Weird audio/video offset/ "ghost copies" - please advise
Hello everyone,
I'm helping a friend - who has no computer - with a video project, which I have assembled and post-produced for him from DV tapes in iMovie 09.
Things seemed to work out fine first, but we now run into increasingly bizarre audio/video offset issues, and I'm out of ideas.
The source material for this film (50 minutes) is circa 400 current video clips, 20 stills and 10 older (1999) material - to which we added circa 50 crossfades, 30 voice-overs and 20 music tracks here and there (which, I guess, makes this a mid-size project). We also slowed down a few clips to adapt timing.
Here is what happens:
Around 40 min. into the project, I have muted the sound from quite a few clips and added a music track and voiceover.
Now when editing and previewing this project within iMovie, everything looks and sounds just fine: The sound from the original clips is muted, and the (music + voiceover) audio tracks play back as they should.
But once I export this movie (be it as a tiny 3GP clip or an iDVD project), these scenes will have a third, unwanted audio track added: the original sound from the clips following circa +one minute later+ in the movie - at full level, which is embarrassing, to put it mildly.
E.g., at 40:00, the original sound from the clip at 41:10 is audible with its full level - although both the clip at 40:00 and the one at 41:10 are muted within the project.
Now I tried everything I could think of.
I muted all the clips manually.
I separated the audio from the dubious clips and muted it again, just to make sure.
I threw out several of the older clips (coming from a VHS tape) used in this project.
The only effect this has is that these weird offsets/ "ghost" copies move around; they won't disappear.
I am out of ideas. So here I have an iMovie project which runs fine in iMovie itself - but once exported to iTunes or a DVD, it spits out additional audio material where it shouldn't. Very frustrating, and I cannot pinpoint the source.
http://support.apple.com/kb/TA26567 describes a similar problem, but this is a 2005 article referring to versions of iMovie and OS X long gone - and the fix it suggests (exporting 12 bit audio to an external FireWire camcorder in 16 bit and re-importing it) is not possible anymore with today's iMovie.
I would really appreciate if someone could gave me a hint what is happening here, and how to fix this problem.
Thank you.
AppleMan1958 wrote:
Are you using any speed effects? Like Fast motion or slow motion?
If you stick to the pre-sets (25%, 50%, 200%, 400%, etc.) sound is handled well.
If you create a custom speed (say 39% or 159%), then sound will be messed up.
I do in fact use such non-standard values for speed.
I will try to reset them and see what it does for the resulting movie.
(And isn't this the kind of bug we wouldn't expect in an Apple product?)
Anyway, thanks for now. I will report if this helps.
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import javax.media.protocol.*;
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8,
1,
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8,
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