I need to test an OpenGL shader that renders YUV420P (and other YUV formats) into RGB. Decoding a video just for that would be too much.
Are there any image samples with Y, U, and V buffers for me to send to the shader?
On google I only found old websites that no longer host these images.
Maybe there's a way to easily extract a frame from any video using ffmpeg?
Maybe there's a way to easily extract a frame from any video using ffmpeg?
(1) For converting existing image (eg: PNG):
ffmpeg -i test.png -pix_fmt yuv420p test.yuv
(2) For converting video by frame (eg: extract image at video frame xx number):
ffmpeg -i test.mp4 -pix_fmt yuv420p -vf "select=eq(n\,xx)" -frames:v 1 test.yuv
(3) For converting video by timestamp (eg: extract a specific time's frame, ss is in HH:MM:SS format):
ffmpeg -ss 00:23:00 -i test.mp4 -pix_fmt yuv420p -frames:v 1 test.yuv
PS: Whether video or image, if you need a specific resolution use the video filter scale, where either one of those width or height in the W:H setting can be replaced with -1 to keep the aspect ratio (if needed):
ffmpeg -i test.png -pix_fmt yuv420p -vf "scale=1280:720" test.yuv
You can just generate one using ffmpeg.
ffmpeg -f lavfi -i testsrc2=s=1280x720,format=yuv420p -vframes 1 sample.yuv
Note that this is planar layout, so first all Y samples, then U, then V.