Random digital noise on audio playback after edit

[Kubi]

I'm getting the most unusual digital noise on audio playback after editing soundbites. The digital noise sounds like "digital interference", it's the audio that's supposed to play, but with random distortions and squeaks.

Quite repeatable: i.e. I'll copy a time selection, paste it to a new location, then maybe edge edit the new soundbite, or else slip edit. All of a sudden the new soundbite will have random digital noise in the playback. The original soundbite in the original location will playback fine.

Then, if I merge the soundbite into a new file, all is well again. I can then recreate the problem with about 50% likelihood if I edit the new soundbite again (the one I just created via merge, that is now problem-free). If I then undo the edit, the problem remains. If I then merge again, it goes away.

This is a new problem, but since I just upgraded to a MacPro, everything is changed.

8-core MacPro 28GHz, 10G RAM, 10.5.3

MOTU PCIe 424, 2408 mk3,

All current drivers

DP 5.13

No plug-ins instantiated, tiny project (three stereo pairs; I'm playing around with the temp track to map out what I'll do, so there's literally nothing but the films stereo production audio and the temp track I'm editing around in...

DP is set to 48kHz, as is of course CoreAudio. DP is playing back a movie file.

Any bright ideas???

[Kubi]

Actually, on more testing it appears to have everything to do with copying from a time selection. DP creates a new soundbite with the exact same name, and that seems to be an issue (never had this problem on PPC/Tiger, but I had noticed before the fact that there are two soundbites with the same name after using time selection to copy and paste... always thought that was peculiar.)

If I copy the soundbite either as a soundbite, or by scissor tools (and thus end up with a newly named soundbite) the problem disappears. Or else if I merge and thus create a new soundfile altogether...

[Kubi]

And after one more test, I definitely think it's a naming issue:

If I use time selection to copy a part of a soundbite, paste it into a new track in another spot, and hit play - digital noise.

If I use time selection to copy a part of a soundbite, paste it into a new track in another spot, and then immediately option-edge edit the soundbite to give it a new name, all is well.

No idea why this wasn't a problem on a G5 in Tiger, but is on an Intel in Leo (at least on mine...) Here's to hoping that copying and pasting via time selection results in a newly named soundbite in DP6...

[dogBoy]

I've had this distortion also, been trying to track it down.
The most recent was when I imported some audio from a website for work.
The distortion would come and go. I merged the sound bites, the distortion was no longer.

Other times it seemed to be due to a Quicktime being compressed with an unusual codec, I re-compress, things start working the way they should.

Both examples seem to do with a conversion DP needs to make to work happily.

[Kubi]

Interesting!! This, too was imported audio, not generated by DP. But in my case the original import plays back fine, it's the copy-and-paste file that doesn't.

[lewism]

i think i got the same noise too.
it happens when you have bits of the same audio file on different tracks.

i got the noise happening again so i just tried running the same project off my USB IDE external drive and it seems to not be making the noise anymore!

maybe it's a problem with SATA drives as they are the internal ones in the mac pro?

see if it works for you..

[pietervd]

hi
i found this thread with the search funtion.
i have a new mac pro octo and DP 5.13 + motu ultralite.
there was a lot of digital crackling when i had a loop copied a few times (on the same track).
and just like mentioned above, when i did 'merge soundbites' it was over...

is there a proper solution for this?
p

[Kubi]

The proper solution is to install DP6, but of course that has its own issues. At issue is a naming problem that apparently DP6 fixes.

In DP5, I found it helps immensely to avoid using the ordinary copy-and-paste commands in audio tracks and option drag etc. in the Sequence editor instead. Thankfully that's how I normally work anyway. Another quick solution is, after doing a regular copy-and-paste (cmd-C and cmd-V), to option-drag the edges of pasted soundbites a little (easy and quick to do as they are still selected after the paste), on either side, doesn't matter. That renames the pasted soundbites and solves the problem.

[scooter]

I'm having the same digital noise. It's intermittent. I didn't really know why. Thanks for tracking this down Kubi. Looks like there's a workaround for it now.

scooter

[quezbor]

I've had this problem, on several systems since June 2007 with 0 help from tech support!!

http://www.motunation.com/forum/viewtop ... =1&t=20954

Merge soundbites seems to have worked! Thanks! Finally, I hope!!! I've had long moments where this problem doesn't happen and my system is rock solid, then, all of a sudden, it comes back. On 3 completely different systems. 100% DP problem, I'm absolutely certain of this. I'm also certain it has to do with imported files, because it's usually with sfx and production music delivered from clients. I have to admit, not going to DP 6 because of this, and probably switching to Logic next major upgrade, if I need an upgrade. Drag.

[cbergm7210]

Is this what you are referring to...

http://www.motunation.com/forum/viewtop ... sc&start=0

http://www.motunation.com/forum/viewtop ... =1&t=20954



Here's a link of a movie that I made of the noise I experience. I get around this on a daily regular basis by Merge.

http://www.rfjmusic.com/dpnoise.htm

[Kubi]

I've had this problem, on several systems since June 2007 with 0 help from tech support!!

http://www.motunation.com/forum/viewtop ... =1&t=20954

Merge soundbites seems to have worked! Thanks! Finally, I hope!!! I've had long moments where this problem doesn't happen and my system is rock solid, then, all of a sudden, it comes back. On 3 completely different systems. 100% DP problem, I'm absolutely certain of this. I'm also certain it has to do with imported files, because it's usually with sfx and production music delivered from clients. I have to admit, not going to DP 6 because of this, and probably switching to Logic next major upgrade, if I need an upgrade. Drag.

Supposedly DP6 has fixed this particular issue. In older DP versions, any action that results in a renamed soundbite (so i.e. edge-drag etc, not just merge) seems to fix the problem if and when it happens.