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• code for image to video convert in android programmatically ?

  11 juin 2015, par Bipin

  How to create the video from series of png images. Is it possible in android can any body suggest me to do that ?

  I am try For that FFMPEG Library And run sample app using FFMPEG ..
  But I want To the Complete Code To convert sd card Images to Video .

• How to record all dynamic videos in the process of capturing screen video with ffmpeg from a python program ?

  4 décembre 2020, par fengnix

  I have many robotframework test cases and in the first case, a ffmpeg command like the following is invoked to record the whole running process :

  


  ffmpeg -framerate 30 -f gdigrab -i desktop -c:v libx264rgb -crf 0 -preset ultrafast output.mkv


  


  Whenever I firstly run all cases and then manuually run the above command from an addition command console, the recorded video always looks fine, it looks like all contents on the screen can be correctly captured.

  


  However, once I execute the command the same as the above one in the first case by call the following code :

  


  p=subprocess.Popen(cmd, shell=True, stdin=subprocess.PIPE, stdout=subprocess.PIPE, stderr=subprocess.PIPE)


  


  and then in the final test case the record process is stopped by calling the following code to tell ffmpeg that we want to stop the recording :

  


  p.stdin.write(bytes("q",'UTF-8'))  


  


  the final result video only contain correct contents of the "start" and the "end" of the whole process, but all other contents no longer changed and seemd just a static image, which means all the dynamic effects on the screen cannot be captured.

  


  Could anyone be so kind as to let me know what the matter is and how to solve it ?

  


• imgutils : add function to clear an image to black

  22 juillet 2017, par wm4

  imgutils : add function to clear an image to black
  Black isn't always just memset(ptr, 0, size). Limited YUV in particular
  
  requires relatively non-obvious values, and filling a frame with
  
  repeating 0 bytes is disallowed in some contexts. With component sizes
  
  larger than 8 or packed YUV, this can become relatively complicated. So
  
  having a generic function for this seems helpful.
  In order to handle the complex cases in a generic way without destroying
  
  performance, this code attempts to compute a black pixel, and then uses
  
  that value to clear the image data quickly by using a function like
  
  memset.
  Common cases like yuv410p10 or rgba can't be handled with a simple
  
  memset, so there is some code to fill memory with 2/4/8 byte patterns.
  
  For the remaining cases, a generic slow fallback is used.
  Signed-off-by : Anton Khirnov <anton@khirnov.net>
  Merged from Libav commit 45df7adc1d9b7.
  

  • [DH] doc/APIchanges
  • [DH] libavutil/imgutils.c
  • [DH] libavutil/imgutils.h
  • [DH] libavutil/version.h