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Choppy playbacks\pauses after rendering in AE
I started posting this in AE forum and was told that it is a question for here. Since there is no way for me to move my thread, I will post it here too, or else I would not double post.
Whenever I render anything, even if it’s just an avi or mov file that I added a small effect to, the results are never smooth. It either has a little choppyness, or it has some pauses during playback.
I have tried all kinds of export and compression settings already. (Actually, I’ve tried them all!) I’m using the default NTSC settings.
I don’t think it’s a problem with the computer… I use Windows XP pro, P4, 2.56 CPU, 1GB RAM (%90 free) with plenty of free HD space.
What could be wrong??
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I was answered:
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It sounds as if you’re rendering at too high a data rate. This is probably a Compression Techniques question, but I’ll give it a shot.Use “make movie” and pick a codec in the Output Module.
Did you try Quicktime Photo-JPEG at 89% quality?
Did you try Quicktime Sorenson?
What is the frame size of the movie?************************
I replyed:
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Ok, I never tried to lower the quality… I’m rendering something now with %89 like you said, but if that DOES work better… Why should I have to live with %89 quality? What would I need to do to get best, full quality? Stronger computer?Thank you.
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10 Replies
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Ok, I did Quicktime Photo-JPEG at 89% quality and it came out perfect. But my question still stands, why can’t I benefit from %100 quality?
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As far as I know – under 90% is 4:2:2 and above 90% is 4:4:4.
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How can over %90 be 4:4:4? 4:4:4 means no compression at all, and I AM using a compreser.
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Actually 4:4:4 means no colour sub-sampling – It’s a chroma profile, not really a measurement of compression.
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Isn’t color sampling a kind of compression so that the file size will reduce? If we keep unique luminance and color for all 4 pixes in every image, hence 4:4:4, wouldn’t this mean that the entire video is uncompressed?
Maybe I’m just not understanding but what else is there to compress in the video (not audio) besides the images?
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Yes it is a kind of compression but it’s not the whole story..
For example HDV uses 4:2:0 but is compressed with Long-GOP MPEG-2.
Additionally
There is uncompressed 4:4:4
There is H.264 at 4:4:4
and there is PhotoJPEG at 4:4:4
etc.All the above will have different datarates and visual quality.
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Thanks!
Well, so you know is it’s correct that PhotoJPEG at under %90 is 4:2:2 and over %90 is 4:4:4? Because I render in PhotoJPEG – %89 and a 20 second clip is 61MB.
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So about 9.5Mb/s – At what frame size & what frame rate?
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Standard PAL settings. 720X576, 25.
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Obviously much depends on the frame differences, but the datarate seems about right.
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