Upload thumbnails to S3

NostrStreamer/Services/Thumbnail/BaseThumbnailService.cs

@@ -0,0 +1,29 @@
+using FFMpegCore;
+using NostrStreamer.Database;
+
+namespace NostrStreamer.Services.Thumbnail;
+
+public abstract class BaseThumbnailService
+{
+    protected readonly ILogger Logger;
+    protected readonly Config Config;
+
+    protected BaseThumbnailService(Config config, ILogger logger)
+    {
+        Config = config;
+        Logger = logger;
+    }
+
+    protected async Task<string> GenerateThumbnail(UserStream stream)
+    {
+        var path = Path.ChangeExtension(Path.GetTempFileName(), ".jpg");
+        var cmd = FFMpegArguments
+            .FromUrlInput(new Uri(Config.RtmpHost, $"{stream.Endpoint.App}/source/{stream.User.StreamKey}?vhost=hls.zap.stream"))
+            .OutputToFile(path, true, o => { o.ForceFormat("image2").WithCustomArgument("-vframes 1"); })
+            .CancellableThrough(new CancellationTokenSource(TimeSpan.FromSeconds(10)).Token);
+
+        Logger.LogInformation("Running command {cmd}", cmd.Arguments);
+        await cmd.ProcessAsynchronously();
+        return path;
+    }
+}