Store sync settings into the movie file, note: this does not include logic for deserializing sync settings and passing them to the core when loading a movie

BizHawk.Client.Common/movie/HeaderKeys.cs

@@ -20,7 +20,7 @@ namespace BizHawk.Client.Common
 		public const string FIRMWARESHA1 = "FirmwareSHA1";
 		public const string PAL = "PAL";
 		public const string BOARDNAME = "BoardName";
-
+		public const string SYNCSETTINGS = "SyncSettings";
 		// Core Setting
 		public const string CORE = "Core";
 

BizHawk.Client.Common/movie/IMovieHeader.cs

@@ -13,6 +13,7 @@ namespace BizHawk.Client.Common
 		string SavestateBinaryBase64Blob { get; set; }
 		string GameName { get; set; }
 		string SystemID { get; set; }
+		string SyncSettingsJson { get; set; }
 
 		/// <summary>
 		/// Receives a line and attempts to add as a header

BizHawk.Client.Common/movie/MovieHeader.cs

@@ -35,6 +35,24 @@ namespace BizHawk.Client.Common
 			}
 		}
 
+		public string SyncSettingsJson
+		{
+			get
+			{
+				if (ContainsKey(HeaderKeys.SYNCSETTINGS))
+				{
+					return this[HeaderKeys.SYNCSETTINGS];
+				}
+
+				return string.Empty;
+			}
+
+			set
+			{
+				this[HeaderKeys.SYNCSETTINGS] = value;
+			}
+		}
+
 		public ulong Rerecords
 		{
 			get

BizHawk.Client.EmuHawk/movie/RecordMovie.cs

@@ -15,6 +15,8 @@ using BizHawk.Emulation.Cores.Consoles.Sega.gpgx;
 
 using System.Reflection;
 
+using Newtonsoft.Json;
+
 namespace BizHawk.Client.EmuHawk
 {
 	public partial class RecordMovie : Form
@@ -94,10 +96,15 @@ namespace BizHawk.Client.EmuHawk
 				}
 
 				// Header
+
 				_movieToRecord.Header[HeaderKeys.AUTHOR] = AuthorBox.Text;
 				_movieToRecord.Header[HeaderKeys.EMULATIONVERSION] = VersionInfo.GetEmuVersion();
 				_movieToRecord.Header[HeaderKeys.MOVIEVERSION] = HeaderKeys.MovieVersion1;
 				_movieToRecord.Header[HeaderKeys.PLATFORM] = Global.Game.System;
+
+				// Sync Settings, for movies 1.0, just dump a json blob into a header line
+				_movieToRecord.Header[HeaderKeys.SYNCSETTINGS] = JsonConvert.SerializeObject(Global.Emulator.GetSyncSettings());
+
 				if (Global.Game != null)
 				{
 					_movieToRecord.Header[HeaderKeys.GAMENAME] = PathManager.FilesystemSafeName(Global.Game);