.NET (Core and Framework)

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Dim font As New Font("Segoe UI", 9, FontStyle.Regular)

' The character you want to check (e.g., the copyright symbol ©)
Dim specialChar As Char = "⬤"

' Check if the font can display the character
Dim canDisplayChar As Boolean = TextRenderer.MeasureText(specialChar, font).Width > 0
If canDisplayChar Then
    Return "⬤"
Else
    Return "X"
End If

using System.Runtime.InteropServices;
using FFmpeg.AutoGen;
using SixLabors.ImageSharp.Formats.Png;
using SixLabors.ImageSharp.Formats;

Class Program
{
    unsafe static void Main(string[] args)
    {
string inputUrl = "rtsp://wowzaec2demo.streamlock.net/vod/mp4:BigBuckBunny_115k.mp4"; 


ffmpeg.avformat_open_input(&pFormatContext, inputUrl, null, null);

System.NotSupportedException
  HResult=0x80131515
  Message=Specified method is not supported.
  Source=FFmpeg.AutoGen
  StackTrace:
   at FFmpeg.AutoGen.DynamicallyLoadedBindings.<>c.<Initialize>b__2_1284(AVFormatContext** <p0>, String <p1>, AVInputFormat* <p2>, AVDictionary** <p3>)
   at FFmpeg.AutoGen.ffmpeg.avformat_open_input(AVFormatContext** ps, String url, AVInputFormat* fmt, AVDictionary** options)
   at Program.Main(String[] args)

dim URL as string = webView21.Source.ToString()