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• Internet explorer does not support HTML5 video with height greater than 1088px

  25 novembre 2015, par evilguc

  The company I’m working at writing a web app which allows users to work with media files uploaded from mobile devices.

  To unify HTML5 video sources I decided to convert all the videos using H.264 codec in mp4 container and setting width to 1280px.

  During the fixing one of the issues with an app I decided to use 4:3 video file with 256x240px resolution. Since I convert all the files to HD resulting file became 1280x1200px and for some reason it isn’t playable in IE10 and IE11 (in other browsers going well).

  So I spend a lot of time trying to figure out the reason.

• 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

• low quality movie with avconv

  8 novembre 2017, par masoud

  I want to create a movie from a sequence of images. I used avconv (linux System in our Company has only avconv and not ffmpeg package). to do that first I creates ’fig%0d.png’ Images and then by calling subprocess command I create a movie :

  subprocess.call('avconv -framerate 1 -f image2 -i fig%0d.png -c:v h264 -crf 1 Temp_electron1.mp4'.split())

  but the Quality of the movie is not good and more importantly the movie doesn’t Show the first Image and always starts from the second one.

  I appreciate any suggestion