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• Using ffmpeg in node, without using fluent-ffmpeg

  16 mai 2018, par drexdelta

  I am using ffmpeg without using fluent-ffmpeg. I am using ’child_process’ from node.

  First of all I verified how can I pass more than one arguments to the child process command. and I verified it given below code.

  I used copy command like this

  cp vid1.mp4 vid2.mp4

  which successfully copied vid1 into vid2.

  const execFile = require('child_process').execFile;
  
  const child = execFile('cp', ['vid1.mp4', 'vid3.mp4'], (error, stdout, stderr) => {
  
      if (error) {
  
          console.error('stderr: =============================', stderr);
  
          throw error;
  
      }
  
      console.log('stdout: ==========================', stdout);
  
  });
  
  
  
  console.log('here');

  Above code is content of the ’index.js’(default entry point in node). And running this with node . , which copies vid1 into vid3 successfully.

  Now, I want to do watermarking to the given video. For that I am using this tutorial. Currently link to the actual tutorial is broken, you can see it here.

  This is the command that I am using

  ffmpeg -i input.mp4 -i logo.png -filter_complex "overlay=10:10" output.mp4

  Now the same command I am using like this ,

  const execFile = require('child_process').execFile;
  
  
  
  const child = execFile('ffmpeg', ['-i', 'input.mp4' , '-i' , 'logo.png' , '-filter_complex' , '"overlay=10:10"' , 'output.mp4' ], (error, stdout, stderr) => {
  
      if (error) {
  
          console.error('stderr: =============================', stderr);
  
          throw error;
  
      }
  
      console.log('stdout: ==========================', stdout);
  
  });
  
  
  
  console.log('here');

  and I am getting an error , that ,

  No such filter : ’"overlay’ Error initializing complex filters. Invalid
  argument

  /Users/neerpatel/Desktop/testProjects/childProcess/index.js:7
  throw error ;
  ^

  Error : Command failed : ffmpeg -i input.mp4 -i logo.png
  -filter_complex "overlay=10:10" output.mp4

  You can clearly see that the same command that runs in terminal directly, doesn’t work when I pass it in child process. Why does it happen ?

  Moreover, I wanted to add tag ’watermarking’ , but I can’t create tag since my reputation is below 1500. please, someone do it.

  UPDATE :
  I used EXEC , instead of execFile . and it worked like charm, but parent file kept waiting for child process. Child process never returns END signal. and this is my code.

  const exec = require('child_process').exec;
  
  
  
  const child = exec('ffmpeg -i input.mp4 -i logo.png -filter_complex "overlay=10:10" output.mp4', (error, stdout, stderr) => {
  
      if (error) {
  
          console.error('stderr: =============================', stderr);
  
          throw error;
  
      }
  
      console.log('stdout: ==========================', stdout);
  
  });
  
  
  
  console.log('here');

• ffmpeg - remove duplicate frames block (same video sequence twice)

  11 janvier 2018, par Radoslav Kastiel

  Any idea how to remove duplicate video&audio frames blocks (several seconds repeating video sequences having same timestamps and frames corrupt file) from TS file with ffmpeg ?

  I tried :

  1) decimate filter :

  ffmpeg -i input.mp4 -vf mpdecimate,setpts=N/FRAME_RATE/TB out.mp4

  • does reencoding
  • does not remove several seconds repeated frames block

  2) playing with synchronisation options

  ffmpeg -vsync vfr -frame_drop_threshold 1500 -i in.ts -vcodec copy -acodec copy -y out.ts

  • there is no help with frame_drop_threshold attribude, no sample usage found on internet
  • does not reencode input
  • does not remove several seconds repeated frames block

  Seems ffmpeg helps :

  • just with sequence of same frames
  • not with repeating frames sequences in the stream
  • not with removing (dropping) frames with repeated timestamps

• lavc/aarch64 : add sbrdsp neon implementation

  23 mai 2017, par Matthieu Bouron

  lavc/aarch64 : add sbrdsp neon implementation
  autocorrelate_c : 644.0
  
  autocorrelate_neon : 420.0
  
  hf_apply_noise_0_c : 1688.5
  
  hf_apply_noise_0_neon : 1498.6
  
  hf_apply_noise_1_c : 1691.2
  
  hf_apply_noise_1_neon : 1500.6
  
  hf_apply_noise_2_c : 1688.1
  
  hf_apply_noise_2_neon : 1500.3
  
  hf_apply_noise_3_c : 1696.6
  
  hf_apply_noise_3_neon : 1502.2
  
  hf_g_filt_c : 2117.8
  
  hf_g_filt_neon : 1218.7
  
  hf_gen_c : 4573.4
  
  hf_gen_neon : 2461.0
  
  neg_odd_64_c : 72.0
  
  neg_odd_64_neon : 64.7
  
  qmf_deint_bfly_c : 1107.6
  
  qmf_deint_bfly_neon : 291.6
  
  qmf_deint_neg_c : 210.4
  
  qmf_deint_neg_neon : 107.4
  
  qmf_post_shuffle_c : 163.0
  
  qmf_post_shuffle_neon : 107.7
  
  qmf_pre_shuffle_c : 120.5
  
  qmf_pre_shuffle_neon : 110.7
  
  sum64x5_c : 1361.6
  
  sum64x5_neon : 435.4
  
  sum_square_c : 1686.4
  
  sum_square_neon : 787.2
  

  • [DH] libavcodec/aarch64/Makefile
  • [DH] libavcodec/aarch64/sbrdsp_init_aarch64.c
  • [DH] libavcodec/aarch64/sbrdsp_neon.S
  • [DH] libavcodec/sbrdsp.h
  • [DH] libavcodec/sbrdsp_template.c