By Louai Abu-Osba -
Hey all,
Hope you had great Christmases, for those of you that observe it.
Two questions about FFMPEG:?
How do I transcode from a source with an unpremultiplied alpha to an output format that gets premultiplied against black? Is it possible?
Do the expressions for the size flag work? I've tried doing things like this:
ffmpeg input.mov -s (%W/2)x(%H/2) output.mov
But it just returns a "Invalid frame size error". What's the easiest way to scale a video down without hard coding numbers in there?
Thanks!
-louai