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Converting AVI 720×486 to 720×480 DVCPro50
I’m importing 720×486 AVI files into FCP 720×480 DVCPro50 (or 10/8 bit uncompressed)sequence. What I’m finding is that my picture looks fine on an NTSC monitor if FCP takes the 720X486 AVI file and scales it down (approx 98.7%) and shifts the position of the AVI clip (1 or -1 along the y axis) within the sequence. The picture will also look fine if I scale the AVI clip to 100%, but as soon as I set the position to 0 x axis, 0y axis the fields become blurred. I believe this is an upper/lower field conflict.
Is there a way I can center my AVI file (0 x axis, 0y axis) and scale it to 100% without this issue? I’ve tried to crop 3 pixels from the top and bottom of the AVI in Compressor, but it seems to have the same blurred field issue. I need to have this clip centered due to an aligned overlay. This overlay can be scaled…but I cannot shift it up or down (1 or -1 along the y axis) as requested by a client.
Thanks for any info on this in advance.
EGerk -
8 Replies
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Centering the 486 on a 480 timeline will result in a field order flip. What happens if you do this but apply a Field Shift filter to the clip? Does that look OK?
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Try cropping 2 lines from the top & 4 from the bottom. Or is it 4 from the top & 2 from the Bottom?
Arnie
Now in post: Peristroika, a film by Slava Tsukerman
https://www.arniepix.com/blog -
I would have suggested that, but it will move the picture up a line, won’t it? How about changing your timeline to uncompressed 8-bit, which is 720×486?
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I’ve tried shifting the fields, but then some text elements appear blurry, while over all the rest of the image looks ok.
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Yes, The file has to stay centered (can’t do 4/2 crop), and client needs the sequence as 720×480 for processing reasons…so I can’t use 486.
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When you crop an odd number of lines from the top, you’re, in effect, lowering the video 1 line & reversing the fields. Your only other alternative is to resize from 486 to 480 without cropping.
Arnie
Now in post: Peristroika, a film by Slava Tsukerman
https://www.arniepix.com/blog -
Well, I think I’ve managed to get it to work. I took the source file (avi) dropped it into Compressor and trimmed 3 fields from the top and 3 from the bottom. Then the important step is to invert the fields within Compressor (upper first) and export as DVCPro50.
This seems to work fine and playback well in FCP. Thanks Tom and Arnie for your help and info.
-E Gerk
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Great workaround. This could come in handy for a lot of people.
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