How do I set the value of slices?

[kuncoding]

I need to use pyav library to encode h264, and I need to set the slices value, which does not work after I set the value in options. How can I set it to work

[WyattBlue]

Something like this?

import av

av.logging.set_level(av.logging.VERBOSE)


def reencode_with_slices(
    input_filename: str, output_filename: str, slices: int
) -> None:
    input_container = av.open(input_filename)
    output_container = av.open(output_filename, mode="w")

    video_stream = output_container.add_stream("h264", rate=30)
    video_stream.codec_context.options = {"slices": f"{slices}"}

    input_video_stream = input_container.streams.video[0]
    video_stream.width = input_video_stream.width
    video_stream.height = input_video_stream.height
    video_stream.pix_fmt = "yuv420p"

    for frame in input_container.decode(input_video_stream):
        for packet in video_stream.encode(frame):
            output_container.mux(packet)

    # Flush the encoder
    for packet in video_stream.encode():
        output_container.mux(packet)

    input_container.close()
    output_container.close()


if __name__ == "__main__":
    input_filename = "example.mp4"
    output_filename = "output.mp4"
    slices = 4  # Set your desired number of slices here

    reencode_with_slices(input_filename, output_filename, slices)

[kuncoding]

I tested this code, set slices to 1, analyzed the stream with the tool, and found that slices did not work

[diogommartins]

Which tool?

[kuncoding]

H264BSAnalyzer tool