Subject:problem with zero crossing setting?

Posted by: Gweilo

Date:9/12/2004 9:02:58 PM

I have SF6 and did many edits of dialog, removing mouth noises and room sounds. i see strange meter peaks over silence in my video editor (inSync Speed Razor 5.5) but dodn't hear anything there. I oopen the file in SF and see no strange peaks, nor do I hera anything odd.
My DVDs made from the files seem to have clicks where these peaks occur.
I checked my preferences and see snap to zero ccrossing is enabled but it is set to "any zero crossing", i.e. neither positive or negative slope specifically selected. There's a note there about needing to pick one to avoid generating clicks. Now..why don't I hear or see the problem in SF yet it gives a visual indicator in my editor and an audible click on the DVD?( I should add, SF meters and plays fine on both the original individual files as well as the full length program made from the Speed Razor timeline.
And if there is a problem here, is there any process that can be batch run to salvage the files? Help!

Subject:RE: problem with zero crossing setting?

Reply by: rraud

Date:9/13/2004 10:22:39 AM

What format are the audio files in Speed Razor and what sampling rate and bit depth?
Is it a propreitory file format? ( Does it go though a conversion process on Import/export?)
Noise Reduction-2.0 has a click removal setting, but to batch process multible files you would need the discontinued Batch Converter or another app like Wave Lab that can batch process AND support DX plug-ins.

Subject:RE: problem with zero crossing setting?

Reply by: Gweilo

Date:9/13/2004 10:40:46 AM

It's 48khz native in Razor. Any reason why I would not have any indication in SF that there's a problem? and why does SF default to "any crossings" if that's a potential problem causer. I would have no idea which (pos/neg slope) to pick anyway.

Subject:RE: problem with zero crossing setting?

Reply by: RiRo

Date:9/14/2004 1:58:23 PM

I've never had clicks from the pos or neg ... I do lots of this. The one thing I do... I always fix DC offset first. If the offset is off... clicks show up.. not sure why.

RiRo

Subject:RE: problem with zero crossing setting?

Reply by: Gweilo

Date:9/15/2004 3:08:02 PM

What do you mean? Support tells me the slope issue has to do with Acid loops and such, not making mutes and fades. Do you avoid the any crossing setting in favor of pos/neg?
So you typically find a DC offset problem? For everything you do? I assume you mean your source files have the DV offset before you begin editing and you adjust that before editing? Please elaborate.
Folowing the help guidelines, looks like my silence lines up with zero so that means no offset issue, right? When I run the DC offset it doesn't seem to change anything and there is "undo" so I assume tehre was notheing to change, right?
Rich
800-327-4269 x25

Subject:RE: problem with zero crossing setting?

Reply by: RiRo

Date:9/15/2004 9:34:20 PM

Offset may not be your problem. I have a recorder that for some reason always has a little offset... and if it is not fixed, clicks are where I can tell. I select any crossing, and have no trouble with cutting... and I have files that have hundreds of such cuts.

RiRo

P.S. my real name is Rich also. There aren't many of us out there!

Subject:RE: problem with zero crossing setting?

Reply by: Gweilo

Date:9/16/2004 8:17:20 PM

Hey Rich,
So you hear the clicks in Sound forge while you're editing?

Subject:RE: problem with zero crossing setting?

Reply by: RiRo

Date:9/17/2004 2:56:28 PM

Yes, the clicks are noticible when the offset is not fixed. The same as when I had turned off the zero crossing option on accident once.

I edit in Sound Forge, then usually save to mp3 and email the file, or burn to CD and mail it. My clients are radio stations, so if they had clicks that do not show up on my equipment, they would be all over me about it. The radio stations use everything... software and hardware wise, so I am reasonably sure what I do is click free.

RiRo

Subject:RE: problem with zero crossing setting?

Reply by: SonyEPM

Date:9/17/2004 6:27:32 PM

(restored post...sorry red!)

Subject: RE: problem with zero crossing setting?
Posted by: Rednroll (Ignore This User)
Date: 9/17/2004 4:06:11 PM

"i see strange meter peaks over silence in my video editor"

What do you mean by strange peaks? What level does the meter read when these peaks occur? Do the peaks also occur on the Sound Forge meters? In Sound Forge, the meters have a peak hold reading, if the peak occurs in Sound Forge, what is the reading it peaked at on the peak meter?

Other possibilities. What is the sampling frequency of the original source file and what is the sampling frequency that it was put on the DVD? It's quite possible that there may be a spike on a 96Khz original file, but is high enough in frequency, where it can't be detected by your ear. Then if you goto a lower sampling frequency onto the DVD, then there's a possibility that an anti-aliasing filter wasn't used in that process, and the high frequency spike becomes aliased and enters into the range where you can hear it.

Subject:RE: problem with zero crossing setting?

Reply by: Rednroll

Date:9/18/2004 8:34:33 AM

"(restored post...sorry red!)"

LOL, No problem, I understand some habits are hard to break. :-)~

Subject:RE: problem with zero crossing setting?

Reply by: Gweilo

Date:9/20/2004 12:40:03 PM

The meters in Speed Razor aren't allthat accurate but teh spikes are near the top and that's over silence. NO meter peaking when played in SF. I'm wondering about DV offset. My silence in all files seems to line up with 0 or infinity in SF. Can there be a DC offset in sections above zero?

Subject:RE: problem with zero crossing setting?

Reply by: Rednroll

Date:9/21/2004 3:45:55 PM

Sorry Rich, I can't seem to help you because there seems to be a lot of misuse of terms in your last post, which I'm not quite understanding. I'm also not familiar with Speed Razor, but if you'ld like to refer to what's going on in Sound Forge and pursue using the statistics tool in Sound Forge on the silent areas you're hearing clicks in, then I could probably help you further.

I also asked some further questions in my original post which you didn't answer to help and narrow down your problem. To really figure out what is going on I need further details of what you are doing. I need to know original file properties, and what tools you are using going from having audio in Sound Forge, to burning that audio onto a DVD.

Subject:RE: problem with zero crossing setting?

Reply by: Gweilo

Date:9/22/2004 10:51:59 AM

Are you using multiple user names?

Files begin and end as 61bit 48khz .wav. I don't hear the clicks in SF while editing.I don't hear clicks in audio exported from Razor, played back in SF. Only see meter issues in Razor on files manually edited(fades etc.) I only hear them in ONE player after using DVDit! to author. I don't hear it in computer players or 2 other settop players here.