Stream any ffmpeg input to web (Posix only). make sure the input works first by trying the command

README.md

video.mp4

Write stream with mplayer to fifo file (ram)

mkfifo in
mplayer -dumpstream video.mp4 -dumpfile in

main.py

from flask import Flask, Response
import subprocess
import io
import select


app = Flask(__name__)


stream_sync = False


@app.route('/')
def index():
    return """
<video src="/stream" controls autoplay muted width="200" height="200"></video>
"""

@app.route('/stream')
def stream_video():
    
    # Set the command to loop the video using ffmpeg
    command = 'ffmpeg -i in -movflags frag_keyframe+empty_moov -f mp4 -'.split()

    # Start ffmpeg process
    ffmpeg_process = subprocess.Popen(command, stdout=subprocess.PIPE, stderr=subprocess.DEVNULL, bufsize=10**8)
    pull = select.poll()
    pull.register(ffmpeg_process.stdout, select.POLLIN)

    def generate():
        global stream_sync
        while True:
            # Read video chunk
            chunk = ffmpeg_process.stdout.read(1024)
            if not stream_sync:
                while pull.poll(1):
                    ffmpeg_process.stdout.read(1024)
                stream_sync = True
            if not chunk:
                break
            yield chunk

    # Set response headers for streaming
    headers = {
        'Content-Type': 'video/mp4',
        'Accept-Ranges': 'bytes'
    }

    # Return the response with the generator function
    return Response(generate(), headers=headers)

if __name__ == '__main__':
    app.run(debug=True, host='0.0.0.0', port=8000)