How to glue mp4 and m4a?

Question

Video

I confess in this area a complete zero. Is there anything opersours and to glue with a couple of clicks? The main thing is that without loss of quality

Answer 1

I know it's a belated answer, but it might help someone.
Download ffmpeg https://ffmpeg.zeranoe.com/builds/ (under Windows)
, unpack the archive, run the command line, go to the bin directory and type the following command.
where:
videoplayback.mp4 and videoplayback.m4a - source files, of course, if they are not in the directory with ffmpeg.exe, then specify the full path
output.mp4 - output file, already with an audio track.