Avidemux Forum

I have converted a VOB file to MP4 using handbrake converter . This tool was the only video converter that was able to do the conversion Perfect without Narrowing the video to squashed !! I tried just about all other video editor/ convertors - Handbrake is the Only one that does it.
But Now when I use Avidemux to trim this video using "copy" vide Only mode , the same thing happens again & the video is squashed. What other Free Alternatives can I use to trim the mp4 video without Loosing the Header information that Handbrake had put in