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• PHP's exec() not executing command for FFmpeg

  16 septembre 2011, par tundoopani

  I have installed ffmpeg on my server and it works fine via my terminal. I'm able to successfully convert a file to webm format, so I'm sure the installation is fine. I'm also sure that I only have one installation of ffmpeg installed on my machine.

  A problem arises when I try to convert files through PHP via PHP's exec(). When I run the same commands, I ran in the terminal, nothing happens. I looked around stackoverflow and other parts of the net for some help. I tried this to see the output :

  exec($cmd, $out, $rv);
  
  echo "output is:\n".implode("\n", $out)."\n exit code:$rv\n";

  The output is : "output is : exit code:127"

  The command I'm using is in this format :

  ffmpeg -i "sample.mov" -vcodec libvpx  -r 30 -b "644k" -acodec libvorbis -ab 128000   -ar "44100" -ac 2 -s "352x198" "sample.webm"

  I've tried replacing "ffmpeg" with the full path to FFmpeg but that did not work.

  Why isn't the script running the command correctly and converting the files ?

  Thank you !

• How to convert a lump set of PPM files to a single .mp4 video using ffmpeg

  4 août 2021, par Nash G-L

  I'm trying to convert some .ppm files into a single video using ffmpeg. The images are listed as image10.ppm, image20.ppm, all the way up to image2000.ppm

  


  Essentially, there are 200 images following the format of image(1-200)0.ppm in a single folder.

  


  I've navigated to the correct folder containing the images using cd and the terminal displays this folder as the directory I'm in.

  


  Inputting the following command into the terminal :

  


  ffmpeg -r 10 -f image2 -s 500x500 -i image%04d.ppm -vcodec libx264 -crf 25  -pix_fmt yuv420p presentation_video.mp4


  


  I get the error that says :

  


  [image2 @ 0x7ff36180ba00] Could find no file with path 'image%04d.ppm' and index in the range 0-4
image%04d.ppm: No such file or directory


  


  What am I missing ? I've just downloaded ffmpeg and am fairly new in general to command line interface.

  


• swresample : add exact_rational option

  12 juin 2016, par Muhammad Faiz

  swresample : add exact_rational option
  give high quality resampling
  
  as good as with linear_interp=on
  
  as fast as without linear_interp=on
  
  tested visually with ffplay
  
  ffplay -f lavfi "aevalsrc=’sin(10000*t*t)’, aresample=osr=48000, showcqt=gamma=5"
  
  ffplay -f lavfi "aevalsrc=’sin(10000*t*t)’, aresample=osr=48000:linear_interp=on, showcqt=gamma=5"
  
  ffplay -f lavfi "aevalsrc=’sin(10000*t*t)’, aresample=osr=48000:exact_rational=on, showcqt=gamma=5"
  slightly speed improvement
  
  for fair comparison with -cpuflags 0
  
  audio.wav is 1 hour 44100 stereo 16bit wav file
  
  ffmpeg -i audio.wav -af aresample=osr=48000 -f null -
  
          old         new
  
  real    13.498s     13.121s
  
  user    13.364s     12.987s
  
  sys      0.131s      0.129s
  linear_interp=on
  
          old         new
  
  real    23.035s     23.050s
  
  user    22.907s     22.917s
  
  sys      0.119s     0.125s
  exact_rational=on
  
  real    12.418s
  
  user    12.298s
  
  sys      0.114s
  possibility to decrease memory usage if soft compensation is ignored
  Signed-off-by : Muhammad Faiz <mfcc64@gmail.com>
  

  • [DH] libswresample/arm/resample_init.c
  • [DH] libswresample/options.c
  • [DH] libswresample/resample.c
  • [DH] libswresample/resample.h
  • [DH] libswresample/resample_template.c
  • [DH] libswresample/soxr_resample.c
  • [DH] libswresample/swresample.c
  • [DH] libswresample/swresample_internal.h
  • [DH] libswresample/version.h
  • [DH] libswresample/x86/resample_init.c