Black border problem, anyone?

[Flying dutchman]

Does anybody else observe the "black border" problem on Matrox Mjpeg files? A thick black border at the left and upper side, as if
the whole picture has shifted in the right and downward direction. The problem becoms highly visible as soon as you try to view the file with a different codec, or when you try to convert it into mpeg etc. The Matrox codec itself seems to "compensate" for this phenomenon during playback.

I'm using video tools 1.51/driver 5.25. Do the other versions have this same problem?

[ccc]

From which source are you capturing video?
A Cam ? TV Tuner?
At which resolution ?

I had a problem with some garbage at the upper side of the pic in the beginnin, because I had choosen Aerial band instead of Cable, when digitizing from TV.
(It think it's Teletext info that was passing by?)

Maybe this can help?

[Flying dutchman]

My source is S-vhs. As I said, it only shows up if you try to play your files with a different codec or when you try to make an Mpeg file out of it. As long as you only use Matrox' own stuff you don't see it...

[Avrigus]

I have this exact same problem, when I capture from both television and VCR sources. Direct playback of the .avi with the matrox codec is flawless but the problem appears when I convert to an mpeg, edit in Premiere, etc. I'm from Australia and our TV standard here is PAL, this may be the problem (a bug in the PAL code maybe??).
I hope Matrox addresses this problem soon as it is most annoying.

[Rafael Martinez]

I also have these problem.
I always capture at 352x576 25FPS (PAL) from my Hi8 camcorder. If I preview the project with MediaStudio I don´t have the problem. But if I try to save to an AVI file (in order to encode it later as mpeg1) I get the black borders.

I may be interested in a solution to the problem.

My setup:
ASUS P5A-B with AMD K6-III/450.
Marvel G200
Fasttrak66 with 2 IBM Deskstar (18GB each)
and a Maxtor DiamondPlus 2500 (10GB)

[fluggo99]

I don't think it's necessarily a "problem" except when you're moving that part of the frame into view, say, when you're doing a transition. (Sometimes it makes a nice automatic border...) In that case, just use a filter to clip off that part.

I've noticed that when the stuff gets encoded back to MJPEG, the frame is once again encoded with a black border, no matter what the source was. It also seems to ignore whatever was originally in that region. (On capture files, there's some green at the top, but in newly-encoded files there's none.)

It's weird, but maybe that's just the normal way the codec works. I suppose that since that part of the frame never shows up on TV (except in the case above), it doesn't really matter.

(Darn...I keep having to edit these because of antecedents! )

[This message has been edited by fluggo99 (edited 11 December 1999).]

[fluggo99]

Or...what if that area is for support of closed captioning or teletext? DirectX articles talk about video ports including the top scan lines in their pictures sometimes because of extra info that might be included up there...DirectX and DirectMedia have support for apps that interpret that info, such as the DirectMedia closed captioning filter.

I wonder if Matrox is holding back a closed captioning utility?