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import av
av.logging.set_level(av.logging.VERBOSE)
input_file = av.open("input.wav")
output_file = av.open("output.wav", mode="w")
input_stream = input_file.streams.audio[0]
output_stream = output_file.add_stream("pcm_s16le", rate=input_stream.rate)
graph = av.filter.Graph()
graph.link_nodes(
graph.add_abuffer(template=input_stream),
graph.add("atempo", "2.0"),
graph.add("abuffersink"),
).configure()
for frame in input_file.decode(input_stream):
graph.push(frame)
while True:
try:
for packet in output_stream.encode(graph.pull()):
output_file.mux(packet)
except (av.BlockingIOError, av.EOFError):
break
# Flush the stream
for packet in output_stream.encode(None):
output_file.mux(packet)
input_file.close()
output_file.close()
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