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audio glitches
here’s one for you…
we are working on a 1hr30m documentary, all of which is in the one sequence- its DV-NTSC, running on FCP6 MacPro Quads with an XSAN XServe RAID 3.5TBholding all the media, a whopping 180hrs of recompressed HDV footage. What we are finding is that certain audio clips are skipping to different points of the track, within the clip itself. The source media is fine, and when one match frames the clip is fine in the viewer. The sequence clip on the other hand looks fine in the viewer looking at its waveform, but when it plays through at a certain point it is like a record needle skipping to a different point in the song. All the audio tracks are AIFFs and it is doing this in both audio imported and clip audio from tape. Re-inserting the clip does seem to fix the issue temporarily but in time the clips begin to skip once more, sometimes in different places.
Possible reasons we have assumed…
Corruption: corruptions between OSX and Final Cut reading the source media,
corruptions with Final Cut within the sequence, or corruptions within lagging or fragmented render files?
Too many edit points: Throughout the sequence we have blended, mainly the audio tracks, through false edits with different levels either side and audio transitions- maybe it is better to use keyframes?Not an easy one as you can see, but quite concerning as audio glitches when you’re having large screenings for large audiences can ruin the film for some and we keep having to check through an hour and a half of edit again and again for annoying glitches.
Has anyone experienced this issue before? Does anyone have any suggestions?
Some solutions we have tried have been-
Reinserting source media (temporary solution which eventually glitches once more)
Copying and re-pasting entire sequence into fresh sequence.
Breaking the sequence into smaller sequences
Deleting all the render files and re-rendering current sequences
-however the glitches continue…
If this seems to be a corruption issue, can anyone suggest some defrag
software or the likes, or are we looking at an entire rebuild of the SAN??
kind regards
hamster -
2 Replies
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Hi Hamster,
Good thorough work!
Ive experienced this issue before on mp3s and 44,1 audio in a 48K project editing Pal SD.
Using clip enable/ctrl + B refreshed my clips to play correctly a while so that might replace your reinserting option.
My solution was to make a droplet in compressor and convert to 48 16bit .aiffbut i don’t now if that helps you out, however i can help you to defrag:
use Terminal:
https://docs.info.apple.com/article.html?path=Xsan/1.1/en/c3xs18.htmlLong shot:
another thing you might try is to select all clips in your sequence, modify – “make sequence clips independent” and copy all the clips into a new sequence in a new project called something else…can
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Hi Hamish
I have the same problem. Drop in a music file and it starts playing at the wrong spot, then in middle it jumos to correct spot,
Have you figured out a solution to this problem?
Wayne
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