How to merge several MP4 files into one?

[Theofilos]

Hello

How to merge several MP4 files into one?

I have VLC 3.0.11.
After selecting File>Open multiple files..., I selected several mp4 files to merge.
At the bottom I selected convert.
This showed up

There is no way to select the destination file, because VLC took both multiple source files (that's good) and multiple destination files (that's bad). There should be one.

Regards

[Lotesdelere]

I'm not sure it's doable with VLC, at least through the GUI. Because VLC is not an editor.

You'd better use a dedicated video editor tool such as AviDemux:
http://avidemux.sourceforge.net

[Theofilos]

Apparently this is possible:
https://docs.videolan.me/vlc-user/3.0/e ... ideos.html

I have 3 MP4 files with audio track only:
sample1.mp4 - 26:44
sample2.mp4 - 0:04
sample3.mp4 - 7:45
I transcoded them just in case, but it doesn't change anything.

I used Mode I.

Code: Select all

vlc sample1.mp4 sample2.mp4 sample3.mp4 --sout="#gather:std{access=file, mux=ts, dst=wynik.mp4}" --sout-keep

Firstly, VLC incorrectly shows a time of 7:52 for the result.mp4 file. The time runs on.




Secondly, the wynik.mp4 has only 26:44, i.e. the files have not been merged.

Why?

[Lotesdelere]

For an MP4 final file you should use mux=mp4, not ts.

[Theofilos]

Thank you very much.
It does indeed work.
So there is an error in the documentation.

One more thing.
After entering the command (under Windows):

Code: Select all

vlc sample1.mp4 sample2.mp4 sample3.mp4 --sout="#gather:std{access=file, mux=mp4, dst=wynik.mp4}" --sout-keep

Three instances of the VLC window appear. Two disappear and one remains.
The resulting file wynik.mp4 has zero value for a very long time.
It is not clear whether to close the window or wait.
Nothing happens in the window.

[Lotesdelere]

I'm sorry but I'm not familiar enough with VLC command line syntax, let's hope a dev will clarify that.

[jimmyjak]

Yeah, merging never seems to finish. File size stays at 0 for a long time, then jumps up to a real value, but the file always stays in use by VLC. When you finally close VLC, the file size jumps up a little more and is properly closed. If you try to play the file, all the audio past file1 is gone. Video plays to the end, but file seems corrupted somehow.

[chrisjj2]

I'm guessing Merge is a misnomer, the operation in fact being Concatenate.