Special treatment for credits?

[LigH]

Dear DVD2SVCD developers and pro's:

In the German doom9 forum, the question just came up if it would be possible at all (and if yes, how easy) to handle credits in DVD2SVCD differently, just like GordianKnot and XviD allow this. Because the text has sharp contrasts and motion, it will probably be encoded with much more bitrate than necessary. I just guessed that blurring this "scene" might help, unless the bitrate distribution handling could be changed (e.g. by tweaking the vaf file).

I hope you don't mind asking this question, but I'm not a regular user of DVD2SVCD, and I don't know how it works in detail, and if such changes were possible (maybe they are even already implemented, and I just missed that). So please be nice to me...

For those who understand German, there we talk about it:

http://forum.doom9.de/viewtopic.php?p=18977#18977

[markrb]

This was lightly discussed here before, but no hard conclusion came up. Personally I think it's too much work for it to be worth it in an Mpeg video.

Mark

[LigH]

Originally posted by markrb
Personally I think it's too much work for it to be worth it in an Mpeg video.

I absolutely cannot agree with that statement - especially the strong limits for bitrate in SVCDs will make people want to spend bitrate more into movie scenes than into credits.

I hope that the developers can tell me later, if bitrate regulation is possible without splitting and joining the movie, and if the blur filter idea may rather help or hurt. But after all, this is not an urgent topic... See you!

[RB]

What's wrong with just cutting off the credits in frame selection?

[LigH]

Some don't like to "castrate" a movie. Some may like the music during the credits. Who knows. It might be an option, but probably not for everyone.

BTW: It's not my problem. I'm just asking here for those of our members who are not so good in English, or too lazy to try (eager me)... :D

[Tobytl]

Well, you can tweak the bitrate for certain areas of the video in cce by adjusting the local bitrate settings. But, the problem (I would think) with this is that not many understand the way stuff like that is stored in the ecl or vaf or wherever that stuff is stored. Maybe some do, you guys could be geniouses for all I know, but I would think it is difficult to say the least...

[markrb]

I feel that credits are about 5 minutes of a 2 hour movie. Even if you drop their bitrate by half you are not going to gain alot in the big picture. So by reducing those 5 minutes you gain(I am guessing) about 20Kbit(even if it's 50kbit) for the rest of the movie. Not worth all the extra effort that DVD2SVCD would have to do if it's possible and if it's not easy.
It might be able to be done and some have suggested that you cut them off, encode them seperately and then attach them back on. I have not tried this so I have no idea if it will work.

However I am not the one that has to decide if my time is worth exploring this and I don't know how easy it is to implement or if it's possible. If it's a fairly easy thing to add to DVD2SVCD then I say go for it, but I have not seen anyone come up with a manual way to do this with CCE or TMPG either. It might be there, I just have never seen it.

When I have some time I will take a typical movie and encode it at full bitrate throughout and then using frame selection or chapter cutting I will remove and encode sepertely the movie and the credits to see how much of a bitrate increase it would be, but it may be next year before I can do it because I am going away for Christmas this year.

Mark

[chainsaw135]

Well like anything else around here, if someone wants to do tests it would be interesting to see the results. I myself find it to be a waste of time but hey if someone wants to do such a project more power to you:)

[LigH]

There are movies with more than 10 minutes of credist - I even read about one with more than 20 minutes. And all those credit minutes encoded with more than 2000 kbps, where 500 might be just enough... So why is the same effort worth in DivX movies, but not in SVCDs?

But you are right: If anyone is willing to run a test, he shall at least be able to try it; finally, it is the only way to prove a concept.

[ux-3]

Originally posted by LigH
Some may like the music during the credits.

Actually, I suggested this here before. It is possible to have the movie end but the music continue. Saves most bits too! Might require an edit and resume in muxing.