MPEG Streamclip Quicktime: Audio out of sync!

[Jerry Hofmann]

Chances are that you need to match the frame size and frame rate of the original camera files. So what size and frame rate are they?

Jerry

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[David Bogie]

Another quick fix is to change the duration of the audio to match the video. We used to do this all the time with Canon’s non-standard DV codec from the old GLs.

Unlink the audio and video tracks. Write down exactly ow long the video portion is. Slect the audio, adjust the speed to match the video length precisely. Relink the tracks, render. If you want to make sure it’s always in sync from now on, export the media and reimport the newly created media.

bogiesan

[Amie Batalibasi]

Hi there,

Its a canon DC 210. So the footage is 16:9 and 25fps.

When I import it to MPEG Streamclip it displays it in 4:3 so when I “Export to Quicktime” I check the 16:9 box so that it goes back to the correct frame size.

I have found actually, if I export in small sections like 3-5mins, the sound stays in sync. Its only when I try to export the whole lot that its completely out when played in Quicktime AND Final Cut.

hmmmmm….

[David Bogie]

[Amie Batalibasi] “I have found actually, if I export in small sections like 3-5mins, the sound stays in sync. Its only when I try to export the whole lot that its completely out when played in Quicktime AND Final Cut. hmmmmm….”

Canon’s codecs are weird.
Is it in synch or is it just visually undetectable? If it’s actually in sync, there is an absolutely repeatable point at which it will drift; the audio codec’s slightly different sampling rate will drop a frame or two relative to the video codec.

How far out of sync? The sampling rates in the original footage differ by an easily determined ratio. Just take a 00:10:00:00 clip and place the total length in frames of the video track under the total length in frames of the audio track.
Divide.
A few frames or a few seconds?
If the difference is small, say, 10 frames over 10 minutes, the slight change in pitch by modifying the speed of the audio track is not detectable. This step tremendously simplifies your whole operation.

bogiesan

[Gabriel Figueroa]

I just had this problem myself in MPEG Streamclip but I got around it by exporting it to DV as oppose to a Quicktime movie.

[Adam Scoble]

Hi guys, I’ve been having this problem too. Did anyone find a solution within the conversion itself? Instead of different file types or cheating the sync?