user19853: I have couple of video files with sudden transition from black frame to blue frame, both frames have burned-in frame numbers, I would like to use ffmpeg to define the timestamp of this transition in order to automate the cutting of these files. Is there a possibility to do that. I guess I can either do it with some form of scene detection or by using OCR tool to check the frame number of the current frame and then extract the timestamp. 

user-1: See signalstats filter description, it works in YUV colorspace only.
With it one can extract various per frame video statistics and even graph it in real time.

19853: <p>I have couple of video files with sudden transition from black frame to blue frame, both frames have burned-in frame numbers, I would like to use ffmpeg to define the timestamp of this transition in order to automate the cutting of these files. Is there a possibility to do that. I guess I can either do it with some form of scene detection or by using OCR tool to check the frame number of the current frame and then extract the timestamp. </p>
 -1: <p>See signalstats filter description, it works in YUV colorspace only.
With it one can extract various per frame video statistics and even graph it in real time.</p>
