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• How to execute the ffmpeg thumbnail extraction command using sub-process in django ?

  18 janvier 2017, par Nitish Kumar

  The following code we are using to extract the thumbnail images from video

  ffmpeg -i low.mkv -vf thumbnail=10,setpts=N/TB -r 1 -vframes 10 inputframes%03d.png

  This code is working absolutely fine on terminal, but it is giving an error when we are processing the same with subprocess in django.

  Our aim is to generate 10 Thumbnails from any length of the video

  Here is the code

  vaild_fps = "'thumbnail=10,setpts=N/TB -r 1 -vframes 10'"
  
  
  
  subprocess.call([settings.FFMPEG_PATH,
  
          '-i',
  
          input_file_path,
  
          '-vf',
  
          vaild_fps,
  
          thumbnail_output_file_path,            
  
      ]
  
  )

  Error No such filter : ’thumbnail=10,setpts=N/TB -r 1 -vframes 10’

  Error opening filters !

• ffmpeg compare 2 images Mac

  13 janvier, par Mary

  I am trying to compare two png/jpg images using ffmpeg commands in a Mac terminal from ffmpeg-image-diff location , but I have lots of errors .
I have tried
variant1 :

  


   ffmpeg -i image1.jpg -I image2.jpg -filter_complex "[0:v]format=yuv420p[main];[1:v]format=yuv420p[ref]; [main][ref]psnr=stats_file=psnrs.txt:shortest=1" -f null -


  


  variant2 :

  


  ffmpeg -i image1.png -i image2.png -filter_complex [1:v]negate[inv],[0:v][inv]mix=inputs=2 outdiff.png


  


  , but I'm getting every time

  


  Error opening input file image1.jpg.
Error opening input files: No such file or directory


  


  variant3 :

  


  ffmpeg -i image1jpg -i image2.jpg -filter_complex "[0:v]pad=iw*2:ih[bg]; [bg][1:v:0]overlay=w" output.jpg,


  


  but I have received with no output image created ...

  


  Input #0, png_pipe, from 'image1.jpg':
  Duration: N/A, bitrate: N/A
  Stream #0:0: Video: png, rgba(pc, gbr/bt709/iec61966-2-1), 888x640 [SAR 3779:3779 DAR 111:80], 25 fps, 25 tbr, 25 tbn


  


  I just want to have the differences between the 2 images in the output image.

  


  I have added the 2 images inside the ffmpeg-image-diff folder 
Can someone please help me ? Is there any other ffmpeg commands for images comparison ?
do I need to install any other libraries from ffmpeg ?, I saw that I have also have this in the terminal

  


  configuration: --prefix=/opt/homebrew/Cellar/ffmpeg/7.1_4 --enable-shared --enable-pthreads --enable-version3 --cc=clang --host-cflags= --host-ldflags='-Wl,-ld_classic' --enable-ffplay --enable-gnutls --enable-gpl --enable-libaom --enable-libaribb24 --enable-libbluray --enable-libdav1d --enable-libharfbuzz --enable-libjxl --enable-libmp3lame --enable-libopus --enable-librav1e --enable-librist --enable-librubberband --enable-libsnappy --enable-libsrt --enable-libssh --enable-libsvtav1 --enable-libtesseract --enable-libtheora --enable-libvidstab --enable-libvmaf --enable-libvorbis --enable-libvpx --enable-libwebp --enable-libx264 --enable-libx265 --enable-libxml2 --enable-libxvid --enable-lzma --enable-libfontconfig --enable-libfreetype --enable-frei0r --enable-libass --enable-libopencore-amrnb --enable-libopencore-amrwb --enable-libopenjpeg --enable-libspeex --enable-libsoxr --enable-libzmq --enable-libzimg --disable-libjack --disable-indev=jack --enable-videotoolbox --enable-audiotoolbox --enable-neon
  libavutil      59. 39.100 / 59. 39.100
  libavcodec     61. 19.100 / 61. 19.100
  libavformat    61.  7.100 / 61.  7.100
  libavdevice    61.  3.100 / 61.  3.100
  libavfilter    10.  4.100 / 10.  4.100
  libswscale      8.  3.100 /  8.  3.100
  libswresample   5.  3.100 /  5.  3.100
  libpostproc    58.  3.100 / 58.  3.100


  


  Thanks in advance,
Mary

  


• reading videos in matlab not working (the following codec(s) to be installed on your system)

  20 février 2016, par Ehab AlBadawy

  When I try to read a video in matlab v = VideoReader('t.avi'); I get this error :

  The file requires the following codec(s) to be installed on your system:
  
      video/x-msvideo

  and some time it needs mpeg codec when I try to load mpeg or mp4 video.

  I found someone referring to rename libstdc++.so.6.0 to libstdc++.so.6.0.10 but I found that I already have libstdc++.so.6.0.13

  I’m using matlab 2013 with archlinux.

  Update : I get this warring in the terminal when trying to read a video

  Failed to load plugin '/usr/lib/gstreamer-0.10/libgstpango.so':
  
  /usr/lib/libharfbuzz.so.0: undefined symbol: FT_Face_GetCharVariantIndex