Just tried AVI raw and there are still clouds of ‘off-colored’ pixels around the object.
I wonder if it’s the mpeg encoding in the AVI output. Is there mpeg encoding in the AVI
files output by blender? (ffmpeg seems to think so)
Is there a way to force mpeg to encode without any compression?
I’m sure the cloud around is done by eavy use of Anti-aliasing. Anyway you don’t need a blue background and chromas key if you render you perso directly from blender. Use alpha channel! in render setting, press RGBA. render as tga, jgeg will compress even if your at 100. and then in the sequencer you’ll be able to do a “alpha over”. Your perso over your real footage aka background.
The Blender sequencer will handle alpha channel tga or png sequence files, as well as full motion video. The output will be as expected, if you alpha over them. There is also a chromakey sequence plugin available in the standard Blender plugins. If it’s not there, do a search and you’ll find many threads on the subject.
Yes Blender do chromaskey with a sequencer plugin though it’s not the best chromas key i saw. And using the sequencer, you can use a suit of images file like images000.jpg, images001.jpg… or any other video format blender support. (you can see the list in the render setting, in the drop down menu). I told you tga or targa, becasue this format support Alpha channel.
So there is no need to break foatage in frame… as you can import the entire video in blender sequencer. just do add >> movie.
also, try premul or key [bottom of the render tab in the render buttons] instead of sky
blender will blend the color of the edge of an object or translucent faces with the sky color if you have sky chosen. This means that when if you look at the alpha channel, the edge of your object will have the wrong color slightly
premul makes the sky not render, and I’m pretty sure it also multiplies the translucent pixels by the alpha value [makes them darker]. Some systems may require this [it is an optimization for an alpha blending equation], but I’ve never used any that did.
Key will cause the world color to not alter translucent pixels, but it will show up on any that are not translucent
I think you should use key, rgba, and a sequence [a file for each frame] of tga images. You will not loose anything because of compression [jpeg is evil] and you ought to be able to do the blending correctly in any decent application that works with video [it ought to be able to import a sequence too…].
besides, using avi raw you’ll reach the 2Gb file limit fairly quickly [also, some filesystems [like fat32] have a 2Gb file size limit on their own]