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View Full Version : gh1 weird artifacts in motion blur



DrBlaz
05-19-2009, 11:34 PM
I'm not familiar with AVCHD codecs, but comparing it with another AVCHD cameras, it seems the gh1 has some kind of problem dealing with motion blur, producing very weird artifacts instead of natural blur.

I'm testing it now, and it seems, as pointed before in this forum, that this is not a bitrate problem, cause the weird artifacts seem to appear only when strong motion blur is present. In another videos from canon hf10, 1440x1080p25 , the bitrates are similar to gh1, or even less, and when panning there are blur, not artifatcs

sample frames resized 10 1280 and saved as jpeg:
-hf10 fast paning, average bitrate 14mbps
-gh1 fast paning, average bitrate 14mbps

http://www.megaupload.com/?d=5KKLFJJV

Also, I've done no proper testing (I havent my gh1 yet!), but when paning at 1/50, the motion blur seems to be a lot less that with other video cams at 1/48 ,

may be a GH1 owner could do a fast paning at 1/250 or 1/500 to see if the artifacts do appear more or less.

Isaac_Brody
05-19-2009, 11:41 PM
Can you link to where you got the original footage? Much easier to look at the source than jpegs to see what's going on.

DrBlaz
05-20-2009, 12:14 PM
Isaac , these are the links for the m2ts videos:


HG10:

http://file.meyersproduction.com/hg10/00011.MTS.zip

GH1:

the last video focus13.zip from here

http://lemon.soju.co.uk/g1/gh1-video-tests/



The jpg sequence shows exactly what happen, the quality is the same as original videos, except pulldown removed and resized to 1280x720