Introduction
We plan to make a mobile robot that we can control via smartphone and we can watch the video through a camera on the robot. So for this tutorial we’re going to start with video streaming using a Raspberry Pi and we try to access the video using the Blynk app.
Video
This video shows how to do video streaming using Raspberry Pi camera and Blynk app.
Hardware Preparation
This is the list of items used in the video.
Sample Program
This is python3 sample program to do video streaming using Raspberry Pi camera. Please enable the camera module in the Raspberry Pi configuration.
| # Web streaming example | |
| # Source code from the official PiCamera package | |
| # http://picamera.readthedocs.io/en/latest/recipes2.html#web-streaming | |
| 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='640×480', framerate=24) as camera: | |
| output = StreamingOutput() | |
| #Uncomment the next line to change your Pi's Camera rotation (in degrees) | |
| #camera.rotation = 90 | |
| camera.start_recording(output, format='mjpeg') | |
| try: | |
| address = ('', 8000) | |
| server = StreamingServer(address, StreamingHandler) | |
| server.serve_forever() | |
| finally: | |
| camera.stop_recording() |
Thank You
References:
- Random Nerds: Video Streaming with Raspberry Pi Camera
Thanks for reading this tutorial. If you have any technical inquiries, please post at Cytron Technical Forum.
“Please be reminded, this tutorial is prepared for you to try and learn.
You are encouraged to improve the code for better application.“
