Adding mp3's to mp4's

[wowggbad]

Ive got a video that's 1280x720.mp4, its amazing HD on youtube and its 351MB.
One problem, the program I use to encode my video files does not allow me to add separate audio.
Originally the file video file was 6.5GB, now its down to 351MB and its amazingly good looking...
I just wish I could add audio to it with out much trouble. (windows movie maker hates .mp4's)
I tried quicktime and Sony Vegas. Both of them are slow and end up putting out crappy video quality.

I will try to add more info soon.

[Bjs]

Welcome wowggbad

Please download a program called gspot, unzip, and launch the program ... next > File > Open ... search for that mp4 and take a snap shot of what is reported and post in next reply ... from this we can help you choose a suitable program to perform this task correctly.

And editing 1280x720, especially in preview mode will take time.

[Baldrick]

Use a multiplexer to just add audio to a video, like for mp4 use YAMB.

[wowggbad]

Use a multiplexer to just add audio to a video, like for mp4 use YAMB.

this worked and was fast, thanks for the help.