Update from_timecode to work with 3-digit framerates

Author: RikerG

src/opentime/rationalTime.cpp

@@ -246,12 +246,14 @@ RationalTime::from_timecode(
     {
         // split the fields
         unsigned int last_pos = 0;
-        for (unsigned int i = 0; i < 4; i++)
+        for (unsigned int i = 0; i < 3; i++)
         {
             fields[i] = timecode.substr(last_pos, 2);
             last_pos  = last_pos + 3;
         }
 
+        fields[3] = timecode.substr(last_pos, timecode.length() - last_pos);
+      
         hours   = std::stoi(fields[0]);
         minutes = std::stoi(fields[1]);
         seconds = std::stoi(fields[2]);

tests/test_opentime.py

@@ -418,6 +418,23 @@ def test_to_timecode_120(self):
         t = otio.opentime.RationalTime(value=120, rate=120)
         self.assertEqual(timecode, otio.opentime.to_timecode(t, rate=120))
 
+    def test_from_timecode_120(self):
+        timecode = "00:00:00:000"
+        t = otio.opentime.RationalTime(value=0, rate=120)
+        self.assertEqual(t, otio.opentime.from_timecode(timecode, rate=120))
+
+        timecode = "00:00:00:010"
+        t = otio.opentime.RationalTime(value=10, rate=120)
+        self.assertEqual(t, otio.opentime.from_timecode(timecode, rate=120))
+
+        timecode = "00:00:00:119"
+        t = otio.opentime.RationalTime(value=119, rate=120)
+        self.assertEqual(t, otio.opentime.from_timecode(timecode, rate=120))
+
+        timecode = "00:00:01:000"
+        t = otio.opentime.RationalTime(value=120, rate=120)
+        self.assertEqual(t, otio.opentime.from_timecode(timecode, rate=120))
+
     def test_faulty_formatted_timecode_24(self):
         """
         01:00:13;23 is drop-frame timecode, which only applies for