*. Supports various codecs such as xvid, MPEG, DVDs, MP4, ASF, etc.
*. Can copy multimedia files from one container to another without encoding.
*. Easy to use GUI.
*. Various video and audio effects.
*. Crop, change/calculate bit-rate, audio boost, etc.
*. Change frame-rate.
*. Supports FFmpeg libraries.
*. Change out-put file size.
...are just a few to name. So, if you use Ubuntu and want to give it a try, then first download this package. Now double click it and install it first. After that, open your Terminal and issue the below command to install Avidemux.
sudo apt-get update && sudo apt-get install avidemux
That's it, enjoy!.