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• Programmatically get non-overlapping images from MP4

  16 novembre 2019, par Carlos F

  My ultimate goal is to get meaningful snapshots from MP4 videos that are either 30 min or 1 hour long. "Meaningful" is a bit ambitious, so I have simplified my requirements.

  The image should be crisp - non-overlapping, and ideally not blurry. Initially, I thought getting a keyframe would work, but I had no idea that keyframes could have overlapping images embedded in them like this :

  Of course, some keyframe images look like this and those are much better :

  

  I was wondering if someone might have source code to :

  Take a sequence of say 10-15 continuous keyframes (jpg or png) and identify the best keyframe from all of them.

  This must happen entirely programmatically. I found this paper : http://research.microsoft.com/pubs/68802/blur_determination_compressed.pdf

  and felt that I could "rank" a few images based on the above paper, but then I was dissuaded by this link : Extracting DCT coefficients from encoded images and video given that my source video is an MP4. Of course, this confuses me because the input into the system is just a sequence of jpg images.

  Another link that is interesting is :

  Detection of Blur in Images/Video sequences

  However, I am not sure if this will work for "overlapping" images.

• How to setup FFMPEGInterop to Use DRM playready

  1er novembre 2019, par marinamovies32

  I am using FFMPEGInterop class to play UWP video. I need to play it with playready setup but am running into issues.

  I can play playready with just mediaplayerelement and creating the protection manager, but when I create a FFMPEGMSS to stream it, than it fails. Says value is out of range when adding the protection manager to the MediaStreamSource.

  var StreamSource = FFmpegMSS.GetMediaStreamSource();
  
  var protectionManager = new Windows.Media.Protection.MediaProtectionManager();
  
  Windows.Foundation.Collections.PropertySet cpSystems = new Windows.Foundation.Collections.PropertySet();
  
  cpSystems.Add("{F4637010-03C3-42CD-B932-B48ADF3A6A54}", "Microsoft.Media.PlayReadyClient.PlayReadyWinRTTrustedInput"); //Playready
  
  protectionManager.Properties.Add("Windows.Media.Protection.MediaProtectionSystemIdMapping", cpSystems);
  
  protectionManager.Properties.Add("Windows.Media.Protection.MediaProtectionSystemId", "{F4637010-03C3-42CD-B932-B48ADF3A6A54}");
  
  protectionManager.ServiceRequested += ProtectionManager_ServiceRequested;
  
  protectionManager.ComponentLoadFailed += ProtectionManager_ComponentLoadFailed;
  
  
  
  protectionManager.Properties.Add("Windows.Media.Protection.MediaProtectionContainerGuid", "{9A04F079-9840-4286-AB92-E65BE0885F95}");
  
  
  
  var supportsHardwareDrm = PlayReadyStatics.CheckSupportedHardware(PlayReadyHardwareDRMFeatures.HardwareDRM);
  
  if (!supportsHardwareDrm)
  
  {
  
      protectionManager.Properties["Windows.Media.Protection.UseSoftwareProtectionLayer"] = true;
  
  }
  
  Windows.Storage.ApplicationDataContainer localSettings = Windows.Storage.ApplicationData.Current.LocalSettings;
  
  
  
  Header.Text = supportsHardwareDrm ? "SUPPORTED" : "NOT SUPPRTED";
  
  
  
  StreamSource.MediaProtectionManager = protectionManager;
  
  
  
  mediaElement.Source = MediaSource.CreateFromMediaStreamSource(StreamSource);

  I should be able to play playready DRM with a setup protection manager to start but down get any info on it so confused on the next step for it.

• Using Windows named pipes with ffmpeg pipes (Doesnt work)

  25 octobre 2019, par Estr

  I’m trying to send audio and video RAW through c# pipes to FFMPEG, I’ve been reading and trying to follow what’s shown here : https://docs.microsoft.com/en-us/dotnet/api/system.io.pipes.namedpipeserverstream?view=netframework-4.8

  This a fragment of the code...

          NamedPipeServerStream p_1;
  
          NamedPipeServerStream p_2;
  
          p_1 = new NamedPipeServerStream("p_1", PipeDirection.Out, 1, PipeTransmissionMode.Byte);
  
          p_2 = new NamedPipeServerStream("p_2", PipeDirection.Out, 1, PipeTransmissionMode.Byte);
  
  
  
          p_1.WaitForConnection();
  
  
  
          p_2.WaitForConnection();

  .......

  I run this command in FFMPEG : ffmpeg.exe -i \.\pipe\p_1 -vcodec hevc -r 8 -f alaw -ar:a 16000 -ac:a 1 -i \.\pipe\p_2 o.mp4

  But the program stays on the line : p_2.WaitForConnection() ;

  How can I solve it ?