Cinema tools will restamp a frame rate it it's an I frame codec. Also QT change has some of that functionality but I believe there are caveats to QT changes frame rate restamping that isn't recognized by all software. I haven't used the function in QT Change so I may be in error about it capabilities and limitations. If there was only an expert on it on this list then my Holidays would be complete. Oh wait..... ;-)
---In avid-l2@yahoogroups.com, <dvcinlv@...> wrote :
> Otherwise, I bet Media Encoder or Compressor (using Frame Controls - Fast retime) would handle this accurately.
Mark, I laid out your solution:
Rate Control: FAST (nearest frame) <<< I assume this "Fast Retime"
Set Duration * so source frames play at 24.00 fps
Each second 24 frames need to be placed in the new file. The "nearest" 18fps frame -- closest in time to when a 24fps frame would be output -- will chosen to be output. This works as one frame in every three is repeated: 1:2:1
Frame: 1 2 3 4 1 2 3 4 1
24fps: 0.000 0.042 0.084 0.126 0.168 0.210 0.252 0.294 0.336
0.0 0.014 0.028 0.028 0.014 0.0 0.014 0.028 0.028 0.014 0.0
18fps: 0.000 0.056 >>> 0.056 0.112 0.168 0.224 >>> 0.224 0.280 0.336
Then I realized I made an error when I said the first file was 18fps. My frame-by-frame film transfer unit's software outputs a file with every film frame recorded as one PsF video frame. Unfortunately, the software tags this file as 29.97fps because, I assume, a QT file needs some frame rate tag and 29.97 is the only valid NTSC frame-rate. So the times aren't every 0.056 as I showed, but 0.033. (I think this is why MC won't work either.)
Your solution would work were there a way to change the source file's frame rate to 18fps without changing any frames in the file. I have utilities that read-out frame rate, but at this minute I can't think of one that modifies a frame rate. Anyone?
I could convert the source file to a folder of numbered images. This eliminates all frame rate information. I could write an AppleScript that copies each image to another folder with every third image copied twice. Now Compressor would output a 24fps file from the second folder of images.
Far simpler would be if an existing utility could be given a string = CCR and it would use this pulldown to make a file and tag it 24fps.
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Posted by: bigfish@pacbell.net
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this is the Avid-L2
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