Choppy and silent audio when 3D rendering

keke27 wrote on 5/11/2016, 3:05 PM
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, 5:33 PM
"I susbmitted a ticket to Sony Support weeks ago, but never received an answer. Is this usual?"
Unfortunately... yes.. all too common. This forum is likely a better/faster tech resource with some very knowledgeable folks on-board. My expertise is more on the audio side, but I'm at a loss to offer any fixes for your particular issue. Sorry.
3d87c4 wrote on 5/11/2016, 5:51 PM
No idea about the fundamental problem, but...

Can you render the audio from your 2D version and use it in your BluRay?

Del XPS 17 laptop

Processor    13th Gen Intel(R) Core(TM) i9-13900H   2.60 GHz
Installed RAM    32.0 GB (31.7 GB usable)
System type    64-bit operating system, x64-based processor
Pen and touch    Touch support with 10 touch points

Edition    Windows 11 Pro
Version    22H2
Installed on    ‎6/‎8/‎2023
OS build    22621.1848
Experience    Windows Feature Experience Pack 1000.22642.1000.0

NVIDIA GeForce RTX 4070 Laptop GPU
Driver Version:
8GB memory

keke27 wrote on 5/12/2016, 7:54 AM
Would that mean that I need to separate the audio stream from an (for example) mp4 file? I've never done that. Is there a tool for that that does this without re-encoding the audio? (Preferably 5.1)

It sounds like possible, but I am shocked that a "professional" software needs shuch kind of "hacking" and extra render time (!) to get what I want.
rraud wrote on 5/12/2016, 9:38 AM
"Is there a tool for that that does this without re-encoding the audio?"
- Yes.. there's a few to choose from. I usually use 'MeGUI' if I need to replace/remove a new or alternate audio mix. It does not re-render or re-encode either the audio or video.
MeGUI is the most comprehensive GUI based ISO MPEG-4 solution. It supports MPEG-4 ASP (xvid), MPEG-4 AVC (x264), AAC, MP2, MP3, Flac, Vorbis, AC-3 audio and various common containers support (MP4, MKV, AVI, M2TS)"
keke27 wrote on 6/9/2016, 10:40 AM
Okay, so changing 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?