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• On-the-fly transcoding using derolf/transcoder

  8 septembre 2015, par user1811678

  https://github.com/derolf/transcoder

  I need to transcode locally and playback locally in my project, no other external connection to the server.
  It is a good source of doing on the fly transcoding by ffmpeg.

  In my case i have to transcode it to mp4 as it could perform faster.
  However i run into following problem, and i need some help in here to fix it.

  ----------------------------------------
  
  Exception happened during processing of request from ('127.0.0.1', 34089)
  
  Traceback (most recent call last):
  
    File "/usr/lib/python2.7/SocketServer.py", line 593, in process_request_thread
  
      self.finish_request(request, client_address)
  
    File "/usr/lib/python2.7/SocketServer.py", line 334, in finish_request
  
      self.RequestHandlerClass(request, client_address, self)
  
    File "/usr/lib/python2.7/SocketServer.py", line 651, in __init__
  
      self.finish()
  
    File "/usr/lib/python2.7/SocketServer.py", line 710, in finish
  
      self.wfile.close()
  
    File "/usr/lib/python2.7/socket.py", line 279, in close
  
      self.flush()
  
    File "/usr/lib/python2.7/socket.py", line 303, in flush
  
      self._sock.sendall(view[write_offset:write_offset+buffer_size])
  
  error: [Errno 32] Broken pipe

  Here is my code :
  server.py

      from flask import Flask, request, Response, abort, send_file, jsonify
  
  import os, subprocess, re
  
  import config
  
  
  
  app = Flask(__name__)
  
  
  
  @app.route('/media/.js')
  
  def media_content_js(path):
  
      d= os.path.abspath( os.path.join( config.media_folder, path ) )
  
      print d
  
      if not os.path.isfile( d ): abort(404)
  
      cmdline= list()
  
      cmdline.append( config.ffmpeg )
  
      cmdline.append( "-i" )
  
      cmdline.append( d );
  
      print cmdline
  
      duration= -1
  
      FNULL = open(os.devnull, 'w')
  
      proc= subprocess.Popen( cmdline, stderr=subprocess.PIPE, stdout=FNULL )
  
      try:
  
          for line in iter(proc.stderr.readline,''):
  
              line= line.rstrip()
  
              #Duration: 00:00:45.13, start: 0.000000, bitrate: 302 kb/s
  
              m = re.search('Duration: (..):(..):(..)\...', line)
  
              if m is not None: duration= int(m.group(1)) * 3600 + int(m.group(2)) * 60 + int(m.group(3)) + 1
  
      finally:
  
          proc.kill()
  
  
  
      return jsonify(duration=duration)
  
  
  
  @app.route('/media/.mp4')
  
  def media_content_ogv(path):
  
      d= os.path.abspath( os.path.join( config.media_folder, path ) )
  
      print d
  
      if not os.path.isfile( d ): abort(404)
  
      start= request.args.get("start") or 0
  
      print start
  
      def generate():
  
          cmdline= list()
  
          cmdline.append( config.ffmpeg )
  
          cmdline.append( "-i" )
  
          cmdline.append( d );
  
          cmdline.append( "-ss" )
  
          cmdline.append( str(start) );
  
          cmdline.extend( config.ffmpeg_args )
  
          print cmdline
  
          FNULL = open(os.devnull, 'w')
  
          proc= subprocess.Popen( cmdline, stdout=subprocess.PIPE, stderr=FNULL )
  
          try:
  
              f= proc.stdout
  
              byte = f.read(512)
  
              while byte:
  
                  yield byte
  
                  byte = f.read(512)
  
          finally:
  
              proc.kill()
  
  
  
      return Response(response=generate(),status=200,mimetype='video/mp4',headers={'Access-Control-Allow-Origin': '*', "Content-Type":"video/mp4","Content-Disposition":"inline","Content-Transfer-Enconding":"binary"})
  
  
  
  @app.route('/', defaults={"path":"index.html"})
  
  @app.route('/')
  
  def static_content(path):
  
      d= os.path.abspath( os.path.join( config.static_folder, path ) )
  
      if not os.path.isfile( d ): abort(404)
  
      return send_file( d )
  
  
  
  app.run( host="0.0.0.0",port=config.port, threaded=True, debug=True )

  config.py

  media_folder=   "media"
  
  static_folder=  "static"
  
  port=       8123
  
  ffmpeg=     "/usr/bin/ffmpeg"
  
  
  
  ffmpeg_args=    [ "-f", "avi" ,"-acodec", "libfdk_aac", "-b:a", "128k", "-vcodec", "libx264", "-b:v", "1200k" , "-flags" , "+aic+mv4", "pipe:1"]

  index.html

      
  
      <code class="echappe-js">&lt;script src=&quot;http://vjs.zencdn.net/4.5/video.js&quot;&gt;&lt;/script&gt;
      
  &lt;script src=&quot;http://code.jquery.com/jquery-1.9.1.min.js&quot;&gt;&lt;/script&gt;
      
  &lt;script&gt;<br />
  
          var video= videojs('video');<br />
  
          video.src(&quot;media/testavi.avi.mp4&quot;);<br />
  
  <br />
  
          // hack duration<br />
  
          video.duration= function() { return video.theDuration; };<br />
  
          video.start= 0;<br />
  
          video.oldCurrentTime= video.currentTime;<br />
  
          video.currentTime= function(time) <br />
  
          { <br />
  
              if( time == undefined )<br />
  
              {<br />
  
                  return video.oldCurrentTime() + video.start;<br />
  
              }<br />
  
              console.log(time)<br />
  
              video.start= time;<br />
  
              video.oldCurrentTime(0);<br />
  
              video.src(&quot;media/testavi.avi.mp4?start=&quot; + time);<br />
  
              video.play();<br />
  
              return this;<br />
  
          };<br />
  
  <br />
  
          $.getJSON( &quot;media/testavi.avi.js&quot;, function( data ) <br />
  
          {<br />
  
              video.theDuration= data.duration;<br />
  
          });<br />
  
      &lt;/script&gt;
  

• ffmpeg node js s3 stream screenshots qestion

  20 octobre 2015, par user3564443

  On my Node js server I need get video from s3, generate thumbnail for it, set thumbnail to s3, without saving video or thumbnail on my server. So I need to use streams for this. For thumbnail generation I use fluent-ffmpeg.

  Is it possible to get screenshots from streams using fluent-ffmpeg ?

  Is the correct way to intercept s3 getObject stream, that there was no need to download full video ?

  var config = require('../config');
  
  var AWS = require('aws-sdk');
  
  AWS.config.update({
  
    accessKeyId: config.AWS_accessKeyId,
  
    secretAccessKey: config.AWS_secretAccessKey,
  
    region: 'eu-west-1'
  
  });
  
  var s3 = new AWS.S3();
  
  var fs = require('fs');
  
  var ffmpeg = require('fluent-ffmpeg');
  
  
  
  exports.generateVideoThumbnail = function(fileId, url, done) {
  
    var params = {
  
      Bucket: config.AWS_bucket,
  
      Key: url
  
    };
  
    var input = s3.getObject(params);
  
    var stream = fs.createWriteStream('./screenshot.png');
  
    return ffmpeg(input).screenshots({
  
      timestamps: ['0.1', '0.2'],
  
      size: '200x200'
  
    }).output('./screenshot.png').output(stream).on('error', function(err) {
  
      return done(err);
  
    }).on('end', function() {
  
      input.close();
  
      var _key = "files/" + fileId + "/thumbnail.png";
  
      return s3.putObject({
  
        Bucket: config.AWS_bucket,
  
        Key: _key,
  
        Body: stream,
  
        ContentType: 'image/jpeg'
  
      }, function(err) {
  
        return done(err);
  
      });
  
    });
  
  };

• ffmpeg streaming camera with directshow

  17 novembre 2015, par atu0830

  I am trying use ffmpeg to streaming one camera. The command is

  ffmpeg.exe -y  -f dshow -i video="AmCam" -c:v copy  -framerate 7.5 -map 0:0 -f ssegment -segment_time 4 -segment_format mpegts  -segment_list "web\stream.m3u8"  -segment_list_size 720  -segment_list_flags live  -segment_wrap 10 -segment_list_type m3u8  "web\segments\s%%d.ts"

  And I create a html in web folder

                                        
  
                                  
  
                                       
  
                                    
  
      <video controls="controls" width="720" height="405" autoplay="autoplay">   
  
          <source src="stream.m3u8" type="application/x-mpegURL"></source>           
  
      </video>                                    
  
                                       
  
   

  All ts file generated but looking Safari on iPad looding but it always show dark player and loading