Resource temporary unavailable issue when retiming audio about pyav HOT 1 CLOSED

import av
from av.filter.context import FilterContext

import os
import time
import tempfile


def link_nodes(*nodes: FilterContext) -> None:
    for c, n in zip(nodes, nodes[1:]):
        c.link_to(n)


def main() -> None:
    stretched_aud_path = "out.mp3"

    audio_in_container = av.open("test.wav", mode="r", format="wav")
    audio_in_stream = audio_in_container.streams.audio[0]

    if os.path.exists(stretched_aud_path):
        os.remove(stretched_aud_path)

    audio_out_container = av.open(stretched_aud_path, mode="w", format="wav")
    output_stream = audio_out_container.add_stream(codec_name="mp3", rate=48000)

    # Setup filter graph
    filter_graph = av.filter.Graph()
    link_nodes(
        filter_graph.add_abuffer(template=audio_in_stream),
        filter_graph.add("atempo", "2.0"),
        filter_graph.add("abuffersink"),
    )
    filter_graph.configure()

    # Render audio
    for frame in audio_in_container.decode(audio=0):
        filter_graph.push(frame)
        while True:
            try:
                output_frame = filter_graph.pull()
                for packet in output_stream.encode(output_frame):
                    audio_out_container.mux(packet)
            except av.BlockingIOError:
                break

    # After pushing all frames, flush the filter graph
    for packet in output_stream.encode(None):
        audio_out_container.mux(packet)

    audio_out_container.close()
    audio_in_container.close()


if __name__ == "__main__":
    main()