support imdb ids from plex (#393)

CHANGELOG.md

@@ -4,6 +4,9 @@ All notable changes to this project will be documented in this file.
 The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.0.0/).
 
 ## [Unreleased]
+### Added
+- Support IMDB ids from Plex libraries, which may improve Trakt matching for some items
+
 ### Fixed
 - Include Specials/Season 0 `episode-num` entry in XMLTV
 - Fix some transcoding edge cases with VAAPI and pixel formats `yuv420p10le`, `yuv444p10le` and `yuv444p`

ErsatzTV.Infrastructure/Plex/PlexServerApiClient.cs

@@ -801,6 +801,13 @@ namespace ErsatzTV.Infrastructure.Plex
             {
                 return guid;
             }
+            
+            if (guid.StartsWith("com.plexapp.agents.imdb"))
+            {
+                string strip1 = guid.Replace("com.plexapp.agents.imdb://", string.Empty);
+                string strip2 = strip1.Split("?").Head();
+                return $"imdb://{strip2}";
+            }
 
             if (guid.StartsWith("com.plexapp.agents.thetvdb"))
             {