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• Unable to Play Video Stream on Flask-FFmpeg Media Server on Subsequent Requests

  12 juin 2024, par yternal

  Problem Description :

  


  I am trying to create a media server using Flask and FFmpeg. The server converts an RTSP stream to FLV format for playback in a web browser, and I am testing it using ffplay. The server starts successfully, and the data returned from the first request can be played using ffplay. However, when I interrupt the ffplay request and make it again, ffplay is unable to play the video and displays an "Invalid data found when processing input" error.

  


  I am using the following command to test with ffplay :

  


  ffplay http://127.0.0.1:8000/flv/0


  


  My current Flask code：

  


  import queue
import subprocess
import threading

from flask import Flask, Response, stream_with_context
from gevent import monkey
from gevent.pool import Pool
from gevent.pywsgi import WSGIServer
from geventwebsocket.handler import WebSocketHandler
from loguru import logger

monkey.patch_all()
app = Flask(__name__)

stream_queue = queue.Queue(maxsize=10000)


def update_stream():
    process = subprocess.Popen(
        ['ffmpeg', '-i', 'rtsp://192.168.1.168/0', '-f', 'flv', '-'],
        stdout=subprocess.PIPE,
        stderr=subprocess.PIPE
    )
    while True:
        data = process.stdout.read(4096)
        if not data:
            break
        if stream_queue.full():
            stream_queue.get()
        stream_queue.put(data)
        logger.debug(f"stream_queue size: {stream_queue.qsize()}")


@app.route('/flv/')
def flv_stream(stream_id):
    @stream_with_context
    def generate():

        while True:
            data = stream_queue.get()
            yield data

    return Response(generate(), mimetype='video/x-flv')


if __name__ == '__main__':
    HOST = "0.0.0.0"
    PORT = 8000

    threading.Thread(target=update_stream, daemon=True).start()

    logger.info(f"listen in: {HOST}:{PORT}")
    pool = Pool(10000)
    http_serve = WSGIServer((HOST, PORT), app, handler_class=WebSocketHandler, spawn=pool)
    http_serve.max_accept = 30000
    http_serve.serve_forever()


  


  The error message when attempting to play the stream again with ffplay is :

  


  http://127.0.0.1:8000/flv/0: Invalid data found when processing input


  


  I tried adding some parameters to FFmpeg, such as analyzeduration and probesize, but it had no effect.

  


• Prepare mp4 videos for Media Source Extensions API using ffmpeg

  6 février 2018, par ler

  This command produce init.mp4 + bunch of m4s files, i’m trying to play them using MSE :

  ffmpeg -i <input file="file" /> -f hls -hls_segment_type fmp4 -c:v copy playlist.m3u8

  This is the client side code i’m using :

  var socket = io();
  
  var video = document.querySelector('video');
  
  var mimeCodec = 'video/mp4; codecs="avc1.64000d,mp4a.40.2"'; 
  
  if ('MediaSource' in window && MediaSource.isTypeSupported(mimeCodec)) {
  
      var mediaSource = new MediaSource;
  
      video.src = URL.createObjectURL(mediaSource);
  
      mediaSource.addEventListener('sourceopen', sourceOpen);
  
  } else {
  
      console.error('Unsupported MIME type or codec: ', mimeCodec);
  
  }
  
  function sourceOpen (_) {
  
    var mediaSource = this;
  
    var sourceBuffer = mediaSource.addSourceBuffer(mimeCodec);
  
    sourceBuffer.mode = 'sequence'; 
  
    socket.on('broadcast', function (newPiece) {
  
        // here i'm getting the buffer of the video  == buffer
  
        sourceBuffer.addEventListener('updateend', function (_) {
  
          video.play().then(function() { }).catch(function(error) { });
  
        });
  
        sourceBuffer.appendBuffer(buffer); // when the seconde video comes i append it's buffer
  
    })
  
  };

  Everything works fine when i send init.mp4 file followed by playlist0.m4s, playlist1.m4s, playlist2.m4s, .....
  But when i try to play init.mp4 file followed immediately 6,7,8 not 0,1,2 meaning playlist6.m4s, playlist7.m4s, playlist8.m4s, ...., it didn’t work.
  I don’t know why, this supposed to be live video, the viewer that is watching the live from the beginning gets init.mp4, playlist0.m4s, playlist1.m4s, playlist2.m4s, .....
  Someone that came after 5 minutes gets something like this init.mp4, playlist32.m4s, playlist33.m4s, playlist34.m4s, .... and so on, but so far it works only for the viewer that get’s init.mp4, playlist0.m4s, playlist1.m4s, playlist2.m4s, ..... the video can’t play for the others

• Revision 101691 : Le précédent commit autorisait à saisir les valeurs min/max d’un nombre ...

  13 janvier 2017, par maieul@… — Log

  Le précédent commit autorisait à saisir les valeurs min/max d’un nombre
  décimal en mettant une virgule plutôt qu’un point.
  Il faut donc qu’on puisse tester à partir de ces valeurs avec virgule…