Remux with Ifoedit gives jerky sound and video

[tigrilito]

Hi all,

I'm trying to replace the video of a motion menu with my own m2v and am running into trouble :-(

Basically I followed the guide at http://www.cdr-zone.com/guides/dvdremake_guides/dvd_remake_guide_1_page_1.html to copy the pgc from the menu domain to the title domain (keeping the buttons and subpics). This worked perfectly well, I can watch the video in WMP without problems.

Then I open the IFO in Ifoedit and use Vob Extras to remux my own m2v stream using these options :

Re-Mux
Correct Vob-Unit (Nav Pack) pointers
Correct original IFO files
Adjust VOB-Unit pointers
Adjust Audio/Sup pointers
Auto Copy menu files

But when I watch the result I get really jerky sound and video... it plays, stops for a split second, plays a bit, stops again and so on...

Any ideas why this happens ?

BTW I also tried remuxing with Vobedit but this one does not correct the NAV pack pointers which causes DVDshrink and Pgcedit refuse to load the DVD.

[Matthew]

The video (new vs old) have to be identical in some respects (namely GOP structure), so you can't just remux back in any old stream, or even the same stream re-encoded. This is why people have to reauthor to make a high quality backup of a DVD.

[2COOL]

I hope this helps. I made this guide (http://forum.doom9.org/showthread.php?s=&threadid=66964) a while back.

[goonix]

Or you can try this mini-guide: http://forum.doom9.org/showthread.php?t=99306
I have successfully replaced the video of a motion menu with my own. Your new video only has to have the same aspect ratio, the length can be different.

goonix

[tigrilito]

Thanks everybody for the suggestions !

2Cool, what I did so far is pretty close to your guide but to be sure I followed yours exactly and get the same jerky result.

Goonix, I'll try your method tomorrow and will sure let you know if it worked for me.

Matthew can you please explain why the new video must have the same GOP structure as the old ? I thought remuxing would correct all data structures or create brand new ones.

Thanks again,
tigrilito

[Matthew]

tigrilito I'm no guru, ask that question of mpucoder :)

Just remember, motion menus are similar to movies, and do you see people making full backups by remuxing CCE m2vs back in using IFOEdit? No - they've only done it when using transcoders like REMPEG, ReJig, etc. Hence all the hassles with the big 3 etc, and the complexity of DVDRebuilder.

If you look at Zeul's app, NuMenu4u, he reauthors the menu using Scenarist or MuxMan. Just as goonix seems to do :)

[Sir Didymus]

While waiting for some answers from the gurus, my experience is that performing the remux of m2v files with Rejig, Ifoedit, and other applications (especially the ones based on the open source code of mplex) leads to severe infringements of DVD specs and buggy results.

These applications are not including a functional Video Buffer Verifyer model.

This is the reason why remuxing (with these applications) m2v assets having exactely the same GOP structure as the original may help in reducing the troubles.

This fault, with the related limitations, does not apply to MuxMan and to Scenarist, which are both fully compliant with the VBV model.

For this reason I strongly suggest everybody to follow the approach and the guides based on Muxman or on Scenarist for the authoring.

OT --> By the way, the guide of goonix is excellent, so, many complimets to the author for his guide!!! [there is to say he never will reach the sidereal level of 2Cool: their mervellous guides comes directly from another planet... ;) ]

@tigrilito. I guess if you follow the approach described by goonix your troubles will terminate... Please report your further findings...

Cheers,
SD

[Zeul]

Thereotically remuxing the video stream back could work. Important things to consider are the max bitrate of the video stream. The video max is 9.8Mbps (different for Angle projects) (combined with any overhead will give the absolute max of 10.08Mbps). However the max includes audio also. So, 9800 - audio bitrate (normally 448 for 5.1AC3) = 9352. Set that as your max bitrate (or just under to be sure). Next thing is your chapter placement (essential for BOV and Menus). This is real tricky in a menu. In a title any IFO editor will output the chapter frame# that you can feed into CCE (not prododer though). Off the top of my head i don't know of any editor that will output the chapter points for menus. You will need to calculate them yourself. Open every menu PGC and look at the cell playback time. If you are in PAL land easy, 25fps. NTSC is way harder. First you need to adjust for drop frame, also for pulldown if using 23.976fps and not 29.97. TBH is it worth the hassle?? An alternative approach is to use a transcoder that can ouput the GOP sequence and then feed that actual structure into TMPGenc, with you're new video stream.
I played with a variety of methods of remux in the early days of NuMenu, but nothing worked that well. Only surefire way was reauthoring with Scenarist or now Muxman.

[tigrilito]

Better late than never... I finally found time to go through goonix's guide and it worked like a charm (but it took me quite some time to figure out the name of the bmp in the .sst file MUST be followed by a space for muxman to work correctly... maybe you can add a note to your guide so others won't run into the same trouble).

Now I just need to figure out how to make it work for a menu cell that has several button sets....