Shift between sound and image ?

Hi there!
I have a weird issue on my computer: there is a tiny shift between the sound and the image: the image goes faster than the sound, which is very annoying, especially when the movies are long. Sometimes it works perfectly and it seems to be because the computer is busy doing something else in the background. Otherwise when I'm just running quicktime, the shift appears... But I am not sure this is because of that actually. Any idea ? Thank you a lot !

Any idea?
Afraid I don't fully understand your question. If you are asking why this occurs, the reasons most frequently are:
1) Camcorder audio recorded at 12 bits is converted/captured by harware/software that expects audio to be in a 16-bit format. In this case audio data is processed in groups of 16-bits where only 12 represent a discrete unit of coded sound.
or
2) "Muxed" source file using custom/non-standard bit rates and/or VBR audio is converted to a "frame-to-frame" sync format file. In this case, audio and video is "demuxed" to individual intermediate audio and video streams before final conversion to the target format. Once again, the intermediate audio usually expects a fixed/constant number of bits to represent a discrete unit of coded sound.
Basically, what's happening is that the audio and video streams of information are no longer of the same length when laid out side by side (i.e., "frame-to-frame) and, thus, the audio and video are "out of sync." Specifics may vary. It all depends on the actual source formats, as well as, the manner in which the final streams are merged. Most frequently, the audio track ends up shorter than the video track. If they are merged by starting both tracks at the same time ("added"), then the audio gradually diverges from the video more and more throughout the movie and by the end of a long clip can be noticeable "out of sync." If the tracks are merged by "adding and scaling" one of the tracks, then the problem is somewhat more difficult to define. In this case, the beginning and end of the movie may be nticeable "out of sync" while the middle may almost seem to be "in sync."
Now, if you are asking about solutions, then those depend on the source of the problem. Where the problem is merely in the camcorder setting, change it. If it is in the conversion/capture by hardware/software and user settings are available, then change them. If no such user settings are available, consider changing your work flow. (E.g., capture/convert using different hardware, software, or methodology such as digital-analog-digital double conversion where all else fails). Lastly, you could attemtp to "fix" the problem in "post-production." While is should be a last resort, many good editor applications do allow you to analyze the audio graphically and scale (compress/expand) tracks in order to "re-sync" them. While I have yet to try the utility myself, a dedicated application called "Movie Sync v1.0" is currently available for Mac machines. This utility allows the user to loop audio at a desired point in order to "locally" re-sync audio and video. (I can only assume a localized "scaling" is being performed.)
Does that help?

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Interval between sound and image!

Hello all!
I didn't see that question on the FAQs or in the most recent topics...
On burnt DVDs via iDVD 5.0.1, I surprisingly notice a half-a-second interval between sound and image (the latter earlier), approaching the end of a long movie (45 minutes), should the movie be captured from the camera as a single clip, or should it be split into several clips in iMovie.
As if the sound encoding would result in a longer sound tape as the video tape, the movie perfectly begins and the interval progressively installs...
Any explanation or idea or tip to fix that?

they may have been in a 12-bit format!
12-bit seems to be the industry "standard" for camcorders. Both of mine came set to 12-bit. I learned about switching to 16-bit with my first one, because I read the manual. I wanted the best audio.

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Thanks for your comments, Don and Fred. I hope that this issue will be worked on soon.
Fred, I have set the Preview Quality to High, but it doesn't seem to make any differences concerning the color shift. I have investigated this matter further by now and made the following observations:
*The color shift is a lot less noticable on my laptop (the laptop screen is also color profiled). On my laptop the change is more of a subtle shift in contrast than in color. This might be caused by the smaller color gammut of my laptop display though.
*I have uploaded a testimage so that others can check if this shift occurs at their workstations too - after all, it might be a misconfiguration of my color management software, though I doubt that (because Adobe already states that library and develop render different previews). I would be interested if the color shift I describe is noticable at other workstations too. The link to the testimage: http://www.danyx.com/colorshift.jpg (permission to use the image to test the color reproduction is of course granted hereby).
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OOOOhhhhhh no worries, sorted it.
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I have a peculiar request. ...
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Mike...
Certified Professional Instructor
Certified LabVIEW Architect
LabVIEW Champion
"... after all, He's not a tame lion..."
Be thinking ahead and mark your dance card for NI Week 2015 now: TS 6139 - Object Oriented First Steps

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http://support.apple.com/kb/TS1718
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Image1.png ‏285 KB
Image2.png ‏267 KB

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suggestions to Adobe - Wishlist
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Shift between sound and image ?

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