På Tue, 17 Jan 2012 22:42:01 +0100, skrev Michal Fapso <[email protected]>:

Thanks for your hints, Herman!

I use that down-scaled video only as a proxy. When I set up the
project, I render the final video from 1920x1080p videos. The original
1080p clips were recorded on Canon 600D with Magic Lantern, bitrate
was set to 0.7x to save some disk space:

Stream #0:0(eng): Video: h264 (Constrained Baseline) (avc1 /
0x31637661), yuvj420p, 1920x1088, 30516 kb/s, 23.98 fps, 23.98 tbr,
24k tbn, 48k tbc

How are the results if you process the original video the same way
in Cinelerra and Avidemux?  Do you still get blocky and flickering
video?


When I tried your trick with blurring the U and V channels, it helps
with the block artifacts a bit, but it is still not as good as
avidemux and when I set the blur radius too high, color from small
spots like the yellow from sea-marks vanishes :o(

There is quite a bit of luma blockiness, too.  I doubt the camera original
is as blocky as the proxy, by far.

I really like the output of avidemux for both 640x360 and 1920x1080 videos.

As we already have noticed, Avidemux appears to do more than only
raise the colour saturation.  But what?

--
Herman Robak

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