diff --git a/movie.py b/movie.py
new file mode 100644
index 0000000..d644d5c
--- /dev/null
+++ b/movie.py
@@ -0,0 +1,90 @@
+"""Multiplexes video and audio inputs to encoded byte stream."""
+
+from typing import Iterable, Iterator
+
+import audio
+import frame_grabber
+import opcodes
+import video
+
+
+class Movie:
+    def __init__(self, filename: str, audio_normalization:float=1.0):
+        self.filename = filename  # type: str
+        self.audio = audio.Audio(
+            filename, normalization=audio_normalization)  # type: audio.Audio
+        # TODO: get from input file
+        self.video = video.Video()  # type: video.Video
+
+        self.cycles = 0
+        self.ticks_per_video_frame = (
+                self.audio.sample_rate /  self.video.frame_rate)
+
+        self.stream_pos = 0  # type: int
+
+        self.cycle_counter = opcodes.CycleCounter()
+
+        self.state = opcodes.State(
+            self.cycle_counter,
+            self.video.memory_map,
+            self.video.update_priority
+        )
+
+        self._last_op = opcodes.Nop()
+
+    def frames(self):
+        yield from frame_grabber.bmp2dhr_frame_grabber(self.filename)
+
+    def encode(self) -> Iterator[opcodes.Opcode]:
+        ticks = 0
+        frames = 0
+        video_seq = None
+
+        video_frames = self.frames()
+
+        for au in self.audio.audio_stream():
+            if ticks % self.ticks_per_video_frame == 0:
+                frames += 1
+                video_seq = self.video.encode_frame(next(video_frames))
+
+                print("Starting frame %d" % frames)
+                # TODO: compute similarity
+
+            ticks += 1
+            self.cycles += self.audio.cycles_per_tick
+
+            # au has range -15 .. 16 (step=1)
+            # Tick cycles are units of 2
+            tick = au * 2  # -30 .. 32 (step=2)
+            tick += 34  # 4 .. 66 (step=2)
+
+            (page, content, offsets) = next(video_seq)
+
+            yield opcodes.TICK_OPCODES[(tick, page)](content, offsets)
+
+    def _emit_bytes(self, _op):
+        # print("%04X:" % self.stream_pos)
+        for b in self.state.emit(self._last_op, _op):
+            yield b
+            self.stream_pos += 1
+        self._last_op = _op
+
+    def emit_stream(self, ops: Iterable[opcodes.Opcode]) -> Iterator[int]:
+        for op in ops:
+            # Keep track of where we are in TCP client socket buffer
+            socket_pos = self.stream_pos % 2048
+            if socket_pos >= 2044:
+                # Pad out to last byte in frame
+                nops = (2047 - socket_pos) // 2
+                # print("At position %04x, padding with %d nops" % (
+                #    socket_pos, nops))
+                for _ in range(nops):
+                    yield from self._emit_bytes(opcodes.Nop())
+                yield from self._emit_bytes(opcodes.Ack())
+                # Ack falls through to nop
+                self._last_op = opcodes.Nop()
+            yield from self._emit_bytes(op)
+
+    def done(self) -> Iterator[int]:
+        """Terminate opcode stream."""
+        yield from self._emit_bytes(opcodes.Terminate())