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• syntax error in shell_exec php

  1er avril 2018, par Gerag2

  I’m stumped seems everything is right don’t know why it gives an error

  <?php
  
      echo "Starting ffmpeg...\n\n";
  
      echo shell_exec("ffmpeg -i /var/www/vhosts/site.com/httpdocs/Videos/*.* -i "$i" -c:v libx264 -crf 24  /var/www/vhosts/site.com/httpdocs/Videos/Output/"${i%.*}.mp4 null >/dev/null 2>/var/log/ffmpeg.log &");
  
      echo "Done.\n";
  
  ?>

  and yes this codes runs in terminal

  for i in *.*; do ffmpeg -i "$i" -c:v libx264 -crf 24 n/"${i%.*}.mp4"; done

• 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

• 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