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• FFmpeg to connect to RTSP in Python, but sometimes the video stream freezes, and FFmpeg throws an error

  23 décembre 2024, par Jin Hc
  

  • Here is part of my code. I use the ffmpeg-python library in Python to receive the RTSP stream and perform subsequent processing.

  


  


      def __init__(self, parent: QWidget = None):
        super(captureVideo_Thread, self).__init__()
        self.ffmpeg_args = {
            "rtsp_transport": "tcp",
            "fflags": "+genpts+discardcorrupt+autobsf+fastseek",
            "flags": "low_delay",
            "err_detect": "ignore_err",
            "reorder_queue_size": 10000,
            "vsync": 2,
            "probesize": 10 * 1000000,
            "analyzeduration": 10 * 1000000,
            "threads": "auto",
            "correct_ts_overflow": "1",
        }

        self.parent: Video_Widgets = parent
        self.running_FLAG = True
        self.mutex = QMutex()
        self.process = None

    def run(self) -> None:
        try:
            probe = func_timeout(2, ffmpeg.probe, (self.parent.video_source,))
        except FunctionTimedOut:
            self.captureVideoEnd_signal.emit()
            return
        except ffmpeg.Error as e:
            self.captureVideoEnd_signal.emit()
            return
        cap_info = next(x for x in probe["streams"] if x["codec_type"] == "video")
        video_width = cap_info["width"]
        video_height = cap_info["height"]
        config.video_width = video_width
        config.video_height = video_height
        up, down = str(cap_info["r_frame_rate"]).split("/")
        config.video_fps = round(eval(up) / eval(down), 2)
        self.process = (
            ffmpeg.input(self.parent.video_source, **self.ffmpeg_args)
            .output(
                "pipe:",
                format="rawvideo",
                pix_fmt="rgb24",
            )
            .overwrite_output()
            .run_async(pipe_stdout=True)
        )

        while True:
            if not config.is_openVideo:
                config.is_openVideo = True
            with config.locked(self.mutex):
                if not self.running_FLAG:
                    break

            in_bytes = self.process.stdout.read(video_width * video_height * 3)
            expected_size = video_width * video_height * 3
            if not in_bytes or len(in_bytes) != expected_size:
                continue

            in_frame = np.frombuffer(in_bytes, np.uint8).reshape([video_height, video_width, 3])


  


  

  • There are two phenomena that occur, and these do not happen at fixed times. The first phenomenon is that FFmpeg throws the following error, but the video continues playing.

  


  


  # client
[vist#0:0/h264 @ 000002419fad8e40] [dec:h264 @ 00000241a01046c0] corrupt decoded frame
frame=87565 fps= 50 q=-0.0 size=336245760KiB time=00:29:11.20 bitrate=1572927.9kbits/s speed=   1x  
[h264 @ 00000241a0104a00] Invalid level prefix
[h264 @ 00000241a0104a00] error while decoding MB 25 63
[vist#0:0/h264 @ 000002419fad8e40] [dec:h264 @ 00000241a01046c0] corrupt decoded frame
frame=87593 fps= 50 q=-0.0 size=336353280KiB time=00:29:11.75 bitrate=1572938.5kbits/s speed=   1x  
[h264 @ 00000241a0104a00] Invalid level prefix
[h264 @ 00000241a0104a00] error while decoding MB 24 63
[vist#0:0/h264 @ 000002419fad8e40] [dec:h264 @ 00000241a01046c0] corrupt decoded frame


  


  # server
No errors.


  


  

  • The second phenomenon is that the receiver on my side will freeze completely, and the speed displayed by FFmpeg will gradually decrease (the trigger time for this behavior is random, sometimes after 5 minutes, sometimes after 20 minutes). Additionally, the sender will display a large number of errors.

  


  


  # client
frame=21131 fps= 48 q=-0.0 size=81139200KiB time=00:07:10.97 bitrate=1542290.7kbits/s speed=0.984x


  


  # server
[WARN  rtsp_lib/rtsp_demo.c:1966:rtsp_sever_tx_video] client 192.168.0.102 will lost video packet
[WARN  rtsp_lib/rtsp_demo.c:1966:rtsp_sever_tx_video] client 192.168.0.102 will lost video packet
[WARN  rtsp_lib/rtsp_demo.c:1966:rtsp_sever_tx_video] client 192.168.0.102 will lost video packet
[WARN  rtsp_lib/rtsp_demo.c:1966:rtsp_sever_tx_video] client 192.168.0.102 will lost video packet
[WARN  rtsp_lib/rtsp_demo.c:1966:rtsp_sever_tx_video] client 192.168.0.102 will lost video packet
[DEBUG rtsp_lib/rtsp_msg.c:865:rtsp_msg_parse_from_array]
RTSP/1.0 501 Not Implemented


  


  


  • I am sure the issue is not with the stream source, because there are no problems when using VLC or other software.

    


  


  • I think the issue might be with my FFmpeg settings.???

    


  


  • I found that the average bitrate of VLC is 19000kb/s, but the FFmpeg in my code shows 1500000kb/s. Why is this happening ? Is there something wrong with my settings ?

    


  


  


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