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• Imageio unable to read webcam at correct framerate

  28 mai 2019, par Jason Nick Porter

  I’m trying to read frames from a webcam and analyze them in realtime, but since my function AnalyzeFrame() is faster than the framerate, it ends up pulling the same frame 1-4 times in a row, messing up my data. Here’s basically what I’m running.

  import imageio
  
  
  
  cam = imageio.get_reader('<video0>', fps=30)
  
  
  
  while not cam.closed:
  
      print(AnalyzeFrame(cam.get_next_data()))
  
  </video0>

  A few notes : My webcam should be able to handle 30fps, but I’m averaging 12-14 fps. I’ve timed each individual process and there’s very little regularity to the framerate. Some frames only get analyzed once, because they’re in the buffer for 20 or so milliseconds. Others get analyzed 4 times over a span of 100+ ms. Is there something in my code that’s causing this framerate problem ?

• How do I convert this ffmpeg command to be used in ffmpy ?

  8 janvier 2017, par user7389159

  I have a gif that I am taking apart frame by frame in order to write text onto it. I used ffmpeg to put the frames (saved as individual .png files) back together and it worked nicely. This is the code I used :

  ffmpeg -f image2 -i newimg%d.png out.gif

  But now I want to use the python wrapper ffmpy. Following the docs, I tried a variety of things but I keep getting syntax errors.

  Here is one instance of my efforts :

  ff = ffmpy(FFmpeg(inputs = {ffmpeg -f image2 -i "newimg%d.png"}, outputs = {"gif_with_text.gif"}))
  
  ff.run()

  In this attempt, the syntax error points to the "2" in image2. Could someone help me out ? Note - I’m new to python, let alone ffmpeg and ffmpy.

• I need to take a live video stream from wowza and convert it to a JPEG Push for display in HTML5

  10 septembre 2015, par scott m gardner

  I have a live video feed that currently is served by a Wowza server as an RMTP stream. I need to create an Motion JPEG, or JPEG push stream to HTML5. I have FFMpeg, and have used it to generate individual frames from a video file, but do not know how to put it all together. Or how to package the frames together for transmission to the client.

  I am guessing that I will have to do some coding on the server side to package everything up. I will do this in Java or Scala. And on the client to handle the un packaging and display to the canvas in JavaScript.