faint line 4 pixels from top and bottom of encoded frame

[johnells]

I noticed in my TMPGENC encoded 2.35 SVCD that at about 4 lines from the top and bottom of the encoded frames there are faint horizointal lines. Could this be caused by the interpolation/encoding process? Is it fixable. I know that as you get to the edge of a raster image the resampling becomes biased away from the edge.

PS: I don't have a Trinitron monitor! It is not the monitor!

[mats.hogberg]

... and those lines are absolutely not part of the source video?

/Mats

[johnells]

I will have to double check on my PC the source where there is no overscan. I am pretty sure I would have noticed it. I will report back here later.

John

[flaninacupboard]

is it possible for you to load up the mpeg with the errant lines grab a frame and post it here so we can see the problem?

[johnells]

OK here is the grab I promised! Take a look at the border of the frame. There is a definite line running the perimeter.

Since it is in the original I am not worried. Now I am just curious. Anyone have an idea?



John

[johnells]

Since I did not get any replies I am going to explain it differently. The original DVD contains a strip about 4 pixles from the top and bottom of the frame. Since the movies is widescreen you can easily see the line next to the black bars.

In fact if you look closer you can see lines running vertically as well. These should be lost in over scan on a TV.

I guess it must have something to do with the edge of the film during scanning.

Any comments?

John

[flaninacupboard]

if it was the edge pixel i'd say it was to make the edge look sharper on an interlaced TV, but 4 in is just plain odd. i'll keep an eye out for these lines in future......

[Gazorgan]

My 2 Cents worth. What I think you are seeing is the true boundry of the original image. Since this is widescreen, on a widescreen tv it would be in the overscan range of the TV. Since it's letterboxed, it drops into the visible area. It almost looks like crop marks from the encoding process of the original DVD?

That's AP1 or AP2? I believe both of those are Film Masters (as opposed to digital masters). I think it's an artifact from the original digitizing process. You can easily add a black mask of 4 pixels around the image during encoding and remove it.