pyav_remuxing.py

import io
import av

input_container = av.open("rtsp://CAMERA_IP_ADDRESS:554/Streaming/Channels/101", "r")
input_stream = input_container.streams.video[0]

output_buffer = io.BytesIO()
output_container = av.open(output_buffer, 'w', format="mp4", options={"strict":"-1", "movflags":"empty_moov+omit_tfhd_offset+frag_keyframe+default_base_moof"})
output_stream = output_container.add_stream(template=input_stream)

first_packet = True
for packet in input_container.demux(input_stream):
    if first_packet:
        packet.dts = 0
        packet.pts = 0
        first_packet = False
    packet.stream = output_stream
    output_container.mux_one(packet)
    result = output_buffer.getvalue()
    if result:
        print("YES", packet.is_keyframe)
        output_buffer.truncate(0)
        output_buffer.seek(0)
    else:
        print("NO", packet.is_keyframe)