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weird audio drift
Hi All!
I have a strange problem with FCP. There is an audio drift in the timeline with a 48kHz sequence and 48kHz clip. After rendering out the material the drift is gone. So, it appears only during editing. It looks like FCP is simulating an other sample rate, but the sequence is in the proper sample rate. Do you have any idea? Please recommend…
THX!
J -
2 Replies
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Audio drift is almost always caused by media captured form a Canon camera.
You did not say anything about your sources, sequence settings, or formats. That information would help.
Separate/unlink the audio form the video and see if the times for the two tracks are exactly the same. Activate timecode overlyas and see if the audio and video t/c are exactly the same if you park the playhead in various places. If they are the same, you are having hardware issues, your audio cannot be processed fast enough to play in real time with the video.
If the times are different, you do not have a 48k audio source but, without any additional information, I cannot begin to tell you where to look for resolution.
bogiesan
This is my standard sigfile so do not take it personally: “For crying out loud, read the freakin’ manual.”
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Hi bogiesan,
Thanks for reply.
The source material is a finished DV PAL 48kHz video, which already went ON AIR in the past with proper settings. Now at the re-editing phase we see (hear) this problem with one of our machines.
The time code is always the same. The drift only appears after a while, no matter where the starting point is.
The sequence setting is the same as the video – Quicktime DV PAL 48kHz.
The hardware is a 4 core Mac Pro, so it should have enough processing power.
The audio is being monitored through the built in sound card.It’s working the opposite way like the problems made by different sample rates (eg. sequence is 48kHz, video is 44.1 kHz) The exported video is OK, but the audio is drifting on the timeline.
THX!
Jozsef
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