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• Swapping FFMPEG input source

  21 novembre 2017, par stevendesu

  I’m using FFMPEG to stream RMTP to a server. I wish to change what I’m streaming without breaking the connection to this server.

  My current FFMPEG command looks like so :

  ffmpeg -f v4l2 -s 1280x720 -r 10 -i /dev/video0 -c:v libx264 -f flv -r 30 -pix_fmt yuv420p "rtmp://server live=true pubUser=user pubPasswd=pass playpath=stream"

  If I wanted to change from /dev/video0 to /dev/video1 then I need to stop this program and re-run the command swapping out the -i bit.

  Since FFMPEG can read from stdin as well as files, I believe it should be possible to switch the input source on the fly by either piping the output of a different program, or utilizing UNIX sockets. There may also be a solution built into FFMPEG which I’m not aware of.

  My question now is : what’s the simplest / least code / most recommended way of switching these inputs ? Is there a third-party tool that’s recommended ? Does FFMPEG have an alternate command-line parameter I’ve never heard of ? If I do use a UNIX socket of stdin, is there a recommended way to change what’s being written to them ?

  One of my concerns is that if I have FFMPEG read in from a UNIX socket and in a separate shell I have a different instance of FFMPEG writing to this UNIX socket, during the brief period when I’m switching sources the first instance of FFMPEG (which is doing the broadcasting) would die, as it couldn’t find any video data to stream.

• Merge commit ’f121dbd9f76031d7f6d56261be2f14937a19d2dd’

  10 juin 2014, par Michael Niedermayer

  Merge commit ’f121dbd9f76031d7f6d56261be2f14937a19d2dd’
  * commit ’f121dbd9f76031d7f6d56261be2f14937a19d2dd’ :
  
    mpegts : Provide an option to override the pcr period
  Conflicts :
  
  	doc/muxers.texi
  
  	libavformat/mpegtsenc.c
  Merged-by : Michael Niedermayer <michaelni@gmx.at>
  

  • [DH] doc/muxers.texi
  • [DH] libavformat/mpegtsenc.c

• Downloading a video from youtube and convert to MP4

  24 mars 2019, par Ilyes GHOMRANI

  I created a script to download a youtube video and extract an images from it for each period

  screenshotvideo

  def screenshotvideo(url, interval, id, fullduration, title, quality):
  
      interval = int(interval)
  
      parsed_t = isodate.parse_duration(fullduration)
  
      durationseconds=parsed_t.total_seconds()
  
      iterat=int(durationseconds/int(interval))
  
      for i in range(0, iterat):
  
          print(str(id))
  
          print(str(i))
  
          print(str(i*interval))
  
          part(url, time.strftime('%H:%M:%S', time.gmtime(int(i*interval))), "00:00:01", title+"-"+str(id), quality)

  part

  def part(url, starttime, duration, name, quality):
  
      f = os.popen("ffmpeg $(youtube-dl -f "+quality+" -g '"+url+"' | sed 's/.*/-ss "+starttime+" -i &/') -t "+duration+" -c copy "+name+".mp4")
  
      now = f.read()
  
      print(now)
  
      f = os.popen("ffmpeg -i "+name+".mp4 -ss 00:00:00 -vframes 1 "+name+".jpg")
  
      now = f.read()
  
      print(now)
  
      f = os.popen("rm -rf "+name+".mp4")
  
      now = f.read()
  
      print(now)

  so i got the folowing error in the first ffmpeg command

  [mp4 @ 0x55d537f64240] Could not find tag for codec vp8 in stream #0, codec not currently supported in container.

  Could not write header for output file #0 (incorrect codec parameters ?) : Invalid argument