How can I get the sidedata of type SEI_UNREGISTERED and convert it to a byte array or string object?

[david6096]

How can I get the sidedata of type SEI_UNREGISTERED and convert it to a byte array or string object?

[david6096]

I'v gotten it!

data = frame.side_data.get(av.sidedata.sidedata.Type.SEI_UNREGISTERED)
if data is not None:
   buf = bytes(data)
   s1 = buf[16:].decode("utf-8")
   print(s1)

[phdh4]

Thanks for your post, it helped me solve the same problem : ).

[bradmartin333]

thank you for the info - it was helpful in figuring out how to parse the S12M_TIMECODE type

import sys
import av
import av.sidedata
import av.sidedata.sidedata


def decode_smpte_timecode(byte_data, fps=60.0):
    field_multiplier = 1
    if fps > 90.0:
        field_multiplier = 4
    elif fps > 60.0:
        field_multiplier = 3
    elif fps > 30.0:
        field_multiplier = 2

    bits_data = bin(int.from_bytes(byte_data, byteorder="big"))[27:59]

    def bin_to_int(start):
        return int("".join(map(str, bits_data[start : start + 4 - start % 4])), 2)

    hours_tens = bin_to_int(0)
    hours_ones = bin_to_int(4)
    minutes_tens = bin_to_int(8)
    minutes_ones = bin_to_int(12)
    frames_field = int(bits_data[16])
    seconds_tens = bin_to_int(17)
    seconds_ones = bin_to_int(20)
    frames_tens = bin_to_int(24)
    frames_ones = bin_to_int(28)

    hours = (hours_tens * 10) + hours_ones
    minutes = (minutes_tens * 10) + minutes_ones
    seconds = (seconds_tens * 10) + seconds_ones
    frames = ((frames_tens * 10) + frames_ones) * field_multiplier + frames_field

    return f"{hours:02}:{minutes:02}:{seconds:02}:{frames:02}"


def frame_iter(video):
    streams = video.streams.video
    for packet in video.demux(streams):
        for frame in packet.decode():
            yield frame


frames = frame_iter(av.open(sys.argv[1]))
for frame in frames:
    data = frame.side_data.get(av.sidedata.sidedata.Type.S12M_TIMECODE)
    if data is not None:
        print(decode_smpte_timecode(bytes(data)))