MP4 Multiplexer

[koberulz]

Trying to find a good one. Tried YAMB, but it muxes a 29.97fps video at 25fps, ruining sync. MP4Multiplexer works perfectly up until about halfway through the clip at which point the audio stops, then starts from the beginning while the video continues on.

[El Heggunte]

YAMB is an outdated and limited GUI for MP4Box.

Just use the real thing, or ffmpeg, or L-Smash's muxer.exe

[koberulz]

You've mistaken me for someone who can use a CLI.

Nonetheless, after a bit of Googling I tried this:

mp4box -add track1.h264:fps=23.970 -add track2.m4a#audio -new res.mp4

And got the same result I got in YAMB.

I have no idea how to find muxer.exe or use ffmpeg to mux. Google is no help on either front.

[luigizaninoni]

Try Ffqueue. It is a GUI for ffmpeg, very easy to use

[ricardouk]

My-MP4Box-GUI
https://www.videohelp.com/software/My-MP4Box-GUI

[koberulz]

Try Ffqueue. It is a GUI for ffmpeg, very easy to use

Evidently not; it crashes every time I try to start muxing.

Found this:

ffmpeg -i audio.m4a -i video.h264 -acodec copy -vcodec copy output.mp4

Kind of works, but I get an error about the streams not using global headers and the container requiring them. Still get a watchable video in VLC, but I'm not sure if there's an issue there that'll potentially crop up later on in a different media player or something. It doesn't have the film strip graphic around the thumbnail in Windows Explorer, either.

[Nasick]

For me VLC Player and MX Player is much more better. I love to use those.

[SameSelf]

I can confirm that I use the MP4Box cli all the time to mux .264 and .aac streams at 29.97 fps without a hitch. Fast and easy. In fact, it is an integral part of my workflow when I am generating content for the wide world webs. I don't recall the exact cmd because I am not at my PC, but I can guarantee it is plain vanilla, nothing fancy, and works every time. If you are having problems, I would suspect the input files are the problem, not MP4Box. How are you generating your audio stream? Perhaps you can post short synced clips of each, and someone here can try to mux?

[koberulz]

Haven't had an issue yet with the files generated with the ffmpeg command I posted above, so that seems to have done the trick.