added extra send_previous() to all code except the Toshiba_SD590, because it needs the pause and single send_previous() to sync correctly.

dawn/Synchronizer_Philips_DVP3142_12/Synchronizer_Philips_DVP3142_12.pde

@@ -27,7 +27,7 @@ int pinLED=13; // The heartbeat LED on the board
 int heartbeat=0;
 int secs;
 // Sarcity 20:58
-int playtime= 20*60+57;      // Play time in seconds, you usually leave off a second or two
+int playtime= 22*60+10;      // Play time in seconds, you usually leave off a second or two
 
 //int  playtime= 10;      // testing
 
@@ -39,8 +39,7 @@ void setup() {
   Serial.begin(115200);
 
   Serial.println("Panasonic DVD DVP-3142/12  Synchronizer $Rev$");
-  Serial.println("For \"Sarcity\" by Thor Elis (1981)
-  ");
+  Serial.println("For \"Sarcity\" by Thor Elis (1981)");
   Serial.println("Code by Joe Foley <foley@ru.is>");
   Serial.println("$URL$");
   Serial.println("$Id$");
@@ -55,15 +54,18 @@ void setup() {
     Serial.println("");
 
   secs=playtime;
-
+  send_play();
 }
 
 /********************************************************************/
 void loop() {
   Serial.println("Sync");
-  send_pause();
-  waitsec(2);
+  //send_pause();
+  //waitsec(2);
 
+  // The three players don't always see the "previous command" so we send it multiple times
+  send_previous();
+  send_previous();
   send_previous();
   //waitsec(2);      
   // Don't send play because previous automatically starts it
@@ -108,7 +110,7 @@ void waitsec(int sec) {
 void send_stop() { 
   // First comes the pre-data bits, then the command code
     Serial.println(" stop");
-    irsend.sendNEC(0x10431,20); 
+    irsend.sendRC6(0x10431,20); 
 }
 
 /********************************************************************/

dawn/Synchronizer_Scott_DVX605HD/Synchronizer_Scott_DVX605HD.pde

@@ -56,14 +56,16 @@ void setup() {
 /********************************************************************/
 void loop() {
   Serial.println("Sync");
-  send_pause();
-  waitsec(2);
+  //send_pause();
+  //waitsec(2);
 
+  send_previous();
+  send_previous();
   send_previous();
   //waitsec(2);      
   // Don't send play because previous automatically starts it
   // If we hit play it will merely pause it.
-  send_play();  
+  //send_play();  
 
   for(int t = 0; t < playtime; t++) {
     // This will not give us perfect 1 second timing
@@ -110,19 +112,19 @@ void send_stop() {
 void send_play() { 
   // First comes the pre-data bits, then the command code
     Serial.println(" play");
-    irsend.sendRC6(0xFFF00F,32); 
+    irsend.sendNEC(0xFFF00F,32); 
 }
 
 /********************************************************************/
 void send_pause() { 
   // First comes the pre-data bits, then the command code
   Serial.println("  pause");
-  irsend.sendRC6(0xFFD02F,32); 
+  irsend.sendNEC(0xFFD02F,32); 
 }	
 
 /********************************************************************/
 void send_previous() {  
   // First comes the pre-data bits, then the command code
   Serial.println(" previous");
-  irsend.sendRC6(0xFF50AF, 32); 
-}
+  irsend.sendNEC(0xFF50AF, 32); 
+}

dawn/Synchronizer_Toshiba_SD590EKE/Synchronizer_Toshiba_SD590EKE.pde

@@ -46,9 +46,9 @@ void setup() {
     Serial.print(secs % 60);
     Serial.println("");
 
-  // The DVD player starts playing automatically, so we should pause it
-  send_pause();
-  waitsec(2);
+  // The DVD player starts playing automatically, so maybe we should pause it
+  //send_pause();
+  //waitsec(2);
   secs=playtime;
 
 }
@@ -57,12 +57,11 @@ void setup() {
 void loop() {
   Serial.println("Sync");
   send_pause();
-  waitsec(2);
-
+  waitsec(2);      
   send_previous();
   //waitsec(2);      
 
-  send_play();  // this should not be necessary, but just in case
+  //send_play();  // this should not be necessary, but just in case
   for(int t = 0; t < playtime; t++) {
     // This will not give us perfect 1 second timing
     //   but it is good enough for most video applications