Choppy and silent audio when 3D rendering

keke27 wrote on 5/11/2016, 8:21 AM
Hello Everybody,

My first post here, kinda new to here. I susbmitted a ticket to Sony Support weeks ago, but never received an answer. Is this usual?

I have a HDR-TD30E 3D camera. I try to edit its video in Sony Vegas 13 Pro.

Video: MVC 1920x1080-24p, 25 Mbps video stream GPU.

Audio: MP3 Audio 320 Kbps, CD Transparent Audio, OR Dolby Digital AC-3 Studio 5.1 Surround DVD. (AC-3 preferred.)

My test project consits of approx. 142 test MTS files, copied directly from the SD card of the 3D camera, about 50-60 minutes long total. No effects, just these 142 clips put on the same track, one after another.

Our target would be 3D BluRay disc, so we render audio separately.

When I render the project, the picture is perfect.

When I render the audio separately (this is the way to do it AFAIK), after about 80 cuts (in this case about 18-20 minutes) the audio gets choppy for a few minutes, then goes silent completely. Tried several audio formats, the exact point of time of going choppy and then mute slightly changes, but the result is always about the same.

Is there a way to avoid this? Is there a limit in Vegas that causes the audio going mute after a while?

Strangely, when rendering the very same project in 2D (video and audio at once), the audio is perfect from the beginning to the end.

Another detail. If we make, for instance, 3 videos, 20 minute each, putting them together, resulting in a 60 minute 3D video, the whole audio renders perfectly and the 3D BluRay can be made. But from many short ones, like family celebration clips - no way.

Any clues would be appreciated.
Thank you in advance!

Best regards,


rraud wrote on 5/11/2016, 9:42 AM
Re-post this on the Vegas Pro -video- forum.
Not sure why this would happen but try a work around by removing the video prior to rendering the sound or set it to 2D.
keke27 wrote on 5/11/2016, 3:07 PM
Good advice about removing the video, will try it.

Thank you, I repost on Vegas Pro video.
keke27 wrote on 6/9/2016, 10:41 AM
Okay, so removing the video or changing it to 2D did not help. Found only one solution, not exactly a "solution", rather trade-off.

The original sound was 5.1. I deleted all the tracks, except the topmost one, the one with the front left and right audio channels. And I changed the project audio to Stereo. This way it renders audio perfectly to the last second.

Any ideas why it doesn't render stereo audio all the way to the end when all 5.1 channels are in?