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• How to live stream generative video via ffmpeg

  24 septembre 2021, par Ken

  I would like to live-stream generative audio and generative video on the web. It would be an "autonomous" setup, without anyone in front of a camera to address the audience, etc. But it needs to be "live" because it will be interactive (the audience can change parameters that will impact the stream), so it can't all come from a pre-generated file.

  


  Generative audio would come from Reaper, be sent to a virtual audio device and grabbed by ffmpeg, which would then send it to a live streaming platform (say, Youtube).

  


  I think I understand the audio part and got it mostly working.

  


  But what about the video part ? Most examples only mention either a video file or the output of a webcam.

  


  But how does one send the direct output of a program that generates video, such as Processing for example ? Can it be done with piping ? Or should one use a virtual video device ?

  


  Ideally this should work on an Raspberry-Pi but any pointer would be welcome.

  


  This question is related but it's quite old, what would be the best setup for this ?

  


• Streaming live video from ios

  12 février 2014, par John

  I have a need to stream video from the iPhone/iPad camera to a server. It looks like this will need to be done with AVCaptureSession but I don't know how to best architect this.

  I found this post :

  streaming video FROM an iPhone

  But it doesn't handle the "live" part, latency needs to be 2 or 3 seconds at most. Devices can be constrained to 4 or 4S capability if needed, and there is no requirement for HD, VGA is probably what we'll end up with. I assume any solution would use ffmpeg, I haven't found any more appropriate library.

  How is this best accomplished ?

• In FFMpeg Ubuntu “rtmp ://url live=1” not working

  13 juillet 2015, par Yuvraj Kakkar

  Trying to excute following ffmpeg command in ubuntu.

  *ffmpeg -i "rtmp://IP/live/1234 live=1" -f flv rtmp://IP/live/1234_56 *

  ffmpeg version 2.2.git Copyright (c) 2000-2014 the FFmpeg developers
  
    built on Apr  8 2014 13:15:21 with gcc 4.6 (Ubuntu/Linaro 4.6.3-1ubuntu5)
  
    configuration: --prefix=/home/encoder/ffmpeg_build --extra-cflags=-I/home/encoder/ffmpeg_build/include --extra-ldflags=-L/home/encoder/ffmpeg_build/lib --bindir=/home/encoder/bin --extra-libs=-ldl --enable-gpl --enable-libass --enable-libfdk-aac --enable-libmp3lame --enable-libopus --enable-libtheora --enable-libvorbis --enable-libvpx --enable-libx264 --enable-nonfree --enable-x11grab
  
    libavutil      52. 74.100 / 52. 74.100
  
    libavcodec     55. 58.102 / 55. 58.102
  
    libavformat    55. 36.102 / 55. 36.102
  
    libavdevice    55. 11.100 / 55. 11.100
  
    libavfilter     4.  3.100 /  4.  3.100
  
    libswscale      2.  6.100 /  2.  6.100
  
    libswresample   0. 18.100 /  0. 18.100
  
    libpostproc    52.  3.100 / 52.  3.100
  
  [rtmp @ 0x3c5a140] Detected librtmp style URL parameters, these aren't supported by the libavformat internal RTMP handler currently enabled. See the documentation for the correct way to pass parameters.
  
  ^C[flv @ 0x3c59b00] Could not find codec parameters for stream 0 (Video: none): unspecified size
  
  Consider increasing the value for the 'analyzeduration' and 'probesize' options
  
  [flv @ 0x3c59b00] Could not find codec parameters for stream 1 (Audio: none, 0 channels): unspecified sample format
  
  Consider increasing the value for the 'analyzeduration' and 'probesize' options
  
  rtmp://IP/live/1234 live=1: could not find codec parameters
  
  Received signal 2: terminating.

  I have installed avserver (Libav) earlier to ffmpeg.Kindly suggest any alternative to live=1 or provide suggstion.