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• Switching YouTube Live Stream Source FFMPEG

  26 juillet 2023, par AsadSMalik

  I'm experimenting with a live stream on YouTube where I can switch the source of it based on some external inputs. So for example, I have two webcams and by default the live stream shows the stream from webcam 1. Then based on some input, it needs to switch to broadcasting the stream from webcam 2. This is what I have so far but it disrupts the stream with the buffering loading circle before it switches to the second one instead of being like an instant switch.

  


  This is the code I'm using to create the ffmpeg command which runs to stream to YouTube.

  


  def create_ffmpeg_cmd(cam_uri):
    return ['ffmpeg',
            '-i', cam_uri,
            '-c:v', 'libx264',
            '-f', 'flv',
            f"{YOUTUBE_STREAM_URI}/{YOUTUBE_STREAM_KEY}"
            ]


  


  This is the code block which runs to switch streams when next_stream_uri is updated.

  


      def run(self, *args, **kwargs):
        command = create_ffmpeg_cmd(DEFAULT_CAM_URI)
        p = sp.Popen(command, stdin=sp.PIPE)
        stream_uri = self.next_stream_uri
        while True:
            if self.next_stream_uri != stream_uri:
                print(f"Changing stream from {stream_uri} to {self.next_stream_uri} ...")
                stream_uri = self.next_stream_uri
                cmd = create_ffmpeg_cmd(stream_uri)
                new_p = sp.Popen(cmd, stdin=sp.PIPE)
                time.sleep(1)
                p.terminate()
                p = new_p


  


  I put in the time.sleep(1) before terminating the first one to see if that works but I still see some buffering happening. Not sure if it's even possible to achieve a seamless switch but wanted to see if there are some better ways of doing it.

  


• Edit random videos from youtube using ffmpeg

  15 janvier 2015, par Jacques le lezard

  I’m trying to edit several videos of different size, format, ratio, etc (random videos from youtube)

  As to edit these I use : ffmpeg -f concat -i videos.txt -s 1280x720 -c copy output/edited_video.mp4 All videos are listed in videos.txt

  But it doesn’t work like that, it seems ffmpeg need homogeneous videos to edit the finale video. For now the first video is displayed fine but the following are glitched...

  How can I homogenize any video to the same size, ratio, format, codec, ...?

  (For now I use : ffmpeg -i input/video.mp4 -r 30 -vcodec mpeg4 -s 1280x720 -c copy temp/video.mp4 but it seems it’s not enough.)

• ffmpeg youtube live stream vb.net

  17 mai 2020, par Sharath Nandakumar

  i want to stream desktop to youtube live using ffmpeg. I am programming in visual basic 2019. i have downloaded copied ffmpeg to C folder from ffmpeg.org. the code i used was

  



  Public Class Form1
Private Sub Form1_Load(sender As Object, e As EventArgs) Handles Me.Load
    Dim psi As ProcessStartInfo = New ProcessStartInfo("C:/ffmpeg.exe")
    Dim proc As Process = Process.Start(psi)
    psi.UseShellExecute = False
    psi.CreateNoWindow = True
    psi.Arguments = "ffmpeg -loglevel debug -threads:v 2 -threads:a 8 -filter_threads 2 -thread_queue_size 512  -f dshow -i video="desktop" -f dshow -i audio="speakers (2- Realtek High Definition Audio)" -pix_fmt yuv420p -c:v libx264 -qp:v 19 -profile:v high -rc:v cbr_ld_hq -level:v 4.2 -r:v 60 -g:v 120 -bf:v 3 -refs:v 16 -f flv rtmp://youtube_stream_url/stream_key"
    proc = Process.Start(psi)
End Sub


  



  End Class

  



  I am not getting any results. Please help me. Thanks in advance