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• How can I fix 'Missing system type and architecture' error when downloading FFmpeg library in Maui.net ?

  2 juin 2023, par Alhusseen Alfalahy

  Missing system type and architecture when Xabe.FFmpeg.Downloader.FFmpegDownloader.GetLatestVersion in Maui.net

  


  I was trying to run the FFmpeg library download code and I always get this error

  


  Missing system type and architecture

  


  Steps to replicate the problem

  


  Create a new Maui project

  


  Install NuGet Xabe.FFmpeg.Downloader

  


  This is the homepage code

  


  namespace MauiApp1;

public partial class MainPage : ContentPage
{
    // A button to download FFmpeg
    private Button Button;

    public MainPage()
    {
        Button = new() { Text = "Download FFmpeg" };

        Button.Clicked += Button_Clicked;

        Content = new StackLayout()
        {
            Children =
            {
                Button
            }
        };
    }

    private async void Button_Clicked(object sender, EventArgs e)
    {
        try
        {
            var status = await Permissions.CheckStatusAsync();
            if (status != PermissionStatus.Granted)
            {
                status = await Permissions.RequestAsync();
            }

            status = await Permissions.CheckStatusAsync();
            if (status != PermissionStatus.Granted)
            {
                status = await Permissions.RequestAsync();
            }

            if (status == PermissionStatus.Granted)
            {

                await Xabe.FFmpeg.Downloader.FFmpegDownloader.GetLatestVersion(Xabe.FFmpeg.Downloader.FFmpegVersion.Official);
                //await Xabe.FFmpeg.Downloader.FFmpegDownloader.GetLatestVersion(Xabe.FFmpeg.Downloader.FFmpegVersion.Android);
                //await Xabe.FFmpeg.Downloader.FFmpegDownloader.GetLatestVersion(Xabe.FFmpeg.Downloader.FFmpegVersion.Official, Path.Combine(Environment.GetFolderPath(Environment.SpecialFolder.LocalApplicationData), "FFmpeg"));
                //await Xabe.FFmpeg.Downloader.FFmpegDownloader.GetLatestVersion(Xabe.FFmpeg.Downloader.FFmpegVersion.Android, Path.Combine(Environment.GetFolderPath(Environment.SpecialFolder.LocalApplicationData), "FFmpeg"));


                await DisplayAlert("Install", "Install completed successfully", "OK");
            }
        }
        catch (Exception ex)
        {
            // Show an alert message with exception message 
            await DisplayAlert("Install Failed", $"An error occurred: {ex.Message}", "OK");
        }
    }
}


  


  These are file access permissions on Android

  


  
    
    


  


• vaapi_encode_h265 : Ensure that ref pics are always in the RPS

  25 janvier 2019, par Mark Thompson

  vaapi_encode_h265 : Ensure that ref pics are always in the RPS
  When making a new P-frame when B-frames are present the previous P-frame
  
  is normally in the DPB because it will be referred to by subsequent
  
  B-frames.  However, this is not true if there are no B-frames, or in edge
  
  cases where a GOP ends with two P-frames.  Fix this by adding the direct
  
  ref pics to the RPS explicitly.
  Fixes #7699.
  Tested-by : Ullysses A Eoff <ullysses.a.eoff@intel.com>
  

  • [DH] libavcodec/vaapi_encode_h265.c

• How to draw - dynamic - "safe areas" in ffplay

  16 juin 2023, par F.O.R.A.R.T.

  we need to preview videos with overlayed so-called "safe areas" according to this EBU document : SAFE AREAS FOR 16:9 TELEVISION PRODUCTION.

  


  Here's the scheme for 1080p resolution :
1080p Safe Areas

  


  Those consist of three different "zones", each with the same percentage size-to-the-edge of the video frame for any resolution :

  


  

  • Action Safe Area (GREEN box) : 3.5%

  


  • Graphics Safe Area (RED box) : 5%

  


  • 4:3 Safe Area (GREY box) : 16.25%

  


  


  It should be easily achieveable using the drawbox command, but how can be dynamically adapted to any video resolution ?