Merging/Muxing separate offline video and audio stream into one file

[stylerda9]

Hey Guys!

As mentioned above I'd like to merge two files using VLC. The video stream file is an *.mp4 (AVC), the audio stream file is a *.webm (Opus).

The first thing I did was to play the audio synchronously to the video stream. Then I tried both converting and saving without conversion, but always end up with one file containing just the (converted) video stream without the audio.

Could anyone suggest how to get it done the right way, please?