Of Mp4 | Index

def build_frame_index(self, stts, stss, stsc, stco, stsz): # Expand run-length encoded time deltas # Map each sample to its chunk and byte offset # Mark keyframes using stss # Append to self.sample_index

SELECT * FROM frames WHERE timestamp >= 10 AND is_keyframe = 1

Great for scripting and batch downloads. curl -O http://example.com/video.mp4