Aspect Ratio of DivX certificated Home Theatre

[apollo16]

In my opinion is a good idea to improve this program with possibility of multi pass encoding (or at least : two pass encoding).
In addiction my opinion is maintain in the DivX created the original DVD dimensions 720x576. Now user can choose the parametre 720 but not the second that is choosed from program.
The DivX certificate tell that the standard of DivX dimension for Home Theater is: "720x576 NOT CROPPED" in order to obtain movie Mpeg4 compatible with all DivX/DVD player certified that are for sale with original DVD aspect-ratio.
When user realizes its DivX movies, are also correct to permit he to keep Aspect Ratio Output equal 4:3 VC/DVD or 16:9 or VGA (The choice is of user and not from program), as other program do (for example Flask 0.78.39 - Xmpeg 5.03)

Thanks
Best Regards
Andrea

[manono]

Hello, and welcome to the forum-

I'm having some trouble understanding what you're saying.

In my opinion is a good idea to improve this program with possibility of multi pass encoding (or at least : two pass encoding).

It is only possible to do 2 or multi-pass encoding through GKnot. It doesn't even support single pass encoding.

In addiction my opinion is maintain in the DivX created the original DVD dimensions 720x576.

If you want to do that, then just choose 1:1 under Input Pixel Aspect Ratio. If you play it in a software player on a computer, you can resize it correctly (4:3 or 16:9). But if you intend to play it in a standalone DVD/MPEG4 player, then you had better crop and resize to a proper resolution, as I don't know of any standalones that can resize an .avi for 4:3 or 16:9. I think some may be on the way, though. But if you then resize that 16:9 720x576 .avi in the DVD/MPEG4 player, the resolution will be too high for any standalone made today, although, again, some are on the way that can playback even HD resolutions.

But if I've misunderstood you, then please set me straight.

[apollo16]

I have encoded a movie with GKnot and I have compared it with original DVD.
The paremetres choosed is 720.
I have saw that the image with original aspect ratio of 2.35:1 in the divx resulted is cropped.
In fact the extreme left and extreme right of the video in the DVD are showed object that in the DivX encoded are cutted.
Using Xmpeg or Flask in mode original NOT cropped all the aspect of the movie are encoded.
I hope that you have understand what I'm looking for explain.

Where I'm wrong??

ThanksAndrea

[manono]

Hi-

OK, I think I understand. You made a DivX for 720x304, maybe, and you are saying that GKnot cropped from the right and left sides a few pixels into the video. Well, after cropping away all the black bars, it is sometimes necessary to crop into the video to achieve low Aspect Error (if you look below the crop numbers, you'll see the Aspect Error box). So how did you crop it? With the Smart Crop, maybe? Then you lose control over what gets cropped. Try this; use the Pixel Crop instead, and crop away all the black bars, and then, keeping an eye on the Aspect Error box, crop some more, either from the top and bottom, or from the left and right, so that the Aspect Error goes below 1% (you should be able to easily get it down close to zero). If you don't care about Aspect Error, then just crop to the edge of the video and stop. But I don't recommend doing that.

[apollo16]

I want realize a divx movie without cropping.
All the movie original dimension.

Best regards Andrea

[SeeMoreDigital]

Originally posted by apollo16
I want realize a divx movie without cropping.
All the movie original dimension. If that's what you want to do. It's vital that you have an basic understanding of what an 'anamorphic' image is!

Have a look at this thread for more info: -

http://forum.doom9.org/showthread.php?s=&postid=485577#post485577

and again here, on my web site: -

http://SeeMoreDigital.net/03_Video_Info.html


Cheers

[manono]

Hi-

So I guess I never did understand what you did or wanted to do. The main reason I didn't understand is that what you want to do makes no sense at all. You said at the beginning that you wanted to play the .avis on a standalone DVD/MPEG4 player. But since there are none that I know of that can resize an .avi (they can only scale them), then if you do encode at the full DVD resolution, the picture will remain vertically stretched.

Thanks so much, SMD, for providing the pictures, which, as they say, are worth a thousand words. And make sure, apollo16, that you also check out the links that Soulhunter provided, particularly the second one, that goes to Doom9's article, Aspect Ratios Explained.

As for your missing pixels problem, I can only suggest that you check the .avs used for the encoding. Check the Crop line to see if anything was cropped. If it says Crop(0,0,720,576), then no cropping was performed. In fact, if you want to encode to the full DVD resolution, then edit the .avs and delete both the Crop and Resize lines.

[SeeMoreDigital]

Regarding 'standalone' players that can correctly display an Mpeg4 720x480/576 anamorphic image. Zhnujm, over in the 'Hardware Players' section has provided some information here: -

http://forum.doom9.org/showthread.php?s=&postid=481526#post481526

Your anamorphic encodes will have to be generated using the newest versions of XviD or 3ivX (complete with the required 'anamorphic' settings), which DivX does not have...


Cheers

[manono]

That's good to know. I haven't been paying much attention to that thread as I have a player with a different chipset, and as far as I know, there aren't any players available in the US with that MediaTek chipset. However, we will have some available soon with the newest Sigma Designs chipset, and I'm thinking seriously of upgrading mine.

Also, I think that Zhnujm burns his .avis to DVD-R, which makes a big difference in smooth playback when compared to burning to CD-R.

If you already knew all those things that SMD pointed out, apollo16, and have the right player with the right firmware and encode using XviD and set the 16:9 anamorphic flag, then I apologize for my ignorance and stubbornness.

[SeeMoreDigital]

Originally posted by manono
That's good to know. I haven't been paying much attention to that thread as I have a player with a different chipset, and as far as I know, there aren't any players available in the US with that MediaTek chipset. However, we will have some available soon with the newest Sigma Designs chipset, and I'm thinking seriously of upgrading mine.

Also, I think that Zhnujm burns his .avis to DVD-R, which makes a big difference in smooth playback when compared to burning to CD-R.

If you already knew all those things that SMD pointed out, apollo16, and have the right player with the right firmware and encode using XviD and set the 16:9 anamorphic flag, then I apologize for my ignorance and stubbornness. Just to help you salivate a little more, here's a link that hans-jürgen posted, detailing some of the proposed Kiss players specs: -

http://www.mpeg-playcenter.com/modules.php?name=News&file=article&sid=95

Personally I would prefer a networked player, rather than burning DVD~R's but I think my views about this might change now that +2GB support is available.


Cheers