AutoGK sometimes converts 4:3 DVDs to 16:9 randomly

[Salva Veritate]

I convert many DVD videos to AVI using AutoGK, and most of them convert normally (as in 4:3 DVDs > 4:3 AVI and 16:9 DVDs > 16:9 AVI) but every once in a while, I get some random DVDs that convert from 4:3 DVD to 16:9 AVI, cutting out some of the video. How do I fix this? This only happened 3 times out of 50 or so DVDs I converted.

[manono]

It sometimes crops too much of the top and bottom of the video, converting it from fullscreen to widescreen? If so, try adjusting the AutoCrop parameters. It's all explained in the included tutorial:

Sometimes auto crop used with default parameters by AutoGK cannot totally remove black bars or removes too much of a movie material. In this case "Tune auto crop parameters" is very handy. Threshold defines how sensitive auto crop will be: the higher the value the more cropping will be done. To completely disable audio crop you can set threshold to 0. "Number of frames to examine" is useful parameter to change if movie is a mixture of full screen/wide screen shots, so by selecting different frames that auto crop examines you can improve cropping process. "Starting frame" can help auto crop in situation when you have a full screen logo as a part of widescreen movie, in which case autocrop might decide that the whole source is full screen. By selecting a different starting frames you force auto crop not to examine irrelevant starting movie sequence. "Force cropping" option allows you to crop additional pixels after autocrop operation (if you find that you need to always crop several more pixels you can use this option). If you disable autocrop with threshold 0 then "force cropping" option becomes fully manual crop. Remember always to check how movie looks like after you set new auto crop parameters using Preview function of AutoGK.

http://www.autogk.me.uk/modules.php?name=TutorialEN#6

If tuning the parameters to either examine more frames or to make it less sensitive doesn't work, then disable it altogether and put in your own crop values.

[Salva Veritate]

Well I'm saying that I want to convert from 4:3 fullscreen to 4:3 fullscreen, but for no reason it converts to 16:9 widescreen even though I didn't want it to.

[manono]

Then you misunderstood what I wrote, because that's what I thought you wanted. Try some of the suggestions in the tutorial I quoted. Sometimes the problem comes if there are parts that are in a different aspect ratio, like a widescreen logo at the beginning of a fullscreen movie. That can mess up the autocrop. In such cases you can use the Hidden Options to have the autocrop begin its search later in the movie, after the logo. Or you can lower the threshold, so it'll crop less. Or you can increase the number of frames to examine, in the hopes the cropping becomes more accurate. Or you can disable the autocrop entirely and put in your own crop values.

[Salva Veritate]

.nhjjjjj

[manono]

Hi-

No, I don't know what you're doing wrong. I'm not sure you're doing anything wrong at this point. If you have a small sample of the source you can upload somewhere, I can get it and run some tests. One way to get it is to load a VOB into DGIndex, use the [ and ] buttons to isolate a small section (10 seconds or so will be enough), and then Save Project and Demux Video. The M2V it creates will be plenty.

[OldAmateur]

[quote="Salva Veritate"]Here are my specs. I just tried it out after adjusting the autocrop a little bit, and it still produced a widescreen result. Can you please tell me what I'm doing wrong?

You have the Threshold on Autocrop set to 34. Try setting it to 0, to turn off the Autocrop function completely.

[OldAmateur]

Here are my specs. I just tried it out after adjusting the autocrop a little bit, and it still produced a widescreen result. Can you please tell me what I'm doing wrong?

. . . and you might try unchecking the box on "Override input AR".

I don't know what the "override" algorithm is, but it might be possible that you have input that isn't strictly 4:3, and the algorithm may be changing the output to what it thinks is the nearest "standard" aspect ratio. One possible clue: is the 16:9 output the full 4:3 image stretched horizontally, or is it cropped on the top and bottom?

[Salva Veritate]

Thanks OldAm! =D That method worked. I don't know why I didn't try that lol.