What about a matrix varying based encoder?
Hi,
As varying some value in a matrix can cause blurring, would it be posible to make an encoder which vary the matrix acording to vectors, using a blurrier version with high motion vectors, and using a normal version in less motion zone? Or the mpeg2 specification don't allow to vary the matrix within a mpeg file? Thanks, Fabrice |
This encoder has already a name : CCE 2.70 (adaptative Q-Matrix feature that must be unselected to do KDVD by the way).
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Hi,
So someone already think about that before... I came too late! :-) What about the quality? And why do you have to uncheck this to do KDVD? I'll download the trial version to see it , and if it's a interesting feature, ask Hank if it will be posible to modify HC to do that, ... ( or have, at least, a proof of concept version). Salu2 Fabrice |
I think that a dynamic matrix would be a geat idea, but I'm not sure it would work on all standalone players.
The reason is, that probably many players read the first header of the MPEG file, and set the decoder accordingly. If a standalone decoder uses that first matrix as a reference for the complete movie, and the matrix in the movie varies on every header segment, the result will be a decoded mess :!: -kwag |
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Hi,
According to CCE user guide: Quote:
Is there a way to get a file, with multiple matrix, to do a DVD test? (without encoding each GOP in a different file, with a different matrix, of course). The only problem I see, is that if the matrix can only be put at gop level, we will have the same problem with moving object in front of a static area we had with optimal script: loosing all static area details... Salu2 Fabrice |
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Just encode four or five 1 minute clips, each with a different matrix, and then join the MPEG files together as a single large file. Then see if there are hickups on a standalone. :D -kwag |
Hi,
I'm not sure it would do the trick, because it don't seem that the matriz is always present in the Sequence header ( http://dvd.sourceforge.net/dvdinfo/mpeghdrs.html ), so merging the files only would give me a first matrix, but no sequence matrixes... Is there any tool I can use to confirm that? (o should I write my own mpeg header parser?) Salu2 Fabrice EDITED: I found Mpeg parser, and I confirm that the "load Intra quantiser Matrix" flag is on with hc and cce. The only problem is that I can't see the matrix used in each Sequence Header, just to be sure that merging the 5 files won't erase this 'local' matrix. |
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