I am creating a video with ffmpeg by stringing together a bunch of PNG files. The resulting video has horizontal lines running across it and the colors are not accurate. Here's the command I used:
ffmpeg -framerate 1 -i img%04d.png -pix_fmt yuv420p timer.mp4
I am attaching an example of one of the input PNG files and a frame from the video. Can anyone tell what's wrong?