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• Python buffered IO ending early streaming with multiple pipes

  5 octobre 2022, par Malibu

  I'm trying to make a continuous livestream of videos downloaded via yt-dlp. I need to port this (working) bash command into Python.

  


  (
    youtube-dl -v --buffer-size 16k https://youtube.com/watch?v=QiInzFHIDp4 -o - | ffmpeg -i - -f mpegts -c copy - ;
    youtube-dl -v --buffer-size 16k https://youtube.com/watch?v=QiInzFHIDp4 -o - | ffmpeg -i - -f mpegts -c copy - ;
) | ffmpeg -re -i - -c:v libx264 -f flv rtmp://127.0.0.1/live/H1P_x5WPF


  


  My Python attempt is cutting off the last 2 seconds of each video. My suspicion is that although the first pipe, yt-dlp, has an empty stdout, there is still data travelling between the second and third pipe. I haven't been able to figure out a way to properly handle the data between those two pipes at the end of the video.

  


  from subprocess import Popen, PIPE, DEVNULL

COPY_BUFSIZE = 65424

playlist = [
    {
        # 15 second video
        "url": "https://youtube.com/watch?v=QiInzFHIDp4"
    },
    {
        # 15 second video
        "url": "https://youtube.com/watch?v=QiInzFHIDp4"
    },
    {
        # 15 second video
        "url": "https://youtube.com/watch?v=QiInzFHIDp4"
    },
]

if __name__ == "__main__":
    stream_cmd = [
        "ffmpeg", "-loglevel", "error",
        "-hide_banner", "-re", "-i", "-",
        "-c:v", "libx264",
        "-f", "flv",
        "-b:v", "3000k", "-minrate", "3000k",
        "-maxrate", "3000k", "-bufsize", "3000k",
        "-r", "25", "-pix_fmt", "yuv420p",
        "rtmp://127.0.0.1/live/H1P_x5WPF"
    ]
    print(f'Stream command:\n"{" ".join(stream_cmd)}"')

    encoder_cmd = [
        "ffmpeg", "-re", "-i", "-", "-f", "mpegts",
        "-c", "copy", "-"
    ]
    print(f'Encoder command:\n"{" ".join(encoder_cmd)}"')

    stream_p = Popen(stream_cmd, stdin=PIPE, stderr=DEVNULL)

    for video in playlist:
        yt_dlp_cmd = [
            "yt-dlp", "-q",
            video["url"],
            "-o", "-"
        ]

        print("Now playing: " + video["url"])

        with Popen(yt_dlp_cmd, stdout=PIPE) as yt_dlp_p:
            with Popen(encoder_cmd, stdin=PIPE, stdout=PIPE, stderr=DEVNULL) as encoder_p:
                while True:
                    yt_dlp_buf = yt_dlp_p.stdout.read(COPY_BUFSIZE)
                    print("READ: yt_dlp")
                    if not yt_dlp_buf:
                        print("yt-dlp buffer empty")
                        # Handle any data in 2nd/3rd pipes before breaking?
                        break

                    written = encoder_p.stdin.write(yt_dlp_buf)
                    print("WRITE: encoder. Bytes: " + str(written))

                    encoder_buf = encoder_p.stdout.read(COPY_BUFSIZE)
                    # if not encoder_buf:
                    #     print("encoder_buf empty")
                    #     break
                    print("READ: encoder")

                    stream_bytes_written = stream_p.stdin.write(encoder_buf)
                    print("WRITE: stream, Bytes: " + str(stream_bytes_written))


  


  Running Python 3.6.9 on MacOS.

  


• lavc/libaomenc : Add a maximum constraint of 64 encoder threads.

  27 novembre 2018, par Jun Zhao

  lavc/libaomenc : Add a maximum constraint of 64 encoder threads.
  fixed the error in Intel(R) Xeon(R) Gold 6152 CPU like :
  
  [libaom-av1 @ 0x469f340] Failed to initialize encoder : Invalid parameter
  
  [libaom-av1 @ 0x469f340]   Additional information : g_threads out of range [..MAX_NUM_THREADS]
  Signed-off-by : Jun Zhao <mypopydev@gmail.com>
  
  Signed-off-by : James Almer <jamrial@gmail.com>
  

  • [DH] libavcodec/libaomenc.c

• C# streaming drone video

  12 mai 2017, par jasonmacintosh

  I am currently a student and I have a project which require using the drone and the livestream from its camera

  I managed to find a control program http://www.winardrone.com which can control my ar drone 2.0 , but the problem is that the program doesn’t support my drone’s camera live stream method(TCP)due to the fact that the program is more compatible to the ar drone 1.0(older version drone) which uses(UDP)

  so I have encountered a problem of putting the video stream into my program
  ,there are a really simple solution of using ffmpeg player with cmd command "ffplay tcp ://192.168.1.1:5555", but it does mean that my program have to run in multiple windows and I won’t be able to save my frames with my program to do analyzation

  so could anyone tell me how to Stream my TCP video in my visual studio C# program and capture frames at the same time ?
  just like the program in this video
  https://www.youtube.com/watch?v=4V5B-DPWdOQ

  I wish to get the video image in a program instead of opening a new window

  And sorry for my bad grammar, thanks for your reply