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View Full Version : Importance of RC average period & RC up/down reaction?


OvERaCiD23
24th October 2002, 07:46
How important are these settings, and will changing them increase the quality of a movie? I've noticed sometimes that the codec will not encode black solidly right away (e.g. opening credits, after logos appear, the black background will be macro-blocked until the next keyframe). Would altering these settings affect this at all? I'm curious because I'm still having trouble with "True Lies", and even with a 70% compressibility (after C3D, movie is fine except for frames with black ~~> night sky, tuxedos, etc..), black is still not encoded right, like the codec doesn't react fast enough. Aside from the macro-blocking of black, everything else looks good. Will altering these values help me any, or should I look elsewhere?


EDIT: Well, in viewing my movie in both VDub and watching it using ffdshow/BSPlayer, it appears as though the blocking is only a playback issue, but not on my LCD, but rather my TV. i'm playing the movie on a basic 20" TV, could this cause blocking? In viewing the movie fullscreen on the monitor, no blocking is apparent (with or without ffdshow's post-processing), but on my TV blocking is apparent (post=max ~~> more blocking, post=off ~~> less blocking). does this sound possible? if so, what could be done to correct this problem?

JohnMK
24th October 2002, 10:20
Change RC averaging period to half the number of frames, or slightly under. If it's 144855 frames, I usually just do like, half of 140,000, or 70,000. Never go over half. Leave all other settings @ default.

iago
24th October 2002, 22:55
@OvERaCiD23

Well, the black-blocking issue is being discussed in detail for a while in the "lumi-masking" thread in XviD forum. Actually it's a problem related with all codecs. Taking a look at that thread might be of some help to you.

regards,
iago