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Xpress Pro HD adding frames to imported Quicktime clip
I’m having a bizarre problem with Avid Xpress Pro HD adding random duplicate frames to some comps that I recently delivered to an ad agency. The original footage for the project was shot on a Panasonic AG-HVX-200 at 1280×720 23.976 (DVCProHD). I ingested the footage from a Panasonic P2 drive into Final Cut Pro with no problems. I imported the resulting Quicktime files into Combustion as elements for the composites I was hired to create. All of the footage was correctly interpreted by Combustion as being 1280×720 23.97, and I rendered the comps out at the same size and frame rate. I saved the final comps as Quicktime .mov files, 1280×720 23.976 uncompressed 8-bit 4:2:2. The files play back correctly in Final Cut Pro and QuickTime player. The Info panel in QuickTime player reports a frame rate of 23.98.
The ad agency imported the clips of my comps into a 1280×720 23.976 timeline in Avid Xpress Pro HD (Windows XP). Then a very strange thing happened – Xpress added some duplicate frames to the imported clips, slowing them down slightly (and lengthening them in the process). The duplicate frames don’t seem to occur at regular intervals. Sometimes they’re 4 frames apart, sometimes 6 or more. I initially suspected that Xpress was incorrectly trying to add/remove some type of pulldown, but the randomness of the duplicate frames doesn’t seem to correlate to any standard pulldown cadence.
On playback in the editing timeline, the shot (a slow, smooth, sideways dolly move) shows stuttering motion not present in the Quicktime clips prior to being imported into Xpress. The agency ingested the same original P2 footage into their system as MXF files. The other shots in the project that were imported directly to their Avid do not exhibit the behavior that the imported QuickTime files do. I am at a loss as to what is happening here… Has anyone experienced this issue before? Any suggestions?
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