I have a bunch of PNG files in separate directories that I'll turn into videos with FFMPEG. Say each clip will be a minute long. I then want to stitch those together into a final video. The final format can be anything YouTube accepts.
So, I need a format that won't lose a lot of quality when the PNGs are encoded the first time, and that doesn't lose any quality when it's concatenated to other videos of the same format (some need to be re-encoded and some behave like UNIX's
cat). They will also each have their own audio tracks which need to stay lined up correctly. So, do any audio formats have problems with this? I can have them in any format.
Also, is there a way to set the video durration longer than then would be assumed? Say I have 48 frames showing at 24 fps. Could I have it make the video 3 seconds instead of 2; holding the last frame for a full second?