Yes, I have already tried this variant. Always the same, stream 2 is not loaded. Unfortunately the stream cannot be uploaded. So you can take a look at it. Is there another way to do this? Thanks.

When project properties set to 3D i also see only one video track, "Stream 1", but that's totally normal. That's a 3D event. What you see on the preview window?

When i set project settings 3D to off and drop 3d clip to timeline, Vegas will split left and right view to 2 tracks, so you will see Stream 1 and Stream 2. Thats also normal.
 

Sorry for the late reply. In your first description, I only see the preview stream as stream 1. In the second description I see stream 1+2 as I wanted. Did you recommend that I work like that? If I want to render the finished film in 3D, do I first change the corresponding 3D format in the render menu? Thanks for the valuable information.

" In your first description, I only see the preview stream as stream 1"

OK, but if you change the preview window to anaglyph you see its 3D, right?

Then, no worry, edit like in first description, just like me. As i said its normal.
Yes, rendering it a different story. You choose 3D format in render panel.

Sorry for the late reply.

OK, but if you change the preview window to anaglyph you see its 3D, right? = No it is only as Stream 1.

Even if I export the video (all 3D settings are made) only stream 1 is used. The strange thing is, if I start the project directly from Explorer, I can select stream 1 and 2. But in the timeline I only ever see one stream.

strange, without any uploaded sample (a new recording) i cannot say anything

I would like to send you an original stream. But these are in the MTS, which cannot be uploaded. Do I have another way to send you the original 3D stream?  The next problem is the sound, I rendered the entire film about 20 minutes after it was shown. The sound then gets worse and worse until it disappears completely after 15 minutes. Here's an example too.

what? cannot upload MTS??? how?
no youtube link of course..

google drive, wetransfer, transfernow.net, sendgb, filemail

lot of possibilities

Hello, thanks for the information. What annoys me even more is that I also export normal films. The sound gets worse and worse and then goes away after 15 minutes. I installed Vegas 22.Pro on another computer and exactly the same thing happened here. The sound goes away after 15 minutes. The 3D problems described also occur here. I'm currently at a loss. Am I the only one having these problems?