changed ChapterImageResolution in model to enum type;

added 144p to the ImageResolution enum;
updated chapters limit comment inside FFProbeVideoInfo.cs;

MediaBrowser.Model/Drawing/ImageResolution.cs

@@ -5,6 +5,16 @@ namespace MediaBrowser.Model.Drawing
     /// </summary>
     public enum ImageResolution
     {
+        /// <summary>
+        /// MatchSource.
+        /// </summary>
+        MatchSource,
+
+        /// <summary>
+        /// 144p.
+        /// </summary>
+        P144,
+
         /// <summary>
         /// 240p.
         /// </summary>