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• how use pipe instead of save method in fluent-ffmpeg ?

  27 juin 2019, par Mohsen Rahnamaei

  I gonna use fluent ffmpeg to write something on video
  I use this cod

  var proc = ffmpeg(req.filePath). videoFilters(
  
    {
  
      filter: 'drawtext',
  
      options: {
  
        text: 'VERY LONG TEXT VERY VERY VERY VERY LOL!!!',
  
        fontsize: 36,
  
        fontcolor: 'white',
  
        x: '(main_w/2-text_w/2)',
  
        y: '(text_h/2)+15',
  
        shadowcolor: 'black',
  
        shadowx: 2,
  
        shadowy: 2
  
      }}
  
  
  
  )
  
  // use the 'flashvideo' preset (located in /lib/presets/flashvideo.js)
  
  .on('end', function() {
  
    console.log('file has been converted succesfully');
  
  })
  
  .on('error', function(err) {
  
    console.log('an error happened: ' + err.message);
  
  }).save('/home/gheidar/Desktop/ffmpeg_test/rt.ts');

  and everything is correct
  but I want to export this output to stream for the response of the request
  means that I want to use pipe() instead of save method

  something like this :

  var proc = ffmpeg(req.filePath). videoFilters(
  
    {
  
      filter: 'drawtext',
  
      options: {
  
        text: 'VERY LONG TEXT VERY VERY VERY VERY LOL!!!',
  
        fontsize: 36,
  
        fontcolor: 'white',
  
        x: '(main_w/2-text_w/2)',
  
        y: '(text_h/2)+15',
  
        shadowcolor: 'black',
  
        shadowx: 2,
  
        shadowy: 2
  
      }}
  
  
  
  )
  
  // use the 'flashvideo' preset (located in /lib/presets/flashvideo.js)
  
  .on('end', function() {
  
    console.log('file has been converted succesfully');
  
  })
  
  .on('error', function(err) {
  
    console.log('an error happened: ' + err.message);
  
  }).pipe(res)

  its just change in the last line
  and I get this error :

  an error happened: ffmpeg exited with code 1: pipe:1: Invalid argument

  how can export this ffmpeg command to stream response ????

• avfilter/vf_bwdif : Add a filter_line3 method for optimisation

  4 juillet 2023, par John Cox

  avfilter/vf_bwdif : Add a filter_line3 method for optimisation
  Add an optional filter_line3 to the available optimisations.
  filter_line3 is equivalent to filter_line, memcpy, filter_line
  filter_line shares quite a number of loads and some calculations in
  
  common with its next iteration and testing shows that using aarch64
  
  neon filter_line3s performance is 30% better than two filter_lines
  
  and a memcpy.
  Adds a test for vf_bwdif filter_line3 to checkasm
  Rounds job start lines down to a multiple of 4. This means that if
  
  filter_line3 exists then filter_line will not sometimes be called
  
  once at the end of a slice depending on thread count. The final slice
  
  may do up to 3 extra lines but filter_edge is faster than filter_line
  
  so it is unlikely to create any noticable thread load variation.
  Signed-off-by : John Cox <jc@kynesim.co.uk>
  
  Signed-off-by : Martin Storsjö <martin@martin.st>
  

  • [DH] libavfilter/bwdif.h
  • [DH] libavfilter/vf_bwdif.c
  • [DH] tests/checkasm/vf_bwdif.c

• decode : add a method for attaching lavc-internal data to frames

  1er juillet 2017, par Anton Khirnov

  decode : add a method for attaching lavc-internal data to frames
  Use the AVFrame.opaque_ref field. The original user’s opaque_ref is
  
  wrapped in the lavc struct and then unwrapped before the frame is
  
  returned to the caller.
  This new struct will be useful in the following commits.
  

  • [DBH] libavcodec/decode.c
  • [DBH] libavcodec/decode.h