Subject:AVI huge after working on audio

Posted by: golfball

Date:7/18/2007 2:47:38 PM

SF9

I have some AVI's that I'm removing wind noise from. (Instructional video shot on a golf course)

The time to re-write the file I didn't care about, but when a file that started out as 6 gigs went to 58, it's obvious that something's wrong with my technique!!

Is there a setting I missed to re-compress the audio before I write the AVI back to disk? Or is something else wrong? Couldn't find anything in the help file ... but if RTFM is the answer ... point me toward the right place please. I tend to stay away from manuals unless absolutely necessary.

I still have the original DV tapes, so if there's a preferrred capture method, please advise

TIA

Kevin

Subject:RE: AVI huge after working on audio

Reply by: Chienworks

Date:7/18/2007 3:06:06 PM

My guess is that it's actually the video that got larger, not the audio. Probably your source files were in some compressed format that Sound Forge could read, but you didn't select the same format when saving.

Question: how long is the file? 6GB of DV is about 28 minutes or so and 58GB is about 4.5 hours. On the other hand, 6GB of uncompressed is about 3 minutes and 58GB is about 29 minutes. So if your video is in the 28 to 29 minute range, maybe the original file was DV and the new version is uncompressed.

One thing you might want to consider instead is to use "Open copy in" instead of "Open in" from Vegas. If you use the copy function then you'll only be working on the audio track in Sound Forge instead of both the audio and the video. When you save it you'll get a .wav file instead of a .avi file. Vegas will then use that new .wav file as a take on the audio track. Your saves will be much much faster, and you won't ever lose the original audio as it's still in the .avi file. Only real downside is that you'll now have two files on the hard drive to manage instead of one, but Vegas handles it on the timeline seamlessly.

Subject:RE: AVI huge after working on audio

Reply by: golfball

Date:7/18/2007 8:47:54 PM

It was about a half-hours worth, so it seems you suspicion is correct on what went down.

I'm guessing Vegas is a different program?? Out of my element working with this stuff, bought forge primarily to digitize my old vinyl collection, and then went onward to this project.

I'm good with just over-writing the original audio with the processed version, all I need to do is kill off most of the outdoor wind noise, and I'm previewing before I process. Worst case I just re-capture off the tape.

Now I just need to poke around further to find how to save it in the original, compressed format, or better yet in DVD format so I can get all 12 of the mini-dv tapes onto maybe 4 DVDs. Is there a better tool for the job?.

And while I'm asking, has anyone done a wind noise killing macro or preset?

Thanks again. I'm a rookie with this stuff ... ther are other DB's where I answer the questions :D

Subject:RE: AVI huge after working on audio

Reply by: Chienworks

Date:7/19/2007 4:07:16 AM

Ah, my mistake, sorry. I had just assumed you were editing in Vegas and only using Sound Forge for the audio work. When you Save the file make sure you choose the correct file type (AVI) and then from the template list choose DV instead of the default uncompressed. Although ... i'm not sure if the DV option will be available if you don't have Vegas installed. Then again, if Sound Forge can read the DV file then it can probably write one as well.

Regarding wind noise removal ... this is vastly more difficult than even removing vocals from music. There really isn't any way to get rid of it when it's mixed in with other sounds. About the best you can do is turn the volume down when there isn't anything but wind. But if you have talking or other sounds you want to hear at the same time as the wind then really your only option is to go reshoot. Wind noise can only be prevented. It can't be removed.

Subject:RE: AVI huge after working on audio

Reply by: rraud

Date:7/19/2007 10:46:33 AM

You can try a hi-pass filter (aka, low cut EQ) this may help some, but as Chien said, you can't remove it once it's recorded.

Subject:RE: AVI huge after working on audio

Reply by: Rich Reilly

Date:8/6/2007 3:54:44 PM

If you save a DV .avi clip back as VFW DV .avi, does the video get recompressed?