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• How to run vid.h264 in python 2.7

  22 mars 2017, par sks

  I want to play a video of .h264 format (output of a webcam) using a python script. Here is the code for that :

  import numpy as np
  
  import cv2
  
  
  
  cap = cv2.VideoCapture('cam1.h264')
  
  
  
  while(True):
  
      # Capture frame-by-frame
  
      ret, frame = cap.read()
  
      print 'p'
  
      if ret==True:
  
          print "g"
  
          # Our operations on the frame come here
  
          gray = cv2.cvtColor(frame, cv2.COLOR_BGR2GRAY)
  
  
  
          # Display the resulting frame
  
          cv2.imshow('frame', gray)
  
          if cv2.waitKey(1) & 0xFF == ord('q'):
  
              break
  
  
  
  # When everything done, release the capture
  
  cap.release()
  
  cv2.destroyAllWindows()

  But it only prints p. It never goes inside the loop. Whereas when i play the same video using ffplay (ffmpeg) in command prompt this video runs fine. FFMPEG path is set in windows as well as it is present in the python27 folder.
  What am i doing wrong ?

• tests/fate/hevc : add a periodic intra refresh decode test

  4 septembre 2024, par Anton Khirnov

  tests/fate/hevc : add a periodic intra refresh decode test
  Would trigger #10887 before it was fixed, sample cut from the one
  
  attached to the bug.
  

  • [DH] tests/fate/hevc.mak
  • [DH] tests/ref/fate/hevc-pir

• ffmpeg batch reencode with subfolders

  25 janvier, par Alan

  I am trying to reencode a few hundred videos to X265 but there are many directories that have spaces in the filenames as do some of the files. I have looked at a bunch of scripts and am struggling to find one that works with the spaces and the different directory levels.

  



  This one works, as long as there is no sub directories :

  



  #!/bin/bash
for i in *.avi;
do 
    ffmpeg -i "$i" -c:v libx265 -c:a copy X265_"$i"
done


  



  I have been trying to work with this bash script, but it fails with the whitespaces I am guessing.

  



  #!/bin/bash
inputdir=$PWD
outputdir=$PWD
while IFS= read -r file ; do
  video=`basename "$file"`
  dir=`dirname "$file"`
 ffmpeg -fflags +genpts -i "$file" -c:v libx265 -c:a copy "$dir"/X265_"$video"
done < <(find "$inputdir" -name "*.avi" | head -100)


  



  On this thread it looks like a good solution for windows users, but not linux.
FFMPEG - Batch convert subfolders

  



  FOR /r %%i in (*.mp4) DO ffmpeg32 -i "%%~fi" -map 0:0 -map 0:1 -map 0:1 -c:v copy -c:a:0 aac -b:a 128k -ac 2 -strict -2 -cutoff 15000 -c:a:1 copy "%%~dpni(2)%%~xi"

  



  If you can point me to the right solution that is appropriate for bash, I would appreciate it.