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• Is it possible to use FFmpeg to cut "random" sections from a folder of videos and concat them into 1 video ?

  14 novembre 2018, par EmmyStrand

  I realize this sounds like an easy question, and one that has been answered before. However, I cannot seem to find a script which can read a folder of videos with varying lengths, copy a random segment from each video, and concat them into a single video.

  An example :

  I have a folder with 150 videos labeled Fashion-Setlist-01.mp4, Fashion-Setlist-02.mp4, etc.
  Each are over 1 hour. I would like to pull a random 10 seconds section from each video and then randomly add them together resulting in a video. This may seem easy with only a few videos, but the plan is to read from potentially 100’s of videos. It should be possible to pull multiple sections from each video as well. I suppose we could run the script twice for more segments if the video needed to be longer.

• How to pass the output of one program (ffmpeg) to python script ?

  8 septembre 2017, par Victor Odouard

  What I would like to do is this :

  ffmpeg -i udp://224.10.10.10:15004 -qscale:v 2 sttest%04d.jpg

  And then pass the output image paths of this to a python script, which individually takes in the images and manipulates them, as ffmpeg is running (eventually I will use ffmpy to call ffmpeg rather than using the command line tool, but for now testing purposes, I’m starting here).

  I suppose a way to do this would be to look into the directory of the ffmpeg output every time I’ve processed an image to see if there is a new one, and then load that into python (using OpenCV)—and then waiting a certain time interval if there are no new images to process.

  But is there a better way of doing this, like sending the paths of the images directly to some sort of queue which the python script can then process one by one ?

• libav : Filling AVFrame with RGB24 sample data ?

  31 mai 2012, par Ashika Umanga Umagiliya

  I am trying to fill sample data for a AVFrame initialized with RGB24 format.
  I use following code snippet to populate RGB data.
  But in the encoded video,I can only see grayscale strip covering only 1/3 of the videoframe.
  This code snippet suppose to fill only Red color.
  Any tips what Im doing wrong here ?

  AVFrame *targetFrame=.....
  
  int height=imageHeight();
  
  int width=imageWidth();
  
  
  
  
  
    for(y=0;ydata[0][(y* width)+x]=(x%255); //R  
  
     targetFrame->data[0][(y* width)+x+1]=0;     //G
  
     targetFrame->data[0][(y* width)+x+2]=0;     //B
  
  
  
  
  
    }
  
     }