Chapters

[Spaceone]

I used hc encoder to compress m2v file and then with ifoedit authored new dvd. But (ofcourse) my chapters points are way off.

Is any way to modify those chapters points to fit with new compressed movie? Or must I use some other encoder, which has abbility to import original points?

[mic]

I've been hoping someone will give you specifics -- I've run into this but it's been so long I don't remember that much about it. I think one way was to alter the chapt. index text file in something like ChapterXtractor, & I think in a couple of cases I Shrunk the video, remuxed it using ifoedit, & when I corrected in edit afterwards it took care of chapters. I'm pretty sure there are simpler methods though, and really am only posting this in case you need something today, & this might be better then nothing. You might also check out the thread here: http://forum.doom9.org/showthread.php?t=98927

Hope it does some good :)

[Spaceone]

Thanks for link, but I allready saw that before and it didn't help me really.

Anybody knows, if it's possible to retain chapters and compresing movie, with this method?Robshot - Bach method aka RoBa (http://doom9.org/mpg/cce-roba.htm) (if somebody tried it)

[SeeMoreDigital]

Without knowing exactly what you are trying to achieve, it may be difficult to help you!

For example, if you're intending to "back-up" and re-compress just the movie section of a DVD you could use the following method: -

01 - Rip the DVD using DVD Decrypter, in "IFO mode" with "Stream Processing" and "IfoEdit Chapter Information" text file
02 - Re-compress your MPEG-2 .M2V source stream using say, DVD Shrink
03 - Use MuxMan to re-mux your re-compressed MPEG-2 video stream with your AC3 stream and import your "Chapter Information" text file...

After a few moments MuxMan will generate an entire set of DVD compliant VOB and IFO files, suitable for burning to a blank DVD~R/RW


Cheers

[Spaceone]

SeeMoreDigital
03 - Use MuxMan to re-mux your re-compressed MPEG-2 video stream with your AC3 stream and import your "Chapter Information" text file...

What I did:
- with pgcdemux I demuxed movie and also get celltimes
- compressed movie with hc encoder
- authored new dvd with ifoedit (where I imported those celltimes)

But when you import chapters information (with muxman, or ifoedit, as I did), those chapters points don't point do the right movie scene (because movie is altered - compressed)


Just to be clear: celltimes are chapters points, right? :)

[Dimad]

You can insert chapters in authored DVD with DvdReMake Pro: http://www.dimadsoft.com/dvdremakepro/ht_insert_chapter.php

[Sir Didymus]

...But when you import chapters information (with muxman, or ifoedit, as I did), those chapters points don't point do the right movie scene (because movie is altered - compressed)


Just to be clear: celltimes are chapters points, right? :)

When you compress a movie, just the bitrate (i.e. the size) changes; the duration (i.e the number of pictures), and the related chapter points should not change due to the recompression...

In other words: the sizes change, the times does not...

Celltimes are chapter points, expressed as frame numbers...

So if your chapter points are scrambled, the trouble should be elsewhere in your process...

Cheers,
SD

Edit: also, in the second step of your process - the encoding - you should inform the encoder about the chapter positions, in order to ensure I frames are generated matching the start of each chapter...

[SeeMoreDigital]

MuxMan requires chapter information to be presented as a "frame based" list... like this: - 17990
35978
53951
71932
89922
107890
125877
143861
161841
179817
197805
215779
233761
251748As each frame number represents an exact point in time, even when you re-compress your movie they should point to exacly the same point in time!

But how complicated do you want your DVD back-ups to be? Mine are just the main movie with audio and chapters. Sometime's I might include more than one audio track... but that's about it.

Afterall who needs menu's when a back-up is this basic?


Cheers

[mpucoder]

The chapters shouldn't be off by more than a few frames after re-encoding. This is because chapters have to start on an I frame, and these will be in different places unless you use an encoder that can take a list of I frame points.

[D3s7]

until the latest version, hcenc did not support forced chapter locations...

it's very possible your scene locations are off by 15/12 frames or more as your scenes will only drop on I-frames (as mentioned)