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diff --git a/hacks/python-playback/ratio.py b/hacks/python-playback/ratio.py
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+++ b/hacks/python-playback/ratio.py
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+# Class to describe a Ratio, and a collection of common
+# (and not-so-common) film ratios collected from Wikipedia.
+
+class Ratio:
+    def __init__(self, ratio, nickname = None):
+        self.nickname = nickname
+        self.ratio = ratio
+
+    # @return presentation name of this ratio
+    def name(self):
+        if self.nickname is not None:
+            return "%.2f (%s)" % (self.ratio, self.nickname)
+        
+        return "%.2f" % self.ratio
+
+ratios = []
+ratios.append(Ratio(1.33, '4:3'))
+ratios.append(Ratio(1.37, 'Academy'))
+ratios.append(Ratio(1.78, '16:9'))
+ratios.append(Ratio(1.85, 'Flat / widescreen'))
+ratios.append(Ratio(2.39, 'CinemaScope / Panavision'))
+ratios.append(Ratio(1.15, 'Movietone'))
+ratios.append(Ratio(1.43, 'IMAX'))
+ratios.append(Ratio(1.5))
+ratios.append(Ratio(1.56, '14:9'))
+ratios.append(Ratio(1.6, '16:10'))
+ratios.append(Ratio(1.67))
+ratios.append(Ratio(2, 'SuperScope'))
+ratios.append(Ratio(2.2, 'Todd-AO'))
+ratios.append(Ratio(2.35, 'Early CinemaScope / Panavision'))
+ratios.append(Ratio(2.37, '21:9'))
+ratios.append(Ratio(2.55, 'CinemaScope 55'))
+ratios.append(Ratio(2.59, 'Cinerama'))
+ratios.append(Ratio(2.76, 'Ultra Panavision'))
+ratios.append(Ratio(2.93, 'MGM Camera 65'))
+ratios.append(Ratio(4, 'Polyvision'))
+
+# Find a Ratio object from a fractional ratio
+def find(ratio):
+    for r in ratios:
+        if r.ratio == ratio:
+            return r
+
+    return None
+
+# @return the ith ratio
+def index_to_ratio(i):
+    return ratios[i]
+
+# @return the index within the ratios list of a given fractional ratio
+def ratio_to_index(r):
+    for i in range(0, len(ratios)):
+        if ratios[i].ratio == r:
+            return i
+
+    return None