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Audio delay is killng me, please help! (repost)
I have posted this (desperate) query before, but no luck yet – so here I am again bearing my soul and G5 housing!
I have a very irritating problem: if there is an audio gap in my timeline and the playhead then reaches a point where there is a clip with audio, it takes approx 18 frames or so until I hear audio. i.e. the first 18 frames of audio does not play at all, even though it is there.
An interesting feature is that if I click backwards in the timeline to the beginning of the same clip (while still playing) then the audio plays out just fine.
Does this have something to do with locking to the sample rate? I am working in a standard 48khz pal dv timeline (as well as some projects with 48khz 8-bit uncompressed timelines).
As you might imagine, not being able to hear the first bit of audio when editing dialogue or anything where sound is important is a major headache.
Any ideas would be appreciated.
Have just updated to OS 10.4.5 and the Quicktime 7.0.4 in the hopes it would rectify the problem, but no luck.
Have a blackmagic extreme card and monitoring audio via ‘Decklink Audio’ in the system settings dialogue. In FCP (ver 5.0.4) I have audio also set to ‘Decklink Audio’ in the audio/video settings dialogue.
Please help, my boss is starting to give me funny looks!
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3 Replies
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only time that ever happened to me was when i had my decklink card monitoring video, and my audio monitoring set to internal audio… but it seems you’ve got that set corrctly.. have you made sure that your ‘frame offset’ is set correctly for your system? it’s in the playback control tab in the system settings.
good luck.
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I think I know what the issue is. This has been discussed before and the short answer is that your raid or raid card, for some reason is having a problem keeping up with the media bandwidth required for proper playback.
The simple solution: If indeed this is your problem, and I think it is based on the symptoms you describe, is to replace the hard drives in your raid with drives that allow the bandwidth requirements.
If you have a raid composed of SATA drives:
It has been discovered that SATA drives that are over 50% full also tend to respond slower causing the symptoms you describe.If you have a SCSI raid:
You may need to install more drives in your raid and only use 10K RPM drives. Slower SCSI drives (7,200 RPM) may work at times, but I don’t recommend them for this line of work.If your drives are fine and provide the bandwidth needed for your media:
(this happened to me) you may have a slow raid card and will need to replace it so your bandwidth requirements are maintained.Hope this helps,
Paul Thurston -
You might also try to upgrade drivers for your SCSI card. Also new firmware can help too. Firmware on your SCSI card and maybe of your motherboard. Sometimes even bad cabling can result in slower speed!
-Yves
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