View Full Version : fast movement ghost
gaucho
26th February 2004, 03:39
Hello all,
I have a tricky problem.
I did an analog capture (PAL) from TV using VirtualDubMod. I used MJPEG compressor with quality 19 to save the file to disk. When I captured it I did a mistake not knowing that this setting would produce a kind of ghosting in faster moving scenes (turn head, walk, etc). Well I enabled the standard noise reduction. Now I'm trying to get rid of this effect.
To make the problem understandable I inserted a snapshot. If you look right hand of the left person, you will see what I mean.
http://www.gauchonet.de/images/snapshot.jpg
I already tried with VirtualDubMod-filters, but no luck. As far as I know, you can do some more tricks with AviSynth (I have version 2.5.4.).
Things I tried out with AviSynth didn't work yet.
Can somebody give me a recommendation?
Many thanks in advance
gaucho
scharfis_brain
26th February 2004, 03:46
I do remember discussing this already on forum.gleitz.info ...
You cannot do anything against those temporalsoften-shadows
gaucho
26th February 2004, 14:47
Nice to see you again scharfis_brain,
and yes, I remember this too, but not everybody here is visiting the gleitz-forrum, and vice-versa. Maybe someone has an idea.
Eg.: I have read that with Avisynth you can load more than 1 clip at once and use one to mask the other or something similar (think it was something like this) in order to correct some errors, and since I already have captured the broadcasting as it was emitted first, I was thinking about using the other one as a sample to this one. The problem with the first capture is, that colors are distorted/overblended in bright scenes because I first had my Scart connected to my VCR, which produces the effect, and I don't know why. Now my capture card is connected to the TV set, and this is OK. Now I have one capture where movement is OK, but colors are not, and another one where colors are OK, and the movement is not.
This is just an idea, but I don't even know if this would work, or even where to start beginning to test.
I'm not expecting an on-the-fly solution nor a simple solution, I know this is a heavy problem, but I just started with AviSynth and I don't know where to start looking for a solution.
To tell you the truth, I have more than only this capture affected by this problem. This started when I started using MJPEG to capture, before I directly used XVID, which produced acceptable captures, and after editing them also avis had acceptable quality. I did this because space was limited on my HD, but now I have a little more. I'm now using Huffyuv, this one is really a good one to get the most quality in the raw capture.
I just tested MJPEG a few times the last 3 weeks, and know I know this one is not the right one, at least for me.
Well, enough for now.
If somebody has an idea I would be happy if he would share it with me.
Thanks in advance.
best regards
gaucho
scharfis_brain
26th February 2004, 14:57
then upload two sample - clips using low-compression
of the same scene.
without knowing them, it is hard to give hints.
gaucho
26th February 2004, 15:41
OK,
but the older one is already sized down to fit on a cd, and I deleted the original raw material for it. The older one has been bradcasted about a year ago, or longer.
I'll post a sample scene, the older one just using direct stream copy (it was compressed with XVID before), and the other one using the raw material I have that is compressed with MJPEG using direct stream copy for the video and compressing Audio to mp3.
I only need to ask afriend if I could use his web space, and I'll post the links.
Is that OK for you?
Regards & thanks.
Gaucho
gaucho
26th February 2004, 20:40
Hello again scharfis_brain,
I just checked the cd with the old capture, looked for the same schene, and what should I say, I found the same effect on this one too. This must have happened when I postprocessed the capture. Would it be useful for you if I just offer you the clip from the actual material?
The idea of using the old material as a sample to the new one just died.
Sorry for the inconvenience.
Best regards
Gaucho
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