Compress Video Problem

[are an]

I have a problem when compress the video. I use some software to convert such as handbrake, movavi and movie maker. After I convert to MP4 file, I cannot get the same video as original. The duration of video has been changes. Someone please help me.

 

[Grobe]

By how much? You talk milliseconds? Is the source video file corrupt?
Is both video and audio of same duration in source?