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• ffmpeg-python : combine live video/audio streams into one file

  3 avril 2021, par Greendrake

  I am using python-dvr to pull raw video/audio streams from IP cameras. It parses the binary data into chunks of video and audio and writes them into separate files like this :

  


  with open("file.video", "wb") as v, open("file.audio", "wb") as a:
    def receiver(frame, meta, user):
        if 'frame' in meta:
            v.write(frame)
        if 'type' in meta and meta["type"] == "g711a":
            a.write(frame)
    
    cam.start_monitor(receiver)


  


  I could then use ffmpeg binary to combine the two files into one. But I want the script to do it straight away continuously (splitting the combined stream into say 10-min clips but that would be a separate question).

  


  It looks like ffmpeg-python.output could do it. But, with virtually no experience in Python I can't immediately get my head around it. The syntax goes :

  


  ffmpeg.output(stream1[, stream2, stream3…], filename, **ffmpeg_args)


  


  How do I use that in the code above ? I do not have "streams" as such there. Instead, the receiver function is called in a loop with frames/chunks of binary data, which could be video or audio. How do I "pipe" them into the ffmpeg.output function ?

  


• ffmpeg - using bash variable for multiple inputs. Problem with spaces in filenames [duplicate]

  30 août 2019, par drake7

  This question already has an answer here :

  • Why does shell ignore quotes in arguments passed to it through variables ? [duplicate]
    
    3 answers
    

  I want to concatenate files with different codecs. My code only works for filenames without spaces.

  I have a fair amount of experience with using ffmpeg with bash.
  However everything I’ve tried to solve the problem did’t work :

  Let’s say my videos are "01 video.mov" and "02 video.mp4".

  not quoting $i : (This is the current status quo of my script.)

  ffmpegInput="$ffmpegInput -i ${i}"

  results in :

  01: No such file or directory

  quoting $i :

  ffmpegInput="$ffmpegInput -i \"${i}\""

  results in :

  "01: No such file or directory

  This code only works for filenames without spaces :

  ffmpegInput=""
  
  
  
  for i in *
  
  do
  
  
  
  ffmpegInput="$ffmpegInput -i ${i}"
  
  
  
  ffmpeg ${ffmpegInput} -filter_complex "[0:v:0][0:a:0][1:v:0][1:a:0]concat=n=2:v=1:a=1[outv][outa]" -map "[outv]" -map "[outa]" ../output.mkv
  
  
  
  done

  I did’t expect to encounter problems with quoting.

  But the fact that I store all inputs in a variable or an array makes it difficult.

  Althought the variable stores the string :

  -i "01 video.mov" -i "02 video.mp4"

  ffmpeg doesn’t seem to see the first " as a valid quote.
  Since ffmpeg throws the error

  "01: No such file or directory

  it seems as if the " is actually there.

• Live jpeg sequence image to RTMP fps drop

  6 avril 2021, par m0j1

  I want to encode a sequence of jpg images (captured from my camera in unity) to h264 codec live stream video. I'm using the following command in ffmpeg :

  


  -f image2pipe -vcodec mjpeg -r 25 -i  udp://127.0.0.1:6000  -r 25 -preset slow -vcodec libx264 -tune zerolatency -b:v 800k -maxrate 800k -bufsize 400k  -f mpegts udp://127.0.0.1:5701


  


  On the other side, I playback this live stream using ffplay (ffplay -fflags nobuffer -flags low_delay -framedrop udp ://192.168.189.112:5701) and everything seems to be fine.
  
After that, I want to use a media server to restream this to other clients so I chose node media server and with the following ffmpeg comment I stream my image sequence to my media server :

  


  -f image2pipe -vcodec mjpeg -r 25 -i  udp://127.0.0.1:6000  -r 25 -preset slow -vcodec libx264 -tune zerolatency -b:v 800k -maxrate 800k -bufsize 400k  -f flv rtmp://192.168.189.112/live/STREAM_NAME


  


  But when I use ffplay to playback this live stream using the following command I get a choppy stream that looks like it is in 5fps :

  


  ffplay -fflags nobuffer -flags low_delay -framedroprtmp://192.168.189.112/live/STREAM_NAME

 


  


  I also tried to first record my live stream using node media server and then play it to see if I had received the data right and surprisingly the recorded video is perfect.

  
I wanted to ask if someone has any tips or experience about this.