Trying to remux 2 mp4 sources (starting at pts 0) with slave inputs fails with cannot add a new stream (unsupported while muxing to this format).

Hello

I have the Sample1-only-video.mp4 file - with a video track only.

I have the Sample1-only-audio.mp4 file - with an audio track only.

I wanted to combine these files so that there is video and audio.

I selected "media>convert / save ..."

I selected Sample1-only-video.mp4 as the main file and in the "Play another media ..." I added Sample1-only-audio.mp4

I selected convert/Save

In the profile I have video and audio configured - according to the parameters of the source files.

When the conversion is finished, I only have an audio file in the result. There is no video.

This is a program error.