I can put a multiple audio tracks video in the timeline. Can I also render a video with multiple tracks and how?
Note: I mean the audio tracks in the result video, not the tracks in the editor

This blog entry says that Kdenlive 20.08 has initial support for multiple audio stream:
https://kdenlive.org/en/2020/08/kdenlive-20-08-is-out/

Is this what you mean?

pseco wrote: Is this what you mean?

Yes and no. All I can see it's about editing video clips with multiple audio tracks. But what I want is creating a multiple audio tracks video.

Any audio track that is not muted/disabled will be rendered. So if you have a main audio track with speak or music, yuu can have additional audio tracks with effects of background music. This is with one output audio track, I have not at this point in time tried the multiple audio track feature. That is for having audio in multiple languages, for example.

bigboss97 wrote:Yes and no. All I can see it's about editing video clips with multiple audio tracks. But what I want is creating a multiple audio tracks video.

Do you know if any proprietary software has this feature?

pseco wrote:

bigboss97 wrote:Yes and no. All I can see it's about editing video clips with multiple audio tracks. But what I want is creating a multiple audio tracks video.

Do you know if any proprietary software has this feature?

https://ardour.org/ has video editing and is a audio multi track recorder and editor.

Soundtrack Editors
Sample accurate sync and shared transport control with video playback tools allows Ardour to provide a fast and natural environment for creating and editing soundtracks for film and video projects.

kritpopcha wrote:https://ardour.org/ has video editing and is a audio multi track recorder and editor.

Thanks a lot my guess is that @bigboss97 wants to cut and operate on all audio tracks at the same time as the video so everything stays in sync. He didn't say what kind of operations he plans to do with Kdenlive. It would help if he did so.

pseco wrote:He didn't say what kind of operations he plans to do with Kdenlive. It would help if he did so.

OK, let explain the whole story from the very beginning...
I was digitalizing my S-VHS tapes. The software came with my USB dongle refused to work properly. So I used OBS which I've used from time to time and never really under stood the concept
I thought recording 2 tracks means stereo. When I put my recording on kdenlive I then realize there are actually two stereo tracks. When I played my recording on VLC I could select playing audio track 1 or 2. To be honest, I didn't know that video file can have multiple audio tracks
Since kdenlive can open multiple audio tracks I was wondering whether it can render/generate multiple audio tracks video, too. For instance, in kdenlive I have two tracks, one instrumental only and two with vocal. I want to render the video with two separate audio tracks and later I can select the audio track in the player (e.g. VLC) and sing karaoke.

If you are not going to make any video or audio editing at all, you shouldn't use Kdenlive for that. You can merge several audio tracks with mkvtoolnix, which is the proper way.
Also, I would recommend hardware for "s-vhs digitalisieren", instead of the blunt way of capturing the screen or recording with a video camera the TV. I don't know what kind of video editing you I already asked but you didn't say. I cannot help you like that you don't know how to explain yourself.

pseco wrote:If you are not going to make any video or audio editing at all, you shouldn't use Kdenlive for that. You can merge several audio tracks with mkvtoolnix, which is the proper way.

Thanks for the suggestion.
Again, I don't have any intention to merge or mix audio tracks. I want them to be rendered/saved separately in one single video file, as suggested in the subject. It's just a simple question and all relevant information are in my first post.

What you did with mp4 can be done the same with mkv. It's not making stereo by having 2 mono tracks, they keep separate.

sredna wrote:I have not at this point in time tried the multiple audio track feature. That is for having audio in multiple languages, for example.

This is exactly what I mean
I couldn't find any settings in render. I didn't expect this is a very common feature. Since I saw that kdenlive can import multiple audio tracks clips I was hoping that it can render multiple audio tracks, too.

Adding such tracks to Kdenlive would be only useful if you do non-linear video editing, like cutting and merging lots of stuff. If you just to color correction and other things that don't affect the timeline you can use lots of utilities like ffmpeg, MP4Box, mkvtoolnix, etc. etc. to do the thing of adding several languages. Don't do that with Kdenlive.
As I said that would only make sense if you do non-linear video editing and you want to keep audio in sync with video.

On the other side, if you want to do non-linear video editing, you can perform the edit on the video with a single audio stream (mono, stereo), and export it. Then reopen the project but have on input file the other audio stream (replace them) and the project will take care for you to export with the a new video file the the other audio stream, keeping all the edits and transformation in place. Then with additional tools as I said, you extract both audio streams and merge them into the output video and you have that.

You have lots of options and ways to do it, it's a matter of having some imagination.

pseco wrote:Adding such tracks to Kdenlive would be only useful if you do non-linear video editing, like cutting and merging lots of stuff.

Correct, I'm using kdenlive to do video with lots of effects. Otherwise I would raise my question differently.

bigboss97 wrote:

pseco wrote:Adding such tracks to Kdenlive would be only useful if you do non-linear video editing, like cutting and merging lots of stuff.

Correct, I'm using kdenlive to do video with lots of effects. Otherwise I would raise my question differently.

Then do everything with source video and one audio stream. Then reopen the project with same source video and the other audio stream, the project should preserve all configuration. After that merge the two results.