Frequent missing audio

JeffBradt wrote on 12/28/2008, 7:43 PM

I have a problem that seems to be occuring more frequently. I capture a tape and when I put it on the timeline it has portions that have completely dead audio (no waveform). I can recapture the tape and it's fine. I even took the the same video over to a friends machine with Vegas and the audio was there for him. I have reloaded Vegas and it didn't help. I've noticed it on clips captured to both internal and external drives. Does anyone have an idea what's going on?

Comments

Chienworks wrote on 12/28/2008, 8:19 PM

I had that problem some with tapes recorded in LP mode. The problem would get progressively worse as the camera and/or the tapes aged. Often those same spots would capture fine the second time around. Never had the problem when using SP mode.

PeterWright wrote on 12/28/2008, 8:25 PM

I remember a few instances with HDV a few Vegas versions back, where the line was flat but you could still hear the audio

What source / format is your video?

JeffBradt wrote on 12/28/2008, 8:40 PM

Video is HDV from a Canon A1. I'm editing the m2t files on the timeline.

johnmeyer wrote on 12/29/2008, 8:51 AM

I had the same thing happen this past weekend, while editing a big project. Can't remember if it was m2t or Cineform intermediates.

I am pretty sure it has nothing to do with the capture itself, because I ended up getting everything to work without recapturing. I can't remember exactly what I did because I was fighting a huge number of Vegas bugs (black frames, dropped frames during the live to disk capture which required me to re-capture those small portions from tape and then overlay, and many more).

However, I did get everything working, and I think you can too.

First thing is to save the project, quit Vegas and re-boot. I think that may be all it will take. Remember that many of Vegas's problems are caused by very poor memory management (at least that is my impression).

Second, select an event that contains flatlined audio and render it to WAV using the WAV template which matches the audio (probably 48,000 Hz stereo). Import that as a take. I think this is what I did in order to get things working.

johnmeyer wrote on 12/29/2008, 9:24 AM

I just started a new project and couldn't get audio. My previous project was 5.1, and this is stereo. To make a 20-minute story short, it appears to be a bug in Vegas where something in the audio chain gets hosed. My track header volume control kept getting set to -Inf, but even when I set it to 0, I got no audio.

I then right-clicked on the audio track header and reset the defaults to factory standard. I quit, then re-opened Vegas, and things are working again.

JeffBradt wrote on 12/29/2008, 3:05 PM

Hey thanks. I'm out of town now but when I get back I'll try it. Glad to hear I'm not the only one!

JeffBradt wrote on 1/1/2009, 7:09 PM

I still can't get my dead audio sections back by rebooting or rendering as a wav and then adding a a take. Anybody else having this problem? I know I can recapture the tape and I'll be okay but I'm having to do that too often.

Pcamp wrote on 4/8/2009, 10:38 AM

I am having this problem on m2t files from a Canon HV20 - has there been any resolution to your question?
Thanks
Paul

Zelkien69 wrote on 4/8/2009, 10:55 AM

I've had like issues with XH-A1. Ultimately I capture with HDV split and it hasn't happened since.

I think it must be Vegas because as stated by others, I've had flat line audio have perfect sound. Vegas, Vegas, Vegas.

Pcamp wrote on 4/8/2009, 11:46 AM

Thanks!
I will give that a try.
Paul