picamera Copy_to test

copy_to.py

import random
import picamera
import sys
from picamera.frames import PiVideoFrameType

def find_seconds(stream, seconds, first_frame=PiVideoFrameType.sps_header):
    pos = None
    last = None
    seconds = int(seconds * 1000000)
    for frame in reversed(stream.frames):
        print('Frame position: {}'.format(frame.position))
        if first_frame in (None, frame.frame_type):
            print('First frame found: {}'.format(frame.position))
            pos = frame.position
        if frame.timestamp is not None:
            print('Frame timestamp: {}'.format(frame.timestamp))
            if last is None:
                last = frame.timestamp
            elif last - frame.timestamp >= seconds:
                print('Elapsed: {}'.format(last - frame.timestamp))
                break
    return pos

camera = picamera.PiCamera(resolution="1080p", framerate=30)
stream = picamera.PiCameraCircularIO(camera, seconds=20)
camera.start_recording(stream, format='h264')
try:
    while True:
        camera.wait_recording(10)
        pos = find_seconds(stream, seconds=5)
        print('Pos: {}'.format(pos))
        stream.copy_to('motion.h264', seconds=5)
        sys.exit(0)
finally:
    camera.stop_recording()