then if there is a command to telecine the progressive frames, the framerate would be back to the normal video framerate, and DVD-RB would process it correctly. Unfortunately, I've never telecined anything. What AVS command might work for what I'm trying to do? I'm willing to try any suggestions. Thank you for your patience.

I understand the DVD-RB Pro was made to remake DVDs, not transport streams, or even DVDs sourced come from HDTV transport streams. Still, what I have are DVD files, and I hoped DVD-RB would work for me to rebuild them with a slight modification.

[manono]

I'm willing to try any suggestions.
Why beat your head against a wall? Encode it outside of DVD-RB, along the lines of what Incognitoid suggested. What's so hard about that? Why anyone would seriously consider retelecining progressive material to encode as interlaced 29.97fps is beyond me.

[phædrus]

Why beat your head against a wall? Encode it outside of DVD-RB, along the lines of what Incognitoid suggested. What's so hard about that?

Because I don't have tmpgenc dvd author or dvdremake? I understand what I am suggesting is not ideal. But it did seem like it might be the most direct route from the source to the end product I desired. Never mind, I'll just fumble around myself until I find a way to do it.