Noob Seeks Assistance - with File Merging

[LieutenantFrost]

My apologies in advance if Im posting this in the wrong place.

Let me say first that I have almost zero experience with any video editing.

My problem - I'd been using an addon for Firefox to capture videos from youtube. Sometimes this works flawlessly, others it splits the video and the audio into separate files. A Video file and a sound file of various formats.

What Im trying to find out is, if there a program free or paid, that will allow me to merge them back together again? OR if there is another way I can Merge them into one file.

Any suggestions at all would be much appreciated!

thanks

[Clockwork]

I'd been using an addon for Firefox to capture videos from youtube.

Well...don't leave us hanging...

What's the name of the add-on?

[TorBru]

Clockwork: Video DownloadHelper has some sort of screen capture thingy.

L.Frost: You can use FFmpeg to join the files with a command like:

ffmpeg -i "path/to/video" -i "path/to/audio" -map 0:0 -map 1:0 -c:v copy -c:a copy "path/to/av-joined"

If you would like a graphical interface you could use FFQueue. Create a preset with video codec = copy, audio codec = copy. Create a job with video as input #1 and audio as input #2, select the preset and the name for the output file, save job and start queue and that's it.

[Baldrick]

Or use a multiplexer like mkvmergegui, load your first video file and then click append to join the rest files. Mux/make a new single mkv.

But please give more information about the video files if you want more ideas.