301 lines
11 KiB
Python
301 lines
11 KiB
Python
"""Provides the worker thread needed for processing streams."""
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from collections import deque
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import io
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import logging
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import time
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import av
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from .const import (
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MAX_MISSING_DTS,
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MAX_TIMESTAMP_GAP,
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MIN_SEGMENT_DURATION,
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PACKETS_TO_WAIT_FOR_AUDIO,
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STREAM_RESTART_INCREMENT,
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STREAM_RESTART_RESET_TIME,
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STREAM_TIMEOUT,
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)
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from .core import Segment, StreamBuffer
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_LOGGER = logging.getLogger(__name__)
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def create_stream_buffer(stream_output, video_stream, audio_stream, sequence):
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"""Create a new StreamBuffer."""
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segment = io.BytesIO()
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container_options = (
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stream_output.container_options(sequence)
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if stream_output.container_options
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else {}
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)
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output = av.open(
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segment,
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mode="w",
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format=stream_output.format,
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container_options={
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"video_track_timescale": str(int(1 / video_stream.time_base)),
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**container_options,
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},
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)
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vstream = output.add_stream(template=video_stream)
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# Check if audio is requested
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astream = None
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if audio_stream and audio_stream.name in stream_output.audio_codecs:
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astream = output.add_stream(template=audio_stream)
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return StreamBuffer(segment, output, vstream, astream)
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def stream_worker(hass, stream, quit_event):
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"""Handle consuming streams and restart keepalive streams."""
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wait_timeout = 0
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while not quit_event.wait(timeout=wait_timeout):
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start_time = time.time()
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try:
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_stream_worker_internal(hass, stream, quit_event)
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except av.error.FFmpegError: # pylint: disable=c-extension-no-member
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_LOGGER.exception("Stream connection failed: %s", stream.source)
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if not stream.keepalive or quit_event.is_set():
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break
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# To avoid excessive restarts, wait before restarting
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# As the required recovery time may be different for different setups, start
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# with trying a short wait_timeout and increase it on each reconnection attempt.
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# Reset the wait_timeout after the worker has been up for several minutes
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if time.time() - start_time > STREAM_RESTART_RESET_TIME:
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wait_timeout = 0
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wait_timeout += STREAM_RESTART_INCREMENT
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_LOGGER.debug(
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"Restarting stream worker in %d seconds: %s",
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wait_timeout,
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stream.source,
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)
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def _stream_worker_internal(hass, stream, quit_event):
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"""Handle consuming streams."""
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try:
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container = av.open(
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stream.source, options=stream.options, timeout=STREAM_TIMEOUT
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)
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except av.AVError:
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_LOGGER.error("Error opening stream %s", stream.source)
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return
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try:
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video_stream = container.streams.video[0]
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except (KeyError, IndexError):
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_LOGGER.error("Stream has no video")
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container.close()
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return
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try:
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audio_stream = container.streams.audio[0]
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except (KeyError, IndexError):
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audio_stream = None
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# These formats need aac_adtstoasc bitstream filter, but auto_bsf not
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# compatible with empty_moov and manual bitstream filters not in PyAV
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if container.format.name in {"hls", "mpegts"}:
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audio_stream = None
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# Some audio streams do not have a profile and throw errors when remuxing
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if audio_stream and audio_stream.profile is None:
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audio_stream = None
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# Iterator for demuxing
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container_packets = None
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# The decoder timestamps of the latest packet in each stream we processed
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last_dts = {video_stream: float("-inf"), audio_stream: float("-inf")}
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# Keep track of consecutive packets without a dts to detect end of stream.
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missing_dts = 0
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# Holds the buffers for each stream provider
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outputs = None
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# Keep track of the number of segments we've processed
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sequence = 0
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# The video pts at the beginning of the segment
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segment_start_pts = None
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# Because of problems 1 and 2 below, we need to store the first few packets and replay them
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initial_packets = deque()
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# Have to work around two problems with RTSP feeds in ffmpeg
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# 1 - first frame has bad pts/dts https://trac.ffmpeg.org/ticket/5018
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# 2 - seeking can be problematic https://trac.ffmpeg.org/ticket/7815
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def peek_first_pts():
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"""Initialize by peeking into the first few packets of the stream.
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Deal with problem #1 above (bad first packet pts/dts) by recalculating using pts/dts from second packet.
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Also load the first video keyframe pts into segment_start_pts and check if the audio stream really exists.
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"""
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nonlocal segment_start_pts, audio_stream, container_packets
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missing_dts = 0
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found_audio = False
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try:
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container_packets = container.demux((video_stream, audio_stream))
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first_packet = None
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# Get to first video keyframe
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while first_packet is None:
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packet = next(container_packets)
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if (
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packet.dts is None
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): # Allow MAX_MISSING_DTS packets with no dts, raise error on the next one
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if missing_dts >= MAX_MISSING_DTS:
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raise StopIteration(
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f"Invalid data - got {MAX_MISSING_DTS+1} packets with missing DTS while initializing"
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)
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missing_dts += 1
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continue
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if packet.stream == audio_stream:
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found_audio = True
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elif packet.is_keyframe: # video_keyframe
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first_packet = packet
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initial_packets.append(packet)
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# Get first_pts from subsequent frame to first keyframe
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while segment_start_pts is None or (
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audio_stream
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and not found_audio
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and len(initial_packets) < PACKETS_TO_WAIT_FOR_AUDIO
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):
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packet = next(container_packets)
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if (
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packet.dts is None
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): # Allow MAX_MISSING_DTS packet with no dts, raise error on the next one
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if missing_dts >= MAX_MISSING_DTS:
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raise StopIteration(
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f"Invalid data - got {MAX_MISSING_DTS+1} packets with missing DTS while initializing"
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)
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missing_dts += 1
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continue
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if packet.stream == audio_stream:
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found_audio = True
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elif (
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segment_start_pts is None
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): # This is the second video frame to calculate first_pts from
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segment_start_pts = packet.dts - packet.duration
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first_packet.pts = segment_start_pts
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first_packet.dts = segment_start_pts
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initial_packets.append(packet)
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if audio_stream and not found_audio:
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_LOGGER.warning(
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"Audio stream not found"
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) # Some streams declare an audio stream and never send any packets
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audio_stream = None
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except (av.AVError, StopIteration) as ex:
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_LOGGER.error(
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"Error demuxing stream while finding first packet: %s", str(ex)
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)
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finalize_stream()
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return False
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return True
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def initialize_segment(video_pts):
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"""Reset some variables and initialize outputs for each segment."""
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nonlocal outputs, sequence, segment_start_pts
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# Clear outputs and increment sequence
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outputs = {}
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sequence += 1
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segment_start_pts = video_pts
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for stream_output in stream.outputs.values():
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if video_stream.name not in stream_output.video_codecs:
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continue
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buffer = create_stream_buffer(
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stream_output, video_stream, audio_stream, sequence
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)
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outputs[stream_output.name] = (
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buffer,
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{video_stream: buffer.vstream, audio_stream: buffer.astream},
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)
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def mux_video_packet(packet):
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# mux packets to each buffer
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for buffer, output_streams in outputs.values():
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# Assign the packet to the new stream & mux
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packet.stream = output_streams[video_stream]
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buffer.output.mux(packet)
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def mux_audio_packet(packet):
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# almost the same as muxing video but add extra check
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for buffer, output_streams in outputs.values():
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# Assign the packet to the new stream & mux
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if output_streams.get(audio_stream):
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packet.stream = output_streams[audio_stream]
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buffer.output.mux(packet)
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def finalize_stream():
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if not stream.keepalive:
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# End of stream, clear listeners and stop thread
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for fmt in stream.outputs:
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stream.outputs[fmt].put(None)
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if not peek_first_pts():
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container.close()
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return
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initialize_segment(segment_start_pts)
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while not quit_event.is_set():
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try:
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if len(initial_packets) > 0:
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packet = initial_packets.popleft()
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else:
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packet = next(container_packets)
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if packet.dts is None:
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# Allow MAX_MISSING_DTS consecutive packets without dts. Terminate the stream on the next one.
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if missing_dts >= MAX_MISSING_DTS:
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raise StopIteration(
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f"No dts in {MAX_MISSING_DTS+1} consecutive packets"
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)
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missing_dts += 1
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continue
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missing_dts = 0
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except (av.AVError, StopIteration) as ex:
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_LOGGER.error("Error demuxing stream: %s", str(ex))
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finalize_stream()
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break
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# Discard packet if dts is not monotonic
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if packet.dts <= last_dts[packet.stream]:
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if (
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packet.time_base * (last_dts[packet.stream] - packet.dts)
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> MAX_TIMESTAMP_GAP
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):
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_LOGGER.warning(
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"Timestamp overflow detected: last dts %s, dts = %s, resetting stream",
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last_dts[packet.stream],
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packet.dts,
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)
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finalize_stream()
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break
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continue
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# Check for end of segment
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if packet.stream == video_stream and packet.is_keyframe:
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segment_duration = (packet.pts - segment_start_pts) * packet.time_base
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if segment_duration >= MIN_SEGMENT_DURATION:
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# Save segment to outputs
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for fmt, (buffer, _) in outputs.items():
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buffer.output.close()
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if stream.outputs.get(fmt):
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stream.outputs[fmt].put(
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Segment(
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sequence,
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buffer.segment,
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segment_duration,
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),
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)
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# Reinitialize
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initialize_segment(packet.pts)
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# Update last_dts processed
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last_dts[packet.stream] = packet.dts
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# mux packets
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if packet.stream == video_stream:
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mux_video_packet(packet) # mutates packet timestamps
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else:
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mux_audio_packet(packet) # mutates packet timestamps
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# Close stream
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for buffer, _ in outputs.values():
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buffer.output.close()
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container.close()
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