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• avcodec/dsputil/huffyuv : move diff int16 and add int16 to dsputil

  20 janvier 2014, par Michael Niedermayer

  avcodec/dsputil/huffyuv : move diff int16 and add int16 to dsputil
  This also fixes masking the bits
  Signed-off-by : Michael Niedermayer <michaelni@gmx.at>
  

  • [DH] libavcodec/dsputil.c
  • [DH] libavcodec/dsputil.h
  • [DH] libavcodec/huffyuvdec.c
  • [DH] libavcodec/huffyuvenc.c

• Running a 2-pass video conversion using Python's subprocess module and ffmpeg

  22 novembre 2012, par ensnare

  I'm trying to convert a bunch of videos to play on my iPad. I'm using the subprocess module, which from what I understand launches a binary in a separate process from my script. I'm not sure how to handle 2-pass encoding which requires that the first process terminate before the second begin.

  Here is my code :

  def convert(filename):
  
    extension = filename[-3:]
  
  
  
    destination_filename_720 = filename[-4:] + '-a720p' + '.mp4'
  
    destination_filename_1080 = filename[-4:] + '-a1080p' + '.mp4'
  
  
  
    p = subprocess.Popen(['ffmpeg','-i', str(filename) ,
  
                          '-acodec' , 'aac' ,
  
                          '-ab' , '160k' ,
  
                          '-ac' , '2' ,
  
                          '-vcodec' , 'libx264' ,
  
                          '-strict' , '-2' ,
  
                          '-vpre' , 'ipod640' ,
  
                          '-threads' , '8' ,
  
                          '-s' , '1280x720' ,
  
                          '-b:v' , '2000k' ,
  
                          '-pass' , '1' ,
  
                          '-y' ,
  
                          destination_filename_720])
  
  
  
    p = subprocess.Popen(['ffmpeg','-i', str(filename) ,
  
                          '-acodec' , 'aac' ,
  
                          '-ab' , '160k' ,
  
                          '-ac' , '2' ,
  
                          '-vcodec' , 'libx264' ,
  
                          '-strict' , '-2' ,
  
                          '-vpre' , 'ipod640' ,
  
                          '-threads' , '8' ,
  
                          '-s' , '1280x720' ,
  
                          '-b:v' , '2000k' ,
  
                          '-pass' , '2' ,
  
                          '-y' ,
  
                          destination_filename_720])

  As soon as the convert() function is called, both processes are spawned immediately.

  The second process fails because the first process hasn't yet finished.

  How can I fix this ? Or, is there a better way ?

• inotifywait -m does not process more than 1 file after long running process

  2 mai 2022, par Yllier123

  I have a script that detects files on close_write and runs an 5 minute process on them. These files are written to the directory in batches of up to 100. The issue is that inotifywait only detects the first file in the batch and does not process the subsequent files unless they are removed from the directory by hand and put back. Here is my script :

  


  #!/bin/bash

inotifywait -r -e close_write -e moved_to --format "%f" $TARGET -m | while read file
    do
        if [[ "$file" =~ .*mp4$ ]]; then
            echo "Detected $file"
            /usr/bin/python3 LongRunningProgram.py -i $TARGET/$file -o $PROCESSED -u $UPLOADPATH -c $C
        fi
    done


  


  it is maintained by a systemctl service written like so :

  


  [Unit]
Description=Description
After=network.target

[Service]
Type=idle
user=pi
WorkingDirectory=/home/pi
ExecStart=/bin/bash /home/pi/notify.sh OutPath C
Restart=on-failure

[Install]
WantedBy=multi-user.target


  


  I am confused as to why it only seems to recognize the first file but not subsequent files when run like this, however if I replace the long running program with sleep 300 it seems to work fine.