Audio Sync problems

[Felix Dames]

Question:

Do you have QuickTime files as footage material in your edit?
If you have QuickTime Files as footage there is the problem because Premiere seems not to be compatible with QT files. It is compatible withe the video track but not the audio track and that’s the importend point:
The audio is always getting conformted by Premiere up to 32bit floating point and I recognised that audio after the conform process has a cutting/doubling or crackling sound every 4 minutes but only with QT files (doesn’t matter wich codec) with avi files everything fine and ok.
I don’t know why it is like that but I have had the same problem that’s why i’m useing only .avi’s

PC -> AVI
Mac – QT

Shouldn’t be like this but it seems this is the reality 😉

Felix

[Matt Dowling]

Hi Sameer,

I would advise not to use a seperate disk for audio – keep all your media on your RAID. I would also run the 5.2 drivers which are on the support page now.

Also do you have the dropped frames warning on? Are you actually dropping frames?

Please try the above and let us know how you go. If it still fails please let us know your system setup and we can assist you further.

Cheers,

Regards,

Matt
Blackmagic Design

[Sameer Shrivastava]

Hi,
Thanks for the advice, I’ll try the suggested settings. No my video never drops and the dropped frame warning is on. What i do is batch capture approx a 1000 cut edl. Import a wav file “stereo” file and place it on time line. I do some graphics on afx and render them as avi with blackmagic 10 bit codec. whenever such problem comes i just punch back audio only which corrects the problem. but i waste expensive dg beta hrs doing that.

the chances of dropped audio reduces if i finish the work, save & restart the system and do master to tape.

Any way i’will report after doing the suggested settings

sameer shrivastava

[Sameer Shrivastava]

Hi,
I did the suggested two settings for my current project. the same thing happens. just rolled back to 4.8 drivers. will report if audio still drops
thanks
sameer shrivastava

[Sameer Shrivastava]

HI,
Today i took out four masters without any sync problems with 4.8 drivers. but on assemble edit the first frame is either wrong or repeated and the whole master get’s delayed by 1 frame (audio & video Both). this problem is not there in ver 5.1 & 5.2 drivers.

Next project i’ll try ver 5.0 drivers.

thanks
sameer shrivastva

[Myron Lenenski]

Our editor just did a 90 minute feature film to digital betacam and the audio was 15 frames early. Possibly 150 cuts.

No dropped frames. New 5.2.0.1 drivers. Decklink HD 4:4:4. 1.8 TB SATA RAID.

We have to make a second pass now to get the audio in sync.

What’s up with that?

[Sameer Shrivastava]

Hi,

Please repost this problem,
i just happened to check back for somebody else. decklink guys need to take this problems seriouly.
My safe bet is to use 4.8 drivers( but beware of 1 frame late problem as discussed previously on assemble edit).
with other latest drivers just reboot the system after you finish doing every thing all the renders etc. and just export to tape as you open your project after rebooting. This solves on a temprerory basis.

I thought it might be my raid problem. but there was no video drop frames. But you have a much better raid. I was working on sd project. any way next week i am doubling my raid, then i will check if the problem persists. Now i am scared my upgrading might not solve the problem.

thanks
sameer shrivastava