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• how can I enable CRCs in EZstream or FFMPEG ?

  24 novembre 2011, par Nadal

  I want to detect a corrupt MP3 stream, the encoder is using CRC.

  How can I enable CRC ?. I want to be able to read through the headers of each frame to find the CRC, and then run it on the audio data. In the event I get an error (or several frames with errors), I can then somehow trigger a warning.

  I am new to this so I can't tell what to do or how to accomplish this.

• Running a FFMPEG in background not working (it stops after less than 1 second)

  19 mars 2021, par Jintor

  I'm trying to start a ffmpeg but in background because it's in a php triggered by a webhook event.

  


  Scenario :
1- a user start a chat session
2- the user hit a button to stream
3- the server that runs coturn (webrtc server) does a webhook event
4- the server that receives the webhook then enter some values in a database and have the ffmpeg

  


  in this actual scenario : all is working except ffmpeg... the values is entered in mysql

  


  I tried to run ffmpeg in background with nohup or php > /dev/null & like those lines

  


  exec('/usr/bin/nohup /usr/local/bin/php path-to-.php > /dev/null 2>&1 &');

exec('/usr/local/bin/php '.$ffmpeg_cmd." > /dev/null &");

exec('/usr/bin/nohup /usr/local/bin/php '.$ffmpeg_cmd." > /dev/null &");


  


  also added

  


  ignore_user_abort(1);
set_time_limit(0);


  


  Everything I try, it stops after 1 second :( but the ffmpeg have -re attribute to read at input framerate in order to stream live.

  


  when I run the ffmpeg command in a regular shell, all is working fine.

  


  Is there an other way to run a ffmpeg in background ?

  


• FFMPEG gets in never ending condition while live streaming on YouTube

  17 avril 2019, par Nayan Katkani

  I have been working in AS3 to stream 1080P video on YouTube and video gets start uploading and almost 4-5 minutes of the video has been uploaded successfully and afterwards YouTube shows that stream has been ended, but FFMPEG will never hits on "Exit" or any other method even after waiting for next 10 minutes.

  Below is the method I am using.

  public var _nativeProcessStartupInfo:NativeProcessStartupInfo;
  
  public var _processArgs:Vector.<string>;
  
  public var _process:NativeProcess;
  
  protected function StartVideo_clickHandler(event:MouseEvent):void
  
  {
  
      _nativeProcessStartupInfo.executable = File.applicationStorageDirectory.resolvePath("ffmpeg.exe Path");
  
      _processArgs.push('-re');
  
      _processArgs.push('-i');
  
      _processArgs.push(VideoPath);
  
      _processArgs.push('-vcodec');
  
      _processArgs.push('copy');
  
      _processArgs.push('-acodec');
  
      _processArgs.push('copy');
  
      _processArgs.push('-maxrate');
  
      _processArgs.push('4500k');
  
      _processArgs.push('-bufsize');
  
      _processArgs.push('9000k');
  
      _processArgs.push('-pix_fmt'); 
  
      _processArgs.push('yuv422p');
  
      _processArgs.push('-preset');
  
      _processArgs.push('fast');
  
      _processArgs.push('-ac'); 
  
      _processArgs.push('2');
  
      _processArgs.push('-r'); 
  
      _processArgs.push('30');                            
  
      _processArgs.push('-g');
  
      _processArgs.push('60');                            
  
      _processArgs.push('-ar');
  
      _processArgs.push('44100');
  
      _processArgs.push('-f');
  
      _processArgs.push('flv');                   
  
      _processArgs.push(streamurl+'/'+streamname);
  
      _nativeProcessStartupInfo.arguments = _processArgs;
  
      _process = new NativeProcess();
  
      _process.addEventListener(ProgressEvent.STANDARD_OUTPUT_DATA, onOutputData);
  
      _process.addEventListener(ProgressEvent.STANDARD_ERROR_DATA, progress);
  
      _process.addEventListener(NativeProcessExitEvent.EXIT, onExit);
  
      _process.addEventListener(IOErrorEvent.STANDARD_OUTPUT_IO_ERROR, onIOErrorNativeProcess);
  
      _process.addEventListener(IOErrorEvent.STANDARD_ERROR_IO_ERROR, onIOErrorNativeProcess);
  
      _process.start(_nativeProcessStartupInfo);
  
  }
  
  public function onIOErrorNativeProcess(event:IOErrorEvent):void
  
  {
  
      trace(event.toString());
  
  }
  
  public function onOutputData(event:ProgressEvent):void
  
  {
  
      trace("Got: ", _process.standardOutput.readUTFBytes(_process.standardOutput.bytesAvailable)); 
  
  }
  
  public function progress(e:ProgressEvent):void 
  
  {
  
      trace(e);
  
  }
  
  public function onExit(e:NativeProcessExitEvent):void
  
  {
  
      trace(e);
  
  }
  
  </string>

  I have tried with 720P video too by changing bit rate from 4500k to 2500k which is as per YouTube and it is working fine but with 1080P something not went as per expectation.

  Here are the video details :
  Resolution : 1920*1080
  Data Rate : 3220kbps
  FrameRate : 20
  

  Thanks in advance