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• ffmpeg - Continuously stream webcam to single .jpg file (overwrite)

  8 octobre 2016, par Germanunkol

  I have installed ffmpeg and mjpeg-streamer. The latter reads a .jpg file from /tmp/stream and outputs it via http onto a website, so I can stream whatever is in that folder through a web browser.

  I wrote a bash script that continuously captures a frame from the webcam and puts it in /tmp/stream :

  while true
  
  do
  
      ffmpeg -f video4linux2 -i /dev/v4l/by-id/usb-Microsoft_Microsoft_LifeCam_VX-5000-video-index0 -vframes 1 /tmp/stream/pic.jpg
  
  done

  This works great, but is very slow ( 1 fps). In the hopes of speeding it up, I want to use a single ffmpeg command which continuously updates the .jpg at, let’s say 10 fps. What I tried was the following :

  ffmpeg -f video4linux2 -r 10 -i /dev/v4l/by-id/usb-Microsoft_Microsoft_LifeCam_VX-5000-video-index0 /tmp/stream/pic.jpg

  However this - understandably - results in the error message :

  [image2 @ 0x1f6c0c0] Could not get frame filename number 2 from pattern '/tmp/stream/pic.jpg'
  
  av_interleaved_write_frame(): Input/output error

  ...because the output pattern is bad for a continuous stream of images.

  Is it possible to stream to just one jpg with ffmpeg ?

  Thanks...

• using ffmpeg plugin with plugin uploaded

  17 avril 2013, par Bruno Ribeiro

  good he uploads the video registers in the database but does not take the print screen of the video and did not register on the database.

      <?
  
      class upload{
  
  
  
          public $vide;
  
          public $dir_video;
  
          public $dir_screen;
  
          //public $id_user;
  
  
  
      //private function video(){
  
      //return isset($_REQUEST["name"]) ? $_REQUEST["name"] : '';
  
      //}
  
  
  
      private function id_user(){
  
      return anti_injection($_GET['id']);
  
      }
  
  
  
      private function get_duration(){
  
          $getID3 = new getID3;
  
          $file = $getID3->analyze($this->video);
  
              return $file['playtime_string'];
  
      }
  
  
  
      private function rand_duration(){
  
      @list($h, $m, $s) = explode(":", $this->get_duration());
  
      $hms = ($h * 3600) + ($m * 60) + $s;
  
      $rhms = rand(0, $hms);
  
      return date('H:i', mktime(0,0,$rhms,0,0,0));
  
  
  
      }
  
  
  
  
  
      private function rand_name(){
  
          $a = base64_encode($this->video);
  
          return @md5(date('Y-m-d H:i:s') * $a);  
  
      }
  
  
  
  
  
      private function get_resolution(){
  
  
  
          $getID3 = new getID3;
  
          $file = $getID3->analyze($this->video);
  
              return $file['video']['resolution_x']."x".$file['video']['resolution_y'];
  
  
  
      }
  
  
  
      private function get_size(){
  
          $getID3 = new getID3;
  
          $file = $getID3->analyze($this->video);
  
              return $file['filesize'];
  
  
  
      }
  
  
  
      private function get_printscreen(){
  
          $cmd = "ffmpeg  -i ".$this->video." -f mjpeg -an -ss ".$this->rand_duration()." -an -vframes 1 -y ".$this->dir_screen.$this->rand_name().".jpg";
  
          return exec($cmd, $output);
  
              //echo "executed command: [".$cmd."] with result: ".print_r($output, true)."<br />\n"; 
  
      }
  
  
  
      private function get_extension($a){
  
  
  
          $arquivo = pathinfo($a);
  
          return $arquivo[&#39;extension&#39;];
  
  
  
      }
  
  
  
      private function verify_extension(){
  
          if($this->get_extension() == "flv"){
  
              return "0";
  
          } else {
  
  
  
              return "1";
  
          }
  
  
  
      }
  
  
  
  
  
  
  
      public function _build(){
  
      // HTTP headers for no cache etc
  
  
  
      /*header("Expires: Mon, 26 Jul 1997 05:00:00 GMT");
  
      header("Last-Modified: " . gmdate("D, d M Y H:i:s") . " GMT");
  
      header("Cache-Control: no-store, no-cache, must-revalidate");
  
      header("Cache-Control: post-check=0, pre-check=0", false);
  
      header("Pragma: no-cache");
  
      */
  
  
  
          session_start();
  
  
  
      // Settings
  
      //$targetDir = ini_get("upload_tmp_dir") . DIRECTORY_SEPARATOR . "plupload";
  
      $targetDir = $this->dir_video;
  
  
  
      //$cleanupTargetDir = false; // Remove old files
  
      //$maxFileAge = 60 * 60; // Temp file age in seconds
  
  
  
      // 5 minutes execution time
  
      @set_time_limit(5 * 60);
  
  
  
      // Uncomment this one to fake upload time
  
      // usleep(5000);
  
  
  
      // Get parameters
  
      $chunk = isset($_REQUEST["chunk"]) ? $_REQUEST["chunk"] : 0;
  
      $chunks = isset($_REQUEST["chunks"]) ? $_REQUEST["chunks"] : 0;
  
      $fileName = isset($_REQUEST["name"]) ? $_REQUEST["name"] : &#39;&#39;;
  
  
  
      // Clean the fileName for security reasons
  
      $fileName = preg_replace(&#39;/[^\w\._]+/&#39;, &#39;&#39;, $fileName);
  
  
  
      // Make sure the fileName is unique but only if chunking is disabled
  
      if ($chunks &lt; 2 &amp;&amp; file_exists($targetDir . DIRECTORY_SEPARATOR . $fileName)) {
  
          $ext = strrpos($fileName, &#39;.&#39;);
  
          $fileName_a = substr($fileName, 0, $ext);
  
          $fileName_b = substr($fileName, $ext);
  
  
  
          $count = 1;
  
          while (file_exists($targetDir . DIRECTORY_SEPARATOR . $fileName_a . &#39;_&#39; . $count . $fileName_b))
  
              $count++;
  
  
  
          $fileName = $fileName_a . &#39;_&#39; . $count . $fileName_b;
  
  
  
      }
  
  
  
      // Create target dir
  
      if (!file_exists($targetDir))
  
          @mkdir($targetDir);
  
  
  
      // Look for the content type header
  
      if (isset($_SERVER["HTTP_CONTENT_TYPE"]))
  
          $contentType = $_SERVER["HTTP_CONTENT_TYPE"];
  
  
  
      if (isset($_SERVER["CONTENT_TYPE"]))
  
          $contentType = $_SERVER["CONTENT_TYPE"];
  
  
  
      // Handle non multipart uploads older WebKit versions didn&#39;t support multipart in HTML5
  
      if (strpos($contentType, "multipart") !== false) {
  
          if (isset($_FILES[&#39;file&#39;][&#39;tmp_name&#39;]) &amp;&amp; is_uploaded_file($_FILES[&#39;file&#39;][&#39;tmp_name&#39;])) {
  
              // Open temp file
  
              $out = fopen($targetDir . DIRECTORY_SEPARATOR . $fileName, $chunk == 0 ? "wb" : "ab");
  
              if ($out) {
  
                  // Read binary input stream and append it to temp file
  
                  $in = fopen($_FILES[&#39;file&#39;][&#39;tmp_name&#39;], "rb");
  
  
  
                  if ($in) {
  
                      while ($buff = fread($in, 4096))
  
                          fwrite($out, $buff);
  
                  } else
  
                      die(&#39;{"jsonrpc" : "2.0", "error" : {"code": 101, "message": "Failed to open input stream."}, "id" : "id"}&#39;);
  
                  fclose($in);
  
                  fclose($out);
  
                  @unlink($_FILES[&#39;file&#39;][&#39;tmp_name&#39;]);
  
              } else
  
                  die(&#39;{"jsonrpc" : "2.0", "error" : {"code": 102, "message": "Failed to open output stream."}, "id" : "id"}&#39;);
  
          } else
  
              die(&#39;{"jsonrpc" : "2.0", "error" : {"code": 103, "message": "Failed to move uploaded file."}, "id" : "id"}&#39;);
  
      } else {
  
          // Open temp file
  
          $out = fopen($targetDir . DIRECTORY_SEPARATOR . $fileName, $chunk == 0 ? "wb" : "ab");
  
          if ($out) {
  
              // Read binary input stream and append it to temp file
  
              $in = fopen("php://input", "rb");
  
  
  
              if ($in) {
  
                  while ($buff = fread($in, 4096))
  
                      fwrite($out, $buff);
  
              } else
  
                  die(&#39;{"jsonrpc" : "2.0", "error" : {"code": 101, "message": "Failed to open input stream."}, "id" : "id"}&#39;);
  
  
  
              fclose($in);
  
              fclose($out);
  
          } else
  
              die(&#39;{"jsonrpc" : "2.0", "error" : {"code": 102, "message": "Failed to open output stream."}, "id" : "id"}&#39;);
  
      }
  
      $photoName = $_FILES[&#39;file&#39;][&#39;name&#39;];
  
  
  
      $exploded_photoName = explode(&#39;.&#39;, $photoName);
  
  
  
      $user_id = $_SESSION[&#39;SESS_MEMBER_ID&#39;];
  
  
  
      if(!isset($_SESSION[$photoName])) {
  
  
  
          $_SESSION[$photoName] = &#39;1&#39;;
  
      }
  
  
  
      if($chunk==1){
  
  
  
          $this->get_printscreen();
  
  
  
          mysql_query("INSERT INTO video 
  
          (poster_id,video,titulo,extension,screen,duration,resolucao,tamanho) 
  
                      VALUES
  
          (&#39;".$this->id_user()."&#39;,&#39;$fileName&#39;,&#39;$exploded_photoName[0]&#39;,&#39;".$this->get_extension($fileName)."&#39;,&#39;".$this->rand_name().".jpg&#39;,&#39;".$this->get_duration()."&#39;,&#39;".$this->get_resolution()."&#39;,&#39;".$this->get_size()."&#39;)")
  
          or die(mysql_error());
  
  
  
  
  
      }
  
      // Return JSON-RPC response
  
      die(&#39;{"jsonrpc" : "2.0", "result" : null, "id" : "id"}&#39;);
  
  
  
  
  
          //$this->get_printscreen(); 
  
          //return print $this->video();
  
          //return print $this->rand_name();  
  
      }
  
  
  
  
  
      }
  
  
  
  ?>

  I'm using the class to become more organized and clean, but I can not get the information from the video and get the printscreen using the plugin class and uploaded.

• select audio channels with ffmpeg [on hold]

  4 août 2015, par Jecki

  im pushing my stream to shoutcast server using ffmpeg to decode the stream , right now im using the following :

  ffmpeg -loglevel quiet -i udp ://@224.5.0.122:5000 -eng 96000 -f s16le
  -f alsa pcm.pulse

  im trying to select audio from track2 using

  -map 0:1

  ffmpeg -loglevel quiet -i -map 0:a:1 udp ://@224.3.0.222:5000 -ar
  96000 -f s16le -f alsa pcm.pulse

  option and its always give me audio signal delayed

  any advise what i’m missing here

  Regards