I have a Panasonic Lumix dmc-zs20 (which is primarily a still/photo camera but can be used for HD video). When you film a video it is saved as an individual MP4 file. I have previously used Ultra Video Joiner software to join all my individual video files. I am having problems with Ultra Video Joiner software in that the sound and picture do not match up. I would like someone to:
(i) inform me of free or cheap software to join MP4 files which I can download for future use
(ii) inform me of free or cheap software to compress the joined file which I can download for future use
(iii) join 3 of my files together just as an simple exercise/example
(iv) compress this joined file for loading on youtube (given a 30 second video file is approx 80mb) without losing too much quality.
(v) identify the software in (i) and (ii) and provide instructions for the steps in (iii) and (iv) that I can follow in future to join MP4 files and then compress them.