Avidemux appears to be the ultimate editor, but...
The problems begin immediately, because it's the only editor whose audio and video are almost always out of synch (when they weren't in to raw video), and often wildly so. You can easily adjust synchronization by typing in the milliseconds of difference, but it can be very tedious to find the exact amount, and you'd better do it before you edit anything (you'll see why in a moment).
The editing itself is precise, and different button sets make it easy to move back and forth - better than all other free editors. But once you've finished, the easy part ends.
"Copy" to the same format is very fast if you've done everything right, but for conversion, you'd better know exactly what format and codec go together or you'll get an error message until you find the right combination.
And when you do, you may then get the worst error message of all - one that tells you you haven't started on a "key frame." In that case, you have no choice but to start over. In fact, if you want to change any edit you can't undo it - you have to undo ALL of them - and start over.
Little quirks involve having to name the new file yourself, and there's no button to delete a scene, you have to right click and select "delete" from the menu. And if you want to do something like cropping the video, processing then can become amazingly slow.
So while this is the most full-featured editor out there, I've given up on it until it becomes more user friendly.
Excellent free program to edit video format H 264 and MP4.
My SDV.MP4 from a Samsung digital camera opens in all programs with the height too high.
This is the only program that I have found that will edit SDV.MP4 video in height and width so that it appears normal and it can do a faultless.
It can also open HDV.mp4 (Click preview)
Then WOW I can edit one part of the video and also CUT OUT part of the Top/Bottom/Left/Right of the video (Any numbers must multiply by 8)
Can edit and save the video in another format if required.
Bit of a STEEP learning curve to do all this and much more but keep at it it is worth it.
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