Greetings,
Last Wednesday I used my two 5D MkII's in a 3 camera music video shoot. The third camera was a Sony PMW-EX1. Audio was recorded on two additional devices. One audio recording device was an Edirol R4 Pro. The other audio recording setup was a Tascam USB Interface to a MacBook Pro.
The Sony Camera, Edirol, and Tascam/MacBook Pro devices all synced sound perfectly over the full duration of the shoot (just over 20 minutes). To clarify - once the different sources are sync'd quickly and easily to the slate clap on the waveform at the beginning of the shoot they all stayed perfectly in sync for the rest of the video.
Both Canon cameras audio and video sync'd perfectly to each other but drifted significantly from the other 3 devices even over a 3 minute segment. The is a very serious problem for me and one that introduces significant post-production trouble expense.
This issue was so unexpected that I performed 3 subsequent tests to confirm that the 5D MkII's run too fast. The results from the test show both of my 5D Mark II run about 14 frames too fast in 10 minutes. Audio that is 1 full frame out of sync is noticeable on sharp sounds causing an echo. Audio that is 2 or 3 frames out of sync looks odd in terms of lip sync.
That the two Canon cameras audio sync'd OK to each other tells me that the cameras can be calibrated to a standard. Evidently they are just calibrated to an incorrect standard.
Anybody else experience this? Does anybody really know if this is likely a chip issue or a firmware issue? Does anyone know an easy reliable way to get the clips to conform to the standard without time-consuming constant tweaking?
Thanks for your help! Mike