Strange ghosting in DV video

[zambelli]

I'm seeing some strange ghosting artifacts in a PAL DV video that I'm not sure what to attribute to. I'm using Cedocida 0.1.6 codec in YV12 MPEG-2 interlaced output mode.

http://www.citizeninsomniac.com/images/DV_ghosting.png

Marked areas exhibit the most obvious ghosting - it's bright and directed to the right.

I was under the impression Cedocida was able to convert PAL DV 4:2:0 to YV12 4:2:0 without any chroma errors, so unless this is a bug in Cedocida, I don't think it's a chroma conversion bug.

What could be causing this? If it's inherent to the video (bad CCD), is there an Avisynth plugin I could use to fix it?

[setarip_old]

Hi!

I don't know if it's related, but you image also appears to be vertically distorted (stretched).

If the (to me) minimal ghosting appears on the original DVD, perhaps it's simply the result of the extremely bright stage lighting versus the extremely dark perimeter...

[zambelli]

I don't know if it's related, but you image also appears to be vertically distorted (stretched).
Well, yes, it's widescreen PAL. It has a 16:11 PAR.

If the (to me) minimal ghosting appears on the original DVD, perhaps it's simply the result of the extremely bright stage lighting versus the extremely dark perimeter... [/Color]
This is the original DV recording, there is no DVD. Is it common that bright stage lighting produces this kind of ghosting effect in CCDs?

[Mug Funky]

looks like haloing.

you can try dehalo_alpha, and set brightstr to 0, darkstr to some number that works.

it might give you some funky effects though.

it's probably some kind of sharpening happening before it's recorded to tape. stage lighting must be hard to record on DV! no chance of playing with lighting ratio etc. consumer camera dynamic range is no match for stage stuff (ever try record a live gig? no way is that going to look good without a hella expensive setup)

[zambelli]

looks like haloing.
you can try dehalo_alpha, and set brightstr to 0, darkstr to some number that works.
Thanks, I'll give that a shot!

stage lighting must be hard to record on DV! no chance of playing with lighting ratio etc. consumer camera dynamic range is no match for stage stuff (ever try record a live gig? no way is that going to look good without a hella expensive setup)
Indeed, it's proving to be a major PITA. One solution is to bring the overall exposure down to stop the white areas from peaking, but then you sacrifice a lot of dark shadow detail, which is not acceptable in dimly lit scenes. In fact, if you look at the sample frame I posted, you'll notice nearly everything except for the white clothing under direct spotlight comes through reasonably well. The bright areas just don't fit into the dynamic range. :mad: 10-bit CCD and codecs would really come in handy here. ;)

[zambelli]

Update: I tried DeHalo_alpha, but it doesn't seem to have any positive effect on this type of haloing. Oh, and I think setting brightstr=0 is actually the opposite of what I'm trying to accomplish. I'm trying to get rid of the bright rightward ghosting, so we'd want to set darkstr=0 (to preserve dark detail) and increase brightstr. But alas, it doesn't seem to work very well on this image anyway.

Is there any way to isolate a certain luma or chroma range and then shift all the pixels in that range to the left?