Search the Community
Showing results for tags 'out of sync'.
-
Hi Everyone, Noticing an issue with with my Canon 7D internal "in-camera" audio. I would like to use Pluraleyes to do the syncing and have found it works well matching scratch camera audio to external audio recorder tracks. However, the problem lies in the fact that the Canon 7d's "internal" audio from the camera's own mic is not truly in sync with it's own in-camera video. The audio comes in 1-2 frames before the picture. I shot 1920 x 1080 footage at 24p (internal camera settings) with the internal camera audio at it's 48kHz default. I shot a handclap to camera (no external audio at all) and then view the clip it on the FCP timeline : the audio definitely comes in early by at least one frame. My subjects hands are still spread apart yet I hear the handclap well in advance. Other people are seeing 2 frames early. I may get away with or not notice this discrepancy in general dialogue shots, but when I was shooting a singer lip-syncing to a CD track, every frame seems to count. I guess another way to look at it is that the "video" is 1-2 frames "late" rather than the audio being early. I'm using high speed 10-rating compact flash cards and shooting within 5 ft. of the clap. I thought perhaps the sync was getting bunged up during the MPEG Streamclip h.264 to ProRes LT conversion process. I then viewed the raw h.264 camera file directly in QuickTime - I see that the issue exists straight out of the camera and assume that it's a 7D anomaly. Therefore, I'm assuming that all subsequent audio in the clip is out of sync with the picture by the same 1 or 2 frames (not accounting for any possible subsequent drift). Now, if you sync any external audio with Pluraleyes or waveform matching, it too will be out sync (early) by the 1 or 2 frames. Call me crazy, but shouldn't the in-camera audio be in perfect sync with the in-camera picture? Yes, I gather you could ignore the internal camera audio altogether and sync external audio to picture visually, the tried and true way. I guess it bothers me that a $2,000 7D has this sync problem when my $65 Flip video camera can at least have it's audio in sync with it's own picture. I wonder if any other Canon owners might care to check their internal audio to video sync and report back? I'm seeing reports on some sites that other Canon DSLR models exhibit this same issue. I'm curious how much of a known issue this is. Hopefully a Canon firmware tweak might rectify this quirk... hope so. Hope I've explained my issue clearly. Thanks again for your interest and thoughts everyone. Here's a video clip where the issue is demonstrated : All the best, Dave
- 15 replies