question about blurred image

[danielmak]

I'm finding a specific type of blurred image that appears when I convert VOB files from a PAL DVD to NTSC and when I crop a file. With the PAL>NTSC the blur appears most notably on bright colors (bright whites--a team jersey and lines on the field--and neon yellows--refs' jersies) and during the crop it appears during action shots and when the lines on the field are shown. Here's the type of image that I'm seeing (look at the number 10 on the uniform for the example):




What can I do to fix this? Is this a bitrate issue? Thanks.

[edDV]

Looks to me like you are resizing an interlace PAL image without deinterlacing first. Or if you did deinterlace, it wasn't adapting for the player motion, so was imperfect.

This should have been showing up before any NTSC conversion.

Can't be fixed after the fact. All you can do is blur untill the lines defocus.

[danielmak]

Looks to me like you are resizing an interlace PAL image without deinterlacing first. Or if you did deinterlace, it wasn't adapting for the player motion, so was imperfect.

This should have been showing up before any NTSC conversion.

Can't be fixed after the fact. All you can do is blur untill the lines defocus.

Actually, in the PAL to NTSC conversion this doesn't show up in the PAL. I have a DVD player that will play PAL DVDs but the image is a little jumpy. It's not horrible but I was hoping to convert to eliminate the jumpiness but this type of image (the still is not from the PAL soccer match) is worse than a jumpy image.

The still is from a DVD that was squished and then cropped to fix the problem. The blurred lines didn't appear until the file was cropped. Something happend when the VOB (extracted with MTR) was cropped and resized with ffmpeg. So, what all of this tells me is that I need to follow Case's advice from the 1:1 thread and then deal with interlacing or deinterlacing.

This has become my standard question on this forum (and thankfully I've been getting by the with the help of folks here): can someone walk me through interlacing/deinterlacing this file (i.e., what I need to do in addition to Case's advice in the 1:1 thread)? Thanks.

[edDV]

I was just analyzing the image. If you look carefully player #10 must be twisting at the hip causing motion in his upper torso and head. You don't see motion in the other players shoes, the ball or the white field line. IOW the camera and other player weren't in motion.

The lines result from either the 1/25 sec motion that occurs between the two PAL fields we are viewing (improper deinterlace), or resulted from the frame rate conversion from 25 to 29.97.

[danielmak]

I was just analyzing the image. If you look carefully player #10 must be twisting at the hip causing motion in his upper torso and head. You don't see motion in the other players shoes, the ball or the white field line. IOW the camera and other player weren't in motion.

The lines result from either the 1/25 sec motion that occurs between the two PAL fields we are viewing (improper deinterlace), or resulted from the frame rate conversion from 25 to 29.97.

This image is from NTSC. It was recorded on a DVD recorder from a US television channel, the DVD was ripped with some kind of PC ripper (don't know the program), and then shared with some other soccer fans. In theory I should have been able to open the ISO, drag the VIDEO and AUDIO_TS to Toast and burn. But the image was squished (see the 1:1 thread for that part of the scenario). Case recommended using the autocrop, which worked in terms of stretching the image to 4:3 and fixing the squish, but this blurred image resulted. I guess I shouldn't have brought up the PAL scenario (I was just trying to explain the only other time I have seen this type of blur and that that blur didn't exist in the PAL DVD only after the ffmpeg conversion).

So the still shown above is from an NTSC DVD. It was NTSC from the beginning but the blur only ocurred after the file was autocropped. The blur didn't exist in the squished images even during action shots. So, what should I do?

Edit: Ignore the last question. I hit deinterlace and it did the trick. Thanks for the help.