I have videos I want to split across multiple screens, so the solution I've found so far is to just crop the input video 4 times with ffmpeg (is this optimal? Is there some other way so I only need to use one command?)
Anyways, in ffmpeg crop is a video filter, and it seems that I can't specify the video codec as copy when using a video filter. Why is this the case? It seems like nothing should change if I just remove some of the video. I should be perfectly capable of just copying the same video over, with just part of it removed.
Is there any way for me to do a crop in ffmpeg without having to do a re-encode? The extra encoding time makes my processing times really long and the new bitrates caused by the re-encode makes the video parts out of sync and unable to be played properly.