Recherche avancée

Sur d’autres sites (5023)

• Starting and stopping an ffmpeg pipeline in python

  25 septembre 2014, par user3147697

  I’m trying to start and stop an ffmpeg pipeline in my Python script. I can get it to start the pipeline on command, using a subprocess, but it ties up the script, so that it no longer receives commands. What do I need to change to keep this from happening ?

  I’m using :

      pipeline= "ffmpeg -f video4linux2 -video_size 640x480 -framerate 15 -input_format yuyv422 -i /dev/video7 -f alsa  -i hw:0,0 -map 0:0 -map 1:0  -b:v 120k -bufsize 120k -vcodec libx264 -preset ultrafast  -acodec aac -strict -2  -f flv -metadata streamName=myStream tcp://192.168.1.20:6666 "
  
  
  
      p = subprocess.Popen(pipeline, shell=True,
  
                           stdout=subprocess.PIPE, stderr=subprocess.STDOUT)
  
      output = p.communicate()[0]

• How to use multi-input filters with ffmpeg-python

  6 août 2022, par Benjamin Barrois

  I want to mimic the following ffmpeg command with ffmpeg-python

  



  ffmpeg -y -i in.mp4 -t 30 -filter_complex "fps=10,scale=-1:-1:flags=lanczos[x];[0:v]palettegen[y];[x][y]paletteuse" out.gif

  



  So far, this is what I've got :

  



  in_stream = ffmpeg.input(src, ss=start_time, t=(stop_time-start_time))
scale_input = in_stream
if fps >= 1:
    stream = ffmpeg.filter(in_stream['v'], 'fps', fps)
    scale_input = stream

stream = ffmpeg.filter(scale_input, 'scale', output_width, output_height, 'lanczos')

palette = ffmpeg.filter(in_stream['v'], 'palettegen')
#stream = ffmpeg.filter(stream, palette, 'paletteuse') ???
stream.output(dst).run()


  



  I checked, the palette generates well if I output it as a png. However, I can't find how to use it through the multi-input command paletteuse, as filters only take one stream as an input in ffmpeg-python. I tried concatenating them with ffmpeg.concat() which is the only method I found to make one stream from two but I think it is non-sense (and it doesn't work anyway).

  



  Any idea ?

  


• RTMP stream monitoring in python

  18 mars 2015, par lasgun

  I don’t have experience with python, but I found this online :
  https://gist.github.com/sinkers/d647a80fdb180b4cc3a6
  Assuming it works with the current version of ffmpeg (ffprobe), I tried to just modify the code a bit, so it doesn’t log in to Amazon SNS to send a message. Just simply opening an audio file when the stream goes down, with the following command (I found it on this site) would do just fine :

  os.system("start /sound/xyz.mp3")

  I tried to do this-and-that, but I can’t seem to succeed. I have 3.x installed.

  I know it’s probably silly, but do I need to enter the relative, or absolute file locations ? For ffprobe and the sound file, is it C :\... or what’s the correct format and path ?

  Any help to solve this would be greatly appreciated.