Raspberry Pi 3 + Camera Module 2 ：Video Streaming
測試1：利用Youtube或者Facebook (來源：國外教學)
Step 1 ：先開啟樹梅派鏡頭使用(raspi-config)
Step 2 ：安裝套件
sudo apt-get install libav-tools
Step 3 ：到Youtube或Facebook直播設定的地方取得KEY
Step 4 ：Youtube的話打開樹梅派終端機，輸入
raspivid -o - -t 0 -vf -hf -fps 20 -b 600000 -w 1280 -h 720 | ffmpeg -re -ar 44100 -ac 2 -acodec pcm_s16le -f s16le -ac 2 -i /dev/zero -f h264 -i - -vcodec copy -acodec aac -ab 128k -g 10 -strict experimental -f flv rtmp://a.rtmp.youtube.com/live2/你的直播KEY
Step 5 ：Facebook的話一樣打開樹梅派終端機，輸入
raspivid -o - -t 0 -vf -hf -fps 10 -b 500000 | ffmpeg -re -ar 44100 -ac 2 -acodec pcm_s16le -f s16le -ac 2 -i /dev/zero -f h264 -i - -vcodec copy -acodec aac -ab 128k -g 50 -strict experimental -f flv rtmp://rtmp-api.facebook.com:80/rtmp/你的直播KEY
Step 6 ：實際測試都可以使用，但Youtube延遲較嚴重，可透過參數改變來改善，像是-fps後面的偵數、-b後面的bit rate、-g後面接的是關鍵Frame每隔幾偵加入一個(因為是H.264，如果影像一直變動，建議改小，讓畫面更新快一點)、可在bit rate後面加入-w和-h，這是畫面解析度，不更改的話預設是1920*1080
測試2：利用樹梅派開啟HTTP SERVER來串流(除非樹梅派有實體IP，不然只有區網下可見)
Step 1 ：創建一個python檔
Step 2 ：輸入以下程式 (來源：國外教學)
import io
import picamera
import logging
import socketserver
from threading import Condition
from http import server
PAGE="""\
<html>
<head>
<title>Raspberry Pi - Surveillance Camera</title>
</head>
<body>
<center><h1>Raspberry Pi - Surveillance Camera</h1></center>
<center><img src="stream.mjpg" width="640" height="480"></center>
</body>
</html>
"""
class StreamingOutput(object):
def __init__(self):
self.frame = None
self.buffer = io.BytesIO()
self.condition = Condition()
def write(self, buf):
if buf.startswith(b'\xff\xd8'):
# New frame, copy the existing buffer's content and notify all
# clients it's available
self.buffer.truncate()
with self.condition:
self.frame = self.buffer.getvalue()
self.condition.notify_all()
self.buffer.seek(0)
return self.buffer.write(buf)
class StreamingHandler(server.BaseHTTPRequestHandler):
def do_GET(self):
if self.path == '/':
self.send_response(301)
self.send_header('Location', '/index.html')
self.end_headers()
elif self.path == '/index.html':
content = PAGE.encode('utf-8')
self.send_response(200)
self.send_header('Content-Type', 'text/html')
self.send_header('Content-Length', len(content))
self.end_headers()
self.wfile.write(content)
elif self.path == '/stream.mjpg':
self.send_response(200)
self.send_header('Age', 0)
self.send_header('Cache-Control', 'no-cache, private')
self.send_header('Pragma', 'no-cache')
self.send_header('Content-Type', 'multipart/x-mixed-replace; boundary=FRAME')
self.end_headers()
try:
while True:
with output.condition:
output.condition.wait()
frame = output.frame
self.wfile.write(b'--FRAME\r\n')
self.send_header('Content-Type', 'image/jpeg')
self.send_header('Content-Length', len(frame))
self.end_headers()
self.wfile.write(frame)
self.wfile.write(b'\r\n')
except Exception as e:
logging.warning(
'Removed streaming client %s: %s',
self.client_address, str(e))
else:
self.send_error(404)
self.end_headers()
class StreamingServer(socketserver.ThreadingMixIn, server.HTTPServer):
allow_reuse_address = True
daemon_threads = True
with picamera.PiCamera(resolution='640x480', framerate=24) as camera:
output = StreamingOutput()
camera.start_recording(output, format='mjpeg')
try:
address = ('', 8000)
server = StreamingServer(address, StreamingHandler)
server.serve_forever()
finally:
camera.stop_recording()
Step 3 ：同個網段下的裝置，只要在瀏覽器輸入"樹梅派IP:8000"，就可以瀏覽到即時影像(幾乎0延遲)
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