Not transcoding VOB's with IC possible?

[markrb]

If I want to keep some VOB's not touched at all while transcoding others is it possible with IC?

If I set the quality to 100% does it still do something to the VOB's attached to that section or does it simply copy them over?

In my particular case I want IC to work on the menu's, but I would rather work on the main movie the hard way.

I did a quick search, but could not find exactly what I was looking for.

Thanks,
Mark

[int 21h]

It will just copy them over. A real fun thing to do is set the movie to 100%, compress all of the extras and menus, make the image, and then use CCE to compress the main movie. Obviously you'll have to use the F5 or registry trick to get it to copy since the output will be more than 4.13 GB or whatever.

[Fmazzanti]

Are you 100% sure it doesn't do anything?
One 'nice' thing I've experienced here is that copying uncompressed menues sometimes produces strange 'holes' in the menu images where you can see part of other menu behind. It's crazzy but it happens... and I'm not the only one experiencing this. So I'm pretty sure it is simply not true that it just copies uncompressed vobs...

[djadjet]

Setting quality to 100% only ensures that video stream won’t be touched. Vobs might get changed depending on other settings. If you strip audio and subtitle streams or remove user prohibitions vobs will definitely get changed, including their navigation packs (that may explain “holes”???).

The resulting VTS can be processed and encoded with CCE, once extras have been compressed, but I would recommend to use the original main movie VTS for CCE treatment and incorporate resulting VTS back into compressed structure.

[red321]

Setting the main movie to 100% does not guarantee the VOBs will not be transcoded. I have found that the only way to stop the VOBS being transcoded is to ONLY change the size of the Main movie to 100%, but not change any of the extras. e.g;

Auto ->
Main movie 63%
Extras 63%

Manual Change -> Which causes No Transcoding
Main movie 100%
Extras 63%

Manual Change -> Which causes Transcoding
Main movie 100%
Extras 30%

I have tested this on both the .91 version and the recent 114 (?) update. Its easily checked by looking at the speed the MAin movie Title is processed. On my system transcoding is about 1MB/sec, and no transcode it 10MB/sec.

[djadjet]

@red321

Demux both of vob sets from your examples and compare video streams (m2v files).

[red321]

Why ? What did you want me to see :confused:

In the first example, setting the video to 100% takes 10 minutes to copy disk to disk.

In example 2 the video is transcoded and takes 2 hours.

You can do it on a really short sample and get the same effect. As long as you only change 1 title/Vob to 100% it will do a straight copy or strip. If you change any other title at the same time, it will transcode. The change in quality is probably not noticable, but the length of time taken is !

[djadjet]

@red321

All I’m trying to say do not presume things, they are not always as they seem.

[red321]

Ah a scientist ;)

Ok If you do try what I suggested, and then demux the video

On a 238M test title, the result of increasing the compression to 100% but leaving all other retained titles at default resulted in a 238M title (COPIED). If you changed any other title, the result was 208M (TRANSCODED).

So looks like a bug to me. I dont know of any workaround that will allow you to move the main title to 100% and choose the compression of the extras to suit, and avoid transcoding the main title. If you come up with one I would be keen to know. :)

[djadjet]

Just painful experience (even worse, multiple experiences)

10%+ difference is quite a bit.

I use this method to squeeze the menus and extras from stripped DVD9, where main movie can fit on DVD5 without transcoding, but overall structure that I like to keep is a bit bigger. I do not transcode with IC7 (re-encoding fan where it’s important) because it strips MPEG2 user data, namely closed captions (NTSC thing) during the process (even at 99%). However when you set the main movie to 100% (and rebalance the rest to fit with some oversize) all of the MPEG2 user data is still in the stream. Strange….

There are some other things, apart from user data, that can be left out of MPEG2 stream, but that is nowhere near 10%.

Is your test multiple PGC and angles?

[djadjet]

@red321

I couldn’t reproduce your problem on both of IC7 installs I have(.114). No matter what I do with the rest of titles, the one set to 100% video stream stays the same even for complicated titles with multi PGCs, angles and seamless branching.

And it keeps mpeg2 user data, too.

[red321]

hmm,
thanks for trying it. Absolutely definately certain that if I change any other title I end up with a transcode not a copy of the main title when the main is set to 100%.

Glad you dont have the same problem :D , but dont know why I do ! :mad:

[int 21h]

I have compressed 3 or 4 movies' extras, leaving the main movie at 100%, then later transcoding the main movie with CCE, and had no problems at all. Watching the preview windows shows just extras information, and you can easily tell when its transcoding compared to just copying over.

[djadjet]

Same here!

[red321]

Obviously this program just hates me :( :(

:D