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• how to add reference movie into ffmpeg psnr filter in codes (computing psnr)

  15 octobre 2016, par user1317278

  I just want to find out how to use the psnr filter in ffmpeg in codes.

  I have followed the codes stated in https://ffmpeg.org/ffmpeg-filters.html#psnr :

  sprintf(args, "movie=ref_movie.avi [main];[main][ref] psnr=\"stats_file=stats.log\" [out]");
  
  err = avfilter_graph_create_filter(&psnrCtx,  psnrFilter, "psnr", args, NULL, m_filterGraph);
  
  if ( err < 0 ) {
  
      avfilter_graph_free(&m_filterGraph);
  
      m_filterGraph = NULL;
  
      return false; }

  But the error message return to me :

  Option 'movie' not found

  I also try this :

  sprintf(args, "stats_file=stats.log");
  
  err = avfilter_graph_create_filter(&psnrCtx,  psnrFilter, "psnr", args, NULL, m_filterGraph);
  
  if ( err < 0 ) {
  
     avfilter_graph_free(&m_filterGraph);
  
     m_filterGraph = NULL;
  
     return false; }
  
  err = avfilter_link(last_ctx, 0, psnrCtx, 0);
  
  if ( err < 0 ) {
  
     avfilter_graph_free(&m_filterGraph);
  
     m_filterGraph = NULL;
  
     return false;}
  
  
  
  ...  
  
  err = avfilter_graph_config(m_filterGraph, NULL);
  
  if ( err < 0 ) {
  
     avfilter_graph_free(&m_filterGraph);
  
     m_filterGraph = NULL;
  
     return false;
  
  }

  but the error message return to me :

  Input pad "reference" with type video of the filter instance "psnr" of psnr not connected to any source

  I search psnr filter in codes but there is not much information about it. Can anyone help on this ?

• Making a movie from the url using ffmpeg and phantomjs

  1er novembre 2016, par Matt

  Im Taking screen shots from a url, using phantomjs using the setIntreval function (25 right now) and then piping the output to the ffmpeg (Using the frame rate -r 24).
  Here is the Code. ffmpeg.js

  var page = require('webpage').create();
  
  page.viewportSize = { width: 1024, height: 768 };
  
  
  
  page.open('http://ewoken.github.io/Leaflet.MovingMarker/', function () {
  
    setInterval(function() {
  
      page.render('/dev/stdout', { format: "png" });
  
    }, 25);
  
  });

  Then I run the script using this.

  phantomjs ffmpeg.js | ffmpeg -y -c:v png -f image2pipe -r 24 -t 10 -i - -c:v libx264 -pix_fmt yuv420p -movflags +faststart output.mp4

  Like In the command Im getting the 10 sec video with the page, But Its all speeding up fast first and completely freezes with a last frame.

  Can you guys help me, with a work around, enabling me to record the page , AS IS ? Like if there is a 3000 delay animation in the movie, It should appear like real in the movie, like smooth and in real time.

  Thank you guys. Stuck on this for a long time now.

  Cheers,

• mov : Evaluate the movie display matrix

  24 octobre 2016, par Vittorio Giovara

  mov : Evaluate the movie display matrix
  This matrix needs to be applied after all others have (currently only
  
  display matrix from trak), but cannot be handled in movie box, since
  
  streams are not allocated yet. So store it in main context, and apply
  
  it when appropriate, that is after parsing the tkhd one.
  Fate tests are updated accordingly.
  Signed-off-by : Vittorio Giovara <vittorio.giovara@gmail.com>
  

  • [DBH] libavformat/isom.h
  • [DBH] libavformat/mov.c
  • [DBH] tests/ref/fate/mov-dar
  • [DBH] tests/ref/fate/mov-display-matrix
  • [DBH] tests/ref/fate/mov-sar