I'm thinking of extracting the "best" parts of my home video files. Why? Because my videos has a lot uninteresting footage that I don't need wasting disk space.
I thought I'd use -ss and -t to specify the part I want, and -codec copy. Example:
ffmpeg -i iphone4sFullVideo.mov -ss 00:00:10 -t 10 -codec copy iphone4sGoodPart.mp4
I have of course tested this and know this creates a new file with a length of 10 seconds that plays in vlc.
With doing this I think I am getting no loss in quality, and being able to use the mp4-video in a GUI video editor (like Adobe Premiere Elements) later. I was planning to do this with my video files from different phones and camcorders. I got .mts, .mov and .mp4.
My question is kind of advice seeking. Is what I'm thinking of stupid? Will my files be ok after copying a part to an mp4 container?