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• Encoding MJPEG from webcam in UWP development with C#

  24 avril 2018, par Federico Parra

  this is my first question in StackOverflow.

  How can I encode video being captured from webcam as a MJPEG using C# in UWP enviroment (Visual Studio 2017) ?
  Perhaps using FFMPEG or DirectShow ? Any particular bindings required to use them in UWP ?

  I’ve been through these walk-throughs trying to go the official way using MediaCapture :

  https://docs.microsoft.com/en-us/windows/uwp/audio-video-camera/basic-photo-video-and-audio-capture-with-mediacapture
  https://docs.microsoft.com/en-us/uwp/api/windows.media.capture.mediacapture

  According to Microsoft though, there is no MJPEG encoder included in MediaEncoder (only decoder) : https://docs.microsoft.com/en-us/windows/uwp/audio-video-camera/supported-codecs

  About FFMPEG UWP integration, I found this :
  https://github.com/Microsoft/FFmpegInterop
  https://blogs.windows.com/buildingapps/2015/06/05/using-ffmpeg-in-windows-applications/#HHYbWAVcM7LhkvYZ.97

  But it’s geared towards decoding, and I want to encode.

  Just in case someone is wondering, I want to use MJPEG for Two reasons :
  1) less CPU intensive (much less) because it doesn’t do inter-frame compression, means my Surface Pro (and other similar computers) will keep quiet without fans running like crazy
  2) I need all frames (i.e. not one every 30) to be crystal clear because of an algorithm I need to run on each of them after

  Any pointers would be greatly appreciated.

  Thank you,
  Federico

• Configuring PHPVideoToolkit library

  21 novembre 2013, par mrpotatohead

  I'm trying to set up PHPVideoToolkit to use for converting videos on a server and can't seem to get the documentation/examples working. After setting the basic configuration, as well as making some slight changes to even be able to see the documentation I'm getting the following error (among others) :

  Declaration of PHPVideoToolkit\FfmpegProcess::getExecBuffer() should be compatible
  
  with that of PHPVideoToolkit\ProcessBuilder::getExecBuffer()

  and this one, several times :

  Undefined offset: 2
  
          [2] => /var/www/media_html/phpvideotoolkit-v2/src/PHPVideoToolkit/FfmpegParserAbstract.php

  After digging around for a little bit in various source files I realized I'm probably doing more harm than good changing stuff around and am probably doing something wrong.
  I'm stumped as to how to fix this so thanks in advance to anyone who knows how to.

• FFMPEG : First seconds of video from RTSP stream are frozen

  18 août 2022, par Christopher Wilke

  I am running a basic FFMPEG RTSP stream command :

  


  ffmpeg -rtsp_transprt tcp -i rtsp://someurl:8554/mystream recording.mp4


  


  The video seems to be frozen for the first seconds. Why is that ? Can I do something to prevent this ?