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• How to take screenshot (high fps) in Linux (programming)

  30 août 2014, par pirobtumen

  First of all I want to say that I’ve been reading a lot about this and I’ve learnt many ways to do it, but I haven’t been able to do it in linux.

  My project is an ambilight with arduino, so I need to take a screenshot of the desktop and analyze its colour.

  At the beginning I used Processing 2.0 with the class ’Robot’ from ’java.awt’. Initially I could take 5 frames per second and then I got 13fps. This works but I want more perfomance, so I start reading.

  In Windows or Mac you have libraries that let you access directly to the ’frameBuffer’, so you can take screenshot really ’easy’ and really fast.

  In Ubuntu I have tried python with Gtk, PIL, Qt... and the fastest way is GTK but I can only have about 15fps too.

  My problem is : I want to do it cross platform but I prefer that my program work in Linux at the beginning and then in Windows (I don’t like it too much :P).

  So, the first question : is python able to offer that perfomance ? Because I think that C++ can be a better option.

  And the second question : what do I need to do it ? I’ve read about Xlib (X11) but I can’t find documentation that let me take a screenshot. Also I know, for example, FFmpeg which is a powerful tool but I don’t know how to implement it.

  I hope that you could help me (and excuse me if I’ve made any mistakes).

• Remux video file and get the output bytes on the fly

  22 septembre 2014, par Miguel Botón

  I have been looking for a solution too many hours and maybe I didn’t use the proper keywords to find it but I give up. I hope somebody can help me with this.

  My goal is to create a small C code that remux a video file to another container (mp4 or whatever, not decided yet) and create a JNI interface to read the raw output bytes in my Java application.

  Create the JNI interface is not a problem and remux the video is pretty simple (and there is a great example at http://ffmpeg.org/doxygen/trunk/doc_2examples_2remuxing_8c-example.html), but I’m having a headache trying to figure out how I can tell FFmpeg to deliver the data when my application requests it.

  I was thinking in create a thread, where the remux would be done, and write the output data to a buffer where my application would read it. When the buffer is full the remux would be paused until it is flushed, but I don’t know how I can achieve that or if it would be a proper solution.

  I believe the best solution will involve creating an AVIOContext but I’m not very sure.

  Thank you very much in advance.

  EDIT :

  A solution I found, but I don’t like it at all, is to run the "ffmpeg" executable, tell it to write the output to "stdout" and read this output from my Java application using an InputStream.

• How can I capture RTSP stream with FFMPEG continously and later decode a video

  17 avril 2020, par İsmet

  I have got a rtsp stream from camera. I don't want rtsp to mp4 file convert because that give a file like 10minute video,1 hour video. But I wanna search a specific date in stream (e.g 17.04.2020 15.00.00-16.15.00). So it have integrity data.

  



  

  



  Summary : how can I storage this rtsp stream and convert a video type (mp4,avi) with specific time part of data when I want it ?

  



  Note : Sorry for my weak Englis, I hope image tells what I want.