Make probesize and analyzeduration configurable and simplify circular

dependencies

Makes the probesize and analyzeduration configurable with env args.
(`JELLYFIN_FFmpeg_probesize` and `FFmpeg_analyzeduration`)

MediaBrowser.Controller/Extensions/ConfigurationExtensions.cs

@@ -0,0 +1,36 @@
+using Microsoft.Extensions.Configuration;
+
+namespace MediaBrowser.Controller.Extensions
+{
+    /// <summary>
+    /// Configuration extensions for <c>MediaBrowser.Controller</c>.
+    /// </summary>
+    public static class ConfigurationExtensions
+    {
+        /// <summary>
+        /// The key for the FFmpeg probe size option.
+        /// </summary>
+        public const string FfmpegProbeSizeKey = "FFmpeg_probesize";
+
+        /// <summary>
+        /// The key for the FFmpeg analyse duration option.
+        /// </summary>
+        public const string FfmpegAnalyzeDuration = "FFmpeg_analyzeduration";
+
+        /// <summary>
+        /// Retrieves the FFmpeg probe size from the <see cref="IConfiguration" />.
+        /// </summary>
+        /// <param name="configuration">This configuration.</param>
+        /// <returns>The FFmpeg probe size option.</returns>
+        public static string GetProbeSize(this IConfiguration configuration)
+            => configuration[FfmpegProbeSizeKey];
+
+        /// <summary>
+        /// Retrieves the FFmpeg analyse duration from the <see cref="IConfiguration" />.
+        /// </summary>
+        /// <param name="configuration">This configuration.</param>
+        /// <returns>The FFmpeg analyse duration option.</returns>
+        public static string GetAnalyzeDuration(this IConfiguration configuration)
+            => configuration[FfmpegAnalyzeDuration];
+    }
+}