Hello guys,
Could anyone suggest me a audio and video editor that is reliable, lightweight, free, and easy to use and support the MP4 format?
I wish I could edit audio (insert / delete audio intervals) and remove audio from video and replace with a new audio.
I thank you for the tips that come!

Not too sure which OS you use but for Win/Linux

Going by your description of requirements. Edit audio and mp4 video

mp4 is generally a 'finished format' A bit like 'do all your editing and save in xcf format' but then export the finished off as a jpeg. Very easy in mp4 to lose video/audio sync.

I would say that you need to seperate the video and the audio (demux)
Edit the audio without changing the duration.
Join the video and the audio back together. (mux)

Simple. For this nothing is simple.
Avidemux will split and join video and audio tracks and copy the video without reencoding if possible.
Audacity will edit the audio and superimpose clips on to the main track.

For all things video go to videohelp.com
http://www.videohelp.com/tools/sections ... s-h264-avc
http://www.videohelp.com/tools/sections/audio-editors

This cross-platform combo Avidemux video editor and Audacity audio editor are a good lightweight start.
What is your OS?

Avidemux and Audacity. You might also want to look at Virtualdub.

I forgot that detail ... my OS is win7

Those that you commented, I was aware only of VirtualDub. But what little I read about it, speaks on the need to download plugins as lame and others. Seemed complicated.

The consensus was in avidemux and audacit.
Rich2005, Odinbc and Erisian thank you very much for the suggestions and the links! This has helped me a lot!

VirtualDub & Audacity.
I have used VirtualDub with ffdshow and plugins for years. Without a single crash.
Avidemux is unstable with MP4. I can guarantee it will crash.

Nidhogg,
It was not a beautiful news ...
I'll take it into consideration. Although this VirtualDub and lot of plugins that it needs, scares me.
Thanks for the tip!

There is a pretty good list of video editors here..
https://en.wikipedia.org/wiki/List_of_v ... g_software

You could install Linux in a virtual box and use one of the Linux offerings.

Blender also does video editing with multi-track audio. These tutorials are worth a look, Video Editing in Blender – Introduction & Transitions.

rich2005 is right Videohelp is an excellent resource. Another is Doom9, mainly about DVD conversion but contains good information on audio/video formats and useful programs.

I use Avidemux regularly without issue. MPEG files from other sources are normally the problem it's garbage in, even more garbage out. You have to check for errors before you edit. Video players will automatically resync a bad quality MPEG, a video editor doesn't.

BTW, I agree VirtualDub is great, once you know how to use it.

YaY, i agree.

Amazing how a bit of sunshine and a pint of beer puts you into a good mood..

A quick overview of how I might attempt the original requirement, mp4 video and redo the audio track.

There are other ways and other applications. Normally I use linux for this sort of work but I wanted to see how M$ fares, so this is in a Win7 32 bit virtual machine. Uses Avidemux and Audacity.

having a tidy up - everyone finished with this ...going..going..gone
http://www.youtube.com/watch?v=zVhYnKDTXGM&hd=1 7 minutes

There is a Linux distribution called AVLinux. It is loaded with all kinds of AV programs, so you could test them and see what works best for you. It comes as a live ISO file,so it could be run from a DVD, thumbdrive, or in VirtualBox.

Note quite as easy to use, but ffmpeg/avconv and mencoder does the job for me. For wave editing I use GoldWave, which has been my RockOnRockOn! wave editor since Windows 3.11!!