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• Update PNG overlay on video with ffmpeg

  16 décembre 2016, par Rodion Baskakov

  I’m trying to make an RTMP stream of a video and put some graphical data on it. I have a command which creates the output I need. The only problem is that despite of the fact the PNG image is being updated on disk during the render process, in output video the overlay stays always the same. I would like ffmpeg to take a PNG image from disk every time it has been changed (or once a minute or so) and use it as an overlay.
  Is that possible ?

  Here is the command I use to render the output :

  ffmpeg \
  
  -re -y \
  
  -f lavfi \
  
  -i "movie=filename=video/videobg.mp4:loop=0, setpts=N/(FRAME_RATE*TB)" \
  
  -loop 1 \
  
  -i images/forecast.png \
  
  -filter_complex "[1:v]format=argb,geq=r='r(X,Y)':a='0.9*alpha(X,Y)'[overlay]; [0:v][overlay]overlay" \
  
  -i data/musicbg.mp3 \
  
  -ac 1 \
  
  -ar 44100 \
  
  -b:a 128k \
  
  -vcodec libx264 \
  
  -pix_fmt yuv420p \
  
  -r 30 \
  
  -g 60 \
  
  output.mp4

• Option not found at ffmpeg

  28 décembre 2016, par AlphaWolf

  I tried to add watermark to a video using python by call subprocess ffmpeg. My code :

  command = "C:\\VidMaker\\source\\ffmpeg.win32.exe -i C:\\VidMaker\\kq"+str(i)+".mp4 -i C:\\VidMaker\\1.png -filter_complex" "[0:v]setsar=sar=1[v];[v][1]blend=all_mode='overlay':all_opacity=0.7" "-vcodec libx264 C:\VidMaker\\Res"+str(i)+".mp4"
  
  subprocess.check_call(command, shell = False)

  the result is :

  Unrecognized option 'filter_complex[0:v]setsar=sar=1[v];[v][1]blend=all_mode='overlay':all_opacity=0.7-movflags'.
  
  Error splitting the argument list: Option not found
  
  Traceback (most recent call last):
  
    File "C:\VidMaker\add.py", line 10, in <module>
  
      subprocess.check_call(command, shell = False)
  
    File "C:\Python27\lib\subprocess.py", line 186, in check_call
  
      raise CalledProcessError(retcode, cmd)
  
  subprocess.CalledProcessError: Command 'C:\VidMaker\source\ffmpeg.win32.exe -n -i C:\VidMaker\kq2.mp4 -i C:\VidMaker\1.png -filter_complex[0:v]setsar=sar=1[v];[v][1]blend=all_mode='overlay':all_opacity=0.7-movflags +faststart C:\VidMaker\Res2.mp4' returned non-zero exit status 1
  
  [Finished in 0.4s with exit code 1]
  
  </module>

  edit1 : it run ok without option :

  command = "C:\\VidMaker\\source\\ffmpeg.win32.exe -i C:\\VidMaker\\kq"+str(i)+".mp4 -i C:\\VidMaker\\1.png -filter_complex overlay=10:10 C:\VidMaker\\Res"+str(i)+".mp4"

  What happen with the option and how can fix it ?Thanks !

  edit2 : i need to call like that because my VPS cannot run like my computer, in my computer it run successfully with :

   subprocess.call(['ffmpeg', 
  
    '-i', 'funvi 155.mp4',
  
    '-i', '1.png',
  
    '-filter_complex', "[1:v]format=argb,geq=r='r(X,Y)':a='0.15*alpha(X,Y)'[zork]; [0:v][zork]overlay", 
  
    '-vcodec', 'libx264',
  
    'myresult6.mp4'])

• ffmpeg exr sequence to mov with h264 encoding

  19 mars 2017, par JokerMartini

  How can I convert a sequence of exr’s to a mov file with h264 compression ? I’ve been messing with this for quite some time now and haven’t been able to get it to work at all.
  Here is what i have so far.

  

  setlocal
  
  
  
  :: VARIABLES
  
  SET ffmpeg="C:/ffmpeg/bin/ffmpeg.exe"
  
  SET IMAGES="C:/Users/JokerMartini-Asus/Desktop/Trash/exr/teapot.%04d.exr"
  
  SET OUTPUT="C:/Users/JokerMartini-Asus/Desktop/Trash/exr/teapot.mp4"
  
  
  
  ::%ffmpeg% -y -f image2 -i %IMAGES% %OUTPUT%
  
  "C:/ffmpeg/bin/ffmpeg.exe" -y -f image2 -i "%IMAGES%" "%OUTPUT%"
  
  
  
  endlocal
  
  echo - Complete!
  
  ::pause