The one big problem that I do have with the toolset is that I get
ghosting in very dark scenes, to the point of making some stuff *very*
uncomfortable to watch -- like seeing it through a heavy, dark fog or
something.
I have experienced the same or very similar effects (mainly on the
chroma channels), but in my case the ghosting is actually in the
original DV. I hadn't noticed if mpeg2enc made it any worse, but
yuvdenoise (motion-adaptive denoiser) does when doing aggressive
chroma filtering. Have you verified that the source DV does not show
any ghosting?
The mpeg2enc command line[1][2] is:
] mpeg2enc -v 0 -f 8 -b <bitrate> -F 3 -n p -a 2 -o <output> \
-a 2 -q 2 -I 1 -r 24 -4 2 -2 1 -N 1.5 -Q 1.5
The bitrate is usually around 5500 to 7000, and the ghosting doesn't
seem to be greatly affected by that, sadly.
Like Steven, I'm surprised you get such low bitrates using -q 2. I
can never get lower than -q 4 for DV stuff.
The effect is that any motion in the scene will leave a notably brighter
patch behind when it moves, for every frame before the next I frame.
Are the ghosts any color, or just red and blue?
Until then, though, these images very slowly fade out while making it
hard to distinguish the actually interesting parts of the image.
In my case the chroma "ghost" actually seems to be 1-2 frames behind
the luma (again, in the DV) so I wrote a utility to delay the luma.
So, is there anything that can be done to improve this? This is the one
major problem I have with my video encoding pipeline at the moment, so I
am pretty motivated to try and fix it.
I've settled on trying to align the chroma blob as best I can and
doing mild or no chroma denoising (and heavy luma denoising). Not
entirely satisfactory, but it looks a lot better at full speed than
frame-by-frame.
Dan
-------------------------------------------------------
This SF.net email is sponsored by: eBay
Get office equipment for less on eBay!
http://adfarm.mediaplex.com/ad/ck/711-11697-6916-5
_______________________________________________
Mjpeg-users mailing list
[EMAIL PROTECTED]
https://lists.sourceforge.net/lists/listinfo/mjpeg-users
