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• How to correctly detect window with xdotool in bash script

  24 mai 2020, par wasd

  I'm trying to record screen and also input from my webcam. To show image from a webcam I use ffplay. However I want it to be placed in a specific location of my screen. To do so I use xdotool and following bash script :

  



   #!/bin/bash                                                                                                                                                                                                                                   
 ffplay -i /dev/video0 &                                                                                                                                                                                       
 res=$!                                                                                                                  
 echo $res                                                                                                               
 window_pid=$(xdotool search --pid $res)                                                                                       
 echo $window_pid
 xdotool windowmove $window_pid 1200 200                                                                                                       
 wait


  



  For some reason I get correct process id res but nothing for the window_pid. If I run similar commands in terminal it works correctly (I run ffplay in one terminal instance and the rest of commands in another). What am I missing here ?

  


• Bash Script to get info from ffprobe

  14 novembre 2016, par Alan

  I am trying to create a script to process videos, but I was hoping to get bit_rate, width, and height info from the incoming files so I could better tune the output. The script works when I do the files one at a time, but when I put it into a loop all of a sudden I don’t get any info.

  So this works :

  #!/bin/bash
  
  eval $(ffprobe -v quiet -show_format -of flat=s=_ -show_entries stream=height,width,nb_frames,duration,codec_name input.mp4);
  
  width=${streams_stream_0_width};
  
  height=${streams_stream_0_height};
  
  bitrate=$((${format_bit_rate}/1000));
  
  echo $width,$height,$bitrate;

  This doesn’t when executed from find ./ -type f -regex ".*\.\(mkv\|mp4\|wmv\|flv\|webm\|mov\|avi\)" -print0 | xargs -0 /root/newbatch.sh

  for i; do
  
  eval '$(ffprobe -v quiet -show_format -of flat=s=_ -show_entries stream=height,width,nb_frames,duration,codec_name $i)';
  
  width=${streams_stream_0_width};
  
  height=${streams_stream_0_height};
  
  bitrate=${format_bit_rate};
  
  kbitrate=$((bitrate/1000));
  
  echo $i,$width,$height,$kbitrate;
  
  
  
  done

  I also get an error with the math of bitrate in the loop, but even when I comment it out I still get no results. Since it works one at a time, I am assuming the problem is a bash scripting and nothing to do with ffmpeg / ffprobe.

  That being said, I can do this :

  echo $i,$width,$height,$bitrate;

  and get back

  ./file1.mkv,,,
  
  ./file2.mkv,,,
  
  ./file3.mkv,,,
  
  ./file4.mkv,,,

  So it does get some info back, but it loses the info from the eval statement.

• ffmpeg video slideshow script with vertical stack transition ?

  11 mai 2019, par Trần Công Trường

  I have cmd : ffmpeg -y -r 1/5 -i "C :\test\a\%0d.jpg" -r 24 "C :\test\out.mp4"
  I want slideshow script with vertical stack transition. Similar to the video below : https://www.youtube.com/watch?v=3G47V5EDJZw . Thanks