InBasic

Can you share the files here for testing? You can zip them and drop them here

Can you share the YouTube video link then?

What is the filename of both audio and video files? Can you replace them with video.mp4 and audio.m4a and see if it helps?

are you sure both files are downloaded correctly? make sure their size is not zero. I am going to try to reproduce this.

do you have issues with other conversions tabs too? like converting to mp3?

so most likely the downloaded FFmpeg is corrupted. Try to get a fresh copy and set the path to the new executable in the settings tab.

@FanOfMiku39 the MC&M extension looks at the file extensions to audio and video files. I just tested the latest version and the merging works as expected. Please post sample files...

btw to test your FFmpeg integration, download this sample video file https://www.w3schools.com/htmL/mov_bbb.mp4 and drop it into the audio extractor tab. If it works then the merger tool should work too.

> is there a size limit for MC&M Nope! > Hm, cannot put files bigger than 10MB here and it is zipped Use Dropbox or another file sharing service and...

I am not able to reproduce this. What is the media converter version and your browser version?