Separating Audio channels

downwind · Post by **downwind** » Mon Jul 25, 2005 9:18 pm

Hi all,

I recently recorded a party with a live band. and I had a radio mike on the stage transmitting to the right channel of the camera whilst I was around the crowd at tables picking up their voices. Seemed like a good idea at the time, and in fact is, but I forgot my headphones and the right-hand soundtrack distorts like a #####. All my fault.

So my plan is to disregard the right channel and only use the left audio channel, but in mono of course. Sounds simple enough, but I can't find a way to pan the left channel to centre. The stereo audio channels can't be split in the Audio Mixing panel of this program.

Any sunlight on my dark shadow would be very much appreciated as I have to turn this out within the week.

Cheers

Downwind

rwernyei · Post by **rwernyei** » Mon Jul 25, 2005 10:25 pm

Oh how this will lighten up your dark shadow.

http://jushhome.com/nick/Tutorial/MSPAudioUtil.asp

-Robert

Terry Stetler · Post by **Terry Stetler** » Tue Jul 26, 2005 12:15 am

Or you can also load the video file into Audio Editor, split the stereo into two mono clips. Nedt you select the mono channel you want to keep and save it as a stereo audio file (Options button in the Save As dialog).

Next you load the original clip into Video Editor and split the audio and video. Next select the audio track and use Replace With/Audio File to import the file you created in Audio Editor.

Certainly not as fast as Nicks filters

downwind · Post by **downwind** » Tue Jul 26, 2005 2:23 am

Ask and thee shall be given.

Ho, how quick as well, Thank you guys...I can see the light again.

Tamale · Post by **Tamale** » Thu Jul 28, 2005 8:10 pm

Hello,
i have a similar problem. the audio track of my video file is mono, so i did what Terry stated in his post, and everything was working fine. i was able to convert my mono audio track to stereo (coming out of both left and right speakers). however, after i rendered and created a new video file, i noticed the audio in the new video file is out of sync (drifting) after 15 minutes of playback. i have download the 6.0.0.2 patch and the Windows XP patch.

any suggestions how i can stop the drifting?

thanks
Tam

Terry Stetler · Post by **Terry Stetler** » Thu Jul 28, 2005 9:24 pm

This is because the audio is no longer "locked" to the video. This can be a problem with some DV cams that don't do locked audio or sometimes when using separate audio tracks. You never really know when synch issues will rear their ugly head until you render a given project.

This is an advantage of Nicks filters; the audio remains locked to the video.

The standard fix is to cut the audio and video into segments no more than 2 minutes long. This resets the synch clock at every cut, not letting it drift more than a frame or two out at a time.

Sometimes you can do this on the timeline with the scissors and get away with it, but other times only cutting the original clip into pieces pre-edit will do the trick. Yes, this means also generating several audio clips.

This isn't just an MSPro issue....it happens in most editing bays. I learned this trick from a guy who uses Final Cut Pro.

Tamale · Post by **Tamale** » Thu Jul 28, 2005 9:36 pm

Thanks Terry for the reply.

uggh, i hate to cut at every two minutes. that will take a very long time, for my video file is about 40 minutes. maybe i can cut at every 15 minutes, because although i can tell there is off-sync, it may be forgivable to the watcher.

i'm hoping Nicks filters will solve the problem. i'm going to try it tonight.

i will always record in stereo from now on. silly me to record in mono.

let me know if you have more suggestions.
Tamale

Tamale · Post by **Tamale** » Fri Jul 29, 2005 4:19 pm

Hello,
just want to status my audio problem. i downloaded Nick's filters and viola! Everything is now in STEREO! that's some good stuff from Nick.

it beats cutting the video to smaller segments. i was having such a heartache with this problem, but not anymore. now i can focus on being creative and not technical all the time.

thanks again!
Tamale