resolution divx

surfer · Member Joined: 12 May 2002

I have a dvd which converted to divx resolution 720 x 576 PAL i believe. So i put several divx avi's on one dvd and play them on a portable dvd player in my car. When i play them however the screen is very small, it has also 2 black sides above and underneath the screen. Now i am tryiing to convert the divx into for example 720 x 480 to make the black borders away and make the divx full screen on the dvdplayer in the car. This isn't working very good though. I cannot configure the dvd player to play the video full screen. THe borders stay.

What is the best way to do if i want to look at the divx files full screen on the portable dvdplayer? Make the resolution 640 x 480? Is the quality goiing bad then?
It is a Solora dvp twin portable dvd player 7020.
I am using any dvd convertor to convert the dvd to divx. There is an option in this convertor: fit to width and expland to video size and round to 16 pixels, but i also tried the convert with these settings on?
I believe the Solora is a 16:9 player

Baldrick · Administrator Joined: 09 Aug 2000 Location: Sweden

I guess you have a 2.35:1 dvd. If you don't want any black borders you must crop the image to 1.77:1(16:9 and use a resolution like 640x360). I would use AutoGK and use the manually crop, see http://www.autogk.me.uk/modules.php?name=TutorialEN#6

(I assume your dvd portable has a 16:9 screen)

RabidDog · Old B. Joined: 25 Oct 2002 Location: UK

And please keep your speed down while watching Films!
You should get a Wind or Eee Pc for this .. you could also do work on it too.
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surfer · Member Joined: 12 May 2002

Thanks,

But i do not see a manual crop to 1:77 in autogk. Besize in autogk i don't get any subtitles with my divx file when i want to convert the divx.

Normally the black borders don't bother me but on a 7 inch screen it makes the movy very small!.

When i convert the dvd again to divx, i must use the 640 x 360 resolution? Not higher? Isn't the quality bad with that resolution?

guns1inger · Posted: Jul 02, 2008 18:36

ctrl-F9 brings up the hidden settings screen for AutoGK. Here you can set manual cropping.

Are you converting a DVD to Divx, or a Divx file with embedded subtitles to another Divx file ? Or do you have an external subtitle file ?
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surfer · Member Joined: 12 May 2002

I have seen the ctrl-f9 but not manual cropping?

I am converting a dvd to divx. And if the divx is with blackborders now am converting divx with embedded subtitles to another divx.

guns1inger · Posted: Jul 03, 2008 04:59

You would be better off converting from the original DVD. You will take quite a quality hit going from Divx to Divx, especially if you are going to crop and resize up.

Bring up the hidden settings (Crtl + f9), then tick the box marked Tune Auto Crop Parameters. You can now use the Force Cropping of : to crop off anything you don't want. AutoGK will then resize back up to whatever width you chose in the main settings.
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surfer · Member Joined: 12 May 2002

I have now converted a divx to 640x480 but the black borders stay. Autogk is not woring to good with me so i use any dvd converter.

The resolution for 480 x 360 doesn't exist in videoconverter. What else are 16:9 resolutions? It must be possible to convert the video into full screen on a portable dvd player?

guns1inger · Posted: Jul 03, 2008 06:48

You should use virtualdub and the crop filter. Add a Null Transform filter, then click on the Crop button. You can then crop off the black bars, then cut off as much of the edges as you want to before resizing up to get the final resolution. You can then re-encode it to Xvid or Divx.

The reason no software automates what you want to do is because normally you would not want to do it.
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surfer · Member Joined: 12 May 2002

surfer · Member Joined: 12 May 2002

guns1inger · Posted: Jul 03, 2008 07:15

It depends how much you crop off, and also what resolution the screen is. We have one of those digital photo frames that is 5 x 7, and 320 x 240 video looks surprisingly good on it because the actual resolution of the screen is around 400 x 284. You may have to do some tests to find out what looks best.
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surfer · Member Joined: 12 May 2002

x hink is the good resolution for full screen

surfer · Member Joined: 12 May 2002

I have don it. Cut o0ff the borders top and bottom with virtualdub. Then made a new avi which was much bigger in size. Then convert it again with anydvdconverter to 720x576. The black borders smaller but are still there. This is much work though to do that for every movie.

Isn't there a way to rip a dvd to a particuler size which will play on the portable dvd player with no borders? If i choose a resolution 16:9 this can be played without borders? I rip with Xilisoft dvd ripper platinum.

In Xilisoft dvd ripper platinum there is also a option to "zoom" in the profile. Standard is "letterboxed" i also can choose FULL or pan & scan. I tried FULL but this doesn't make any difference.

guns1inger · Posted: Jul 06, 2008 02:40

DVD comes in two flavours. It is either 4:3 (fullscreen or letterboxed) or 16:9. As you have found, film is often wider than 16:9, so even widescreen DVDs usually have black bars. When you 'rip' a DVD, all you are doing is removing any copy protection that is present, then copying the files. You do not alter the video in any way while doing this. What you want to do is crop and re-encode.

You still haven't told us what resolution your screen actually has, which will tell you want you might want to crop and resize to.

However, there is no point cropping off the borders, then creating a new Divx file at 720 x 576. Depending on the software it will either stretch the video, distorting it horribly, or put the bars back, while at the same time reducing the quality.

What you really want to do is more like this : http://www.thedigitalbits.com/articles/anamorphic/aspectratios/wi ... rama2.html

You have the image on the left (2.35 widescreen AR) and you want to crop it down so it looks more like the image on the right (either 1.33 or 1.778, depending on what resolution your screen is). This you have to do manually, in virtualdub.
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surfer · Member Joined: 12 May 2002

thx. I don't know the resolution yet. It is a Salora twin 7020 with 7 inch screens. The specifications doesn't tell me the resolution..

guns1inger · Posted: Jul 06, 2008 04:39

I can't find anything specific about the resolution, but it is a 16:9 screen, which makes things pretty simple. However, and this is a big however, none of the info I found or specs that I downloaded suggest that it will play divx files. They all say that it plays only DVD, VCD, CD Audio, jpeg stills and mp3 audio. As you are saying you have tested it and it works, I'll go with that.

The basic problem is the math gets complicated. It depends on the source (is it 4:3 letterboxed or 16:9 anamorphic) and your skills. First - I don't do hard-coded. I don't like them, and they are a pain to get right when you have overscan etc to deal with. I also don't get it if you are complaining that 2.35 is too small, how the hell do you hope to read subs ? Anyways, I will leave subs out of it for the moment.

The basic steps you need to follow are

1. Crop off the black bars. So far, so simple

2. You now have to resize the height to adjust for the PAR of PAL video. For 4:3, divide the current vertical resolution by 1.0926 and resize to that amount. For 16:9 source, divide the current vertical resolution by 1.45679 and resize to that. Still with me ?

3. Work out the width you need. Take your current vertical resolution and multiply it by 1.778. Subtract this number from 720, and divide by 2. Crop this number off each end of the video (left and right)

4. What you should have left is a 1:1 PAR, 16:9 (1.778:1) Aspect Ratio video ready for encoding to Divx/Xvid AVI.

For a 2.35 source, you should end up with something close to 544 x 306. The resulting number will vary depending on the source. 2.35 is often approximate, and in reality might be 2.37, 2.40, or even 2.20. The calculations in the steps above will hold for anything wider than 1.778 : 1
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surfer · Member Joined: 12 May 2002

Thx, i will give it a try although it is very complicated though for me...

Salora 7020twin screen supports MPEG4. It is in the books and also on the internet. I have tried it and the movies which are converted with divx6 and xvid are playing fine (exept the borders off course).

surfer · Member Joined: 12 May 2002

By the way: the most dvd's i geet are PAL so the resolution is altways 720 x 568... the vertical resolution might then be 720?

guns1inger · Posted: Jul 06, 2008 05:32

Vertical resolution is 576, horizontal is 720. The 568 is an adjustment for the 4:3 Pixel Aspect Ratio
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jagabo · Member Joined: 09 Dec 2005 Location: none

1) Open your file in VirtualDub.

2) If it's a 4:3 DVD resize to 640x480 or any 4:3 ratio frame size you want (like 512x384, 480x360, etc). If it's a 16:9 DVD resize to 640x360 or any 16:9 ratio frame size you want. The output window in VirtualDub should now show the picture with the correct aspect ratio.

3) Add the Null Transform filter. Use the Crop tool to crop away black borders.

4) Select output codecs and Save as AVI.

guns1inger · Posted: Jul 06, 2008 08:21

@Jagabo :

That is sound advice if you wan to keep the original aspect ratio of the image. The OP wants the image to fill the screen - basically a 1.778 Pan and Scan of anything wider than 1.778. So a 2.35 image, for example, needs to have approx 30% of the image taken off the ends as well as having the borders cropped.
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jagabo · Member Joined: 09 Dec 2005 Location: none

I know. But it's not clear what his player does with video that's not 16:9. The fact that a 720x576 Divx file played back with only top and bottom black borders (as per his original post) implies that it stretches whatever frame size it gets to fill the screen.

If it doesn't stretch modify step 3 to read:

3) Add the Null Transform filter. Use the Crop tool to crop away black borders and part of the picture leaving a 16:9 ratio frame size.

Note that each frame dimension should be an even multiple of 4 for Divx/Xvid to work properly. Multiples of 16 are best. For example, don't leave the frame as 483x272. Use 480x272 intead.