Remuxing M2V with a different frame size

[cosmin]

Hi,

Given an M2V recoded at a different frame size than the original (e.g 352x480 instead of the original's 720x480), how can it be remuxed into the original VOB?

I will appreciate tips and pointers to 1-click software solutions that do this (if such things exist...) as well as magical IFOEdit incantations.

Best regards,
Cosmin

[TeeeRex]

Need to understand what you've after here - are you saying that you have a M2V video file which has been encoded at half D1 and you just want to mux it back into VOBs ? - If so, then as long as it's a legal DVD size then use any Authoring package to do it - Ifoedit is free and will do it fine - It even mux's non legal resolutions without complaining ....

If you are asking to remux 'part' of it back into the original VOB, then I'm pretty certain the answer is no - this cannot be done. Different titles, yes, but the same title no.

I hope this helps ...

[cosmin]

I wanted to replace the whole D1 video stream with a half-D1 one, without reauthoring. Otherwise, I know there are plenty of reauthoring choices, as long as the video stream has a valid resolution; and I also know that I cannot replace just a cell, because the resolution must be the same along the entire titleset.

I thought it is possible to remux the M2V into the VOB, then update the resolution information in the IFO.

For example, I noticed that VTSI_MAT has a section "video attributes of VTSM_VOBS", which contains a "source resolution" field. You are right, I did try to edit that field, and IFOEdit told me "Item is not editable".

Is there a technical reason that makes the editing of the "source resolution" field (and possibly other resolution-related fields) impossible, or is it just not implemented in IFOEdit?

[TeeeRex]

Hi - you can change resolution in the VTS_01_0.IFO faily easily (in the root structure) by just changing the title set resolution - save and go back in again. Then the resolution in the VTSI_MAT also changes (must have a pointer to the main resolution here I assume).

Not sure if this will work though as my tinkering with IFO's is limited to getting subtitles working ...

Good luck ...

[DoubleShadowIce]

@cosmin

Maybe this could help.

[cosmin]

I'll try TeeeRex's advice, maybe this weekend, and I'll let you know if it worked - combined, of course, with the steps outlined in 2Cool's remuxing guide.

I believe that, by strictly following 2Cool's guide, without adjusting the resolution info, a non-standard titleset will be created. It might work in some DVD players, for the same reason why titlesets with SVCD resolution (and who knows what other non-standard stuff) work, but that's not a guarantee.

Thanks for the tips, guys!

[cosmin]

Report: It Worked!

I changed the resolution info in the root structure of VTS_0n_0.IFO and VIDEO_TS.IFO easily, with IFOEdit, and I remuxed in the new M2V at the new resolution, by following 2Cool's guide.

Two pieces of advice:
- Make sure your new M2V has the same GOP structure as the original. Clicking on the "Rebuild PTS option" won't help - well it didn't help me. The resulting video stuttered badly.
- If the VOB has subtitles, they will remain at their original resolution. My set top player (Panasonic DVD RV-32) played them just fine, but my version of CyberLink PowerDVD (4.0) showed them at double size, ugly and getting out of the screen. It's possible that a VOB in which the M2V and the subs have different resolutions, is out of spec (... but can anyone confirm this?) - so make sure it will play fine in your player, if the subs are important to you (if not, you can strip them out).

Thanks again for your help.