Hello big brains of the Avid-L2,
I've been handed a situation where the client has a mixed frame rate situation. I've not had to deal with a mixed frame rate output in the past, so I wanted to see if my assumptions are correct, and if there are any suggestions to deal with the 'motion ghosting' issue/problem described below.
Project Info:
- HD 1920 x 1080
- 23.976 fps
- DNxHD175
- The project is already edited
- 50% of the short film's shots are 23.976fps, while the other 50% are at 30fps. The different fame rates are intercut.
- Mac
- MC version 8.something
- Outputting from Avid to a QT with Animation codec (to get around the evil gamma shift). I tried several times with a QT Ref into Adobe Media Encoder, but AME didn't like it, and all I could get out of it was the audio.
Timeline Playback:
Playback of the short film inside of Media Composer looks fine. The 30fps shots show no issue (no motion ghosting), even though they are within a 23.976 project.
Output Issue / Problem (when output to QT):
As one would imagine, the footage shot at the project's frame rate (23.976) plays back just fine after output (since it matches the project's frame rate); but the 30fps footage now has ghosting on shots with motion. Obviously, this is due to the frame rate conversion (to be clear, all those clips have a 'Temporal' adapter on them and include Avid's 30fps notation on the clips in the sequence)
What I tested already (with no luck; all continued to produce 'ghosting' during motion):
1 - Promoted one of 30fps clips to a Timewarp, and changed the render 'flavor.' It was originally Blended Interpolated, so I tried Blended VTR without success. I shied away from testing Fluid Motion because of the render time.
2 - I did a short video mixdown to DNxHD 175 of a few of the 30fps shots in the timeline, and then output that.
3 - I made a new Project that was 30fps, just as a test. As I thought, the 30fps shots played fine, while it was the 23.98 shots that now had the motion ghosting issue.
Questions:
1 - Is there anything I can help them do *now* to reduce or eliminate the ghosting to the 30fps shots from within the original 23.976 project?
2 - Is there anything that could have been done after receiving the footage, and before beginning editing, that would have reduced or avoided this frame rate ghosting issue (e.g. processing the frame rate conversion during transcoding inside Avid, or outside in another app)?
3 - Anyone else found themselves in a similar situation? I just want to make sure I relate the situation well to the client before they go and murder the D.P. or the original editor.
Thanks gang!
Cheers,
Benjamin
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Posted by: Benjamin Hershleder <ben@contactben.com>
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