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• How can I bundle a precompiled binary with electron

  10 novembre 2018, par UltrasoundJelly

  I am trying to include a precompiled binary with an electron app. I began with electron quick start app and modified my renderer.js file to include this code that is triggered when a file is dropped on the body :

  spawn = require('child_process').spawn,
  
    ffmpeg = spawn('node_modules/.bin/ffmpeg', ['-i', clips[0], '-an', '-q:v', '1', '-vcodec', 'libx264', '-y', '-pix_fmt', 'yuv420p', '-vf', 'setsar=1,scale=trunc(iw/2)*2:trunc(ih/2)*2,crop=in_w:in_h-50:0:50', '/tmp/out21321.mp4']);
  
  
  
  ffmpeg.stdout.on('data', data => {
  
    console.log(`stdout: ${data}`);
  
  });
  
  ffmpeg.stderr.on('data', data => {
  
    console.log(`stderr: ${data}`);
  
  });

  I have placed my precompiled ffmpeg binary in node_modules/.bin/. Everything works great in the dev panel, but when I use electron-packager to set up the app, it throws a spawn error ENOENT to the console when triggered. I did find a very similar question on SO, but the question doesn’t seem to be definitively answered. The npm page on electron-packager does show that they can be bundled, but I cannot find any documentation on how to do so.

• mouse cursor strange within office 2010 ppt presentation video

  5 décembre 2015, par Wesley

  I hit a problem that record office 2010 ppt presentation.

  I wanna record ppt presentation process,so, here is my steps :
  1. open and ppt file
  2. press F5 to start the presentation
  3. use third party tool to record the screen
  4. during presentation, press CTRL+P to open the mark pen(on screen, it’s laser point)

  So, here comes the problem :
  After I finished the video record, when I play the vedio, the cursor is very strange to be an bold red plus, like below :
  

  It’s really ugly..
  Actually I want it to be a icon like a pen, or at least to be a laser point as default.
  Firstly I thought it to be problem with my screen recording tool, so I write a script with python to record presentation screen using ffmpeg, but, with the same result..

  So, anyone hit this before ?
  How to fix this ?

  Thanks.
  Wesley

• ffmpeg-python crossfade transition for unknown number of photos

  28 septembre 2020, par Saya

  I want to convert a bunch of photos into a video with crossfade between them. The number of photos I am converting is variable
I am using the code from HERE to apply the crossfade :

  


  Since the number of photos are variable I looped over all the photos in the directory and generated the -loop and also the second part ([0:v]fade=t=out:st=4:d=1[v0] ;) :

  


  for i in range(os.listdir('photos')):
    if i == 0:
        text += f'\n-loop 1 -t 60 -i photos/Image{i+1}.jpg \\\n'
        text2 = '\n[0:v]fade=t=out:st=4:d=1[v0]; \\\n'
    else:
        text += f'-loop 1 -t 60 -i photos/Image{i+1}.jpg \\\n'
        text2 += f' [{i}:v]fade=t=in:st=0:d=1,fade=t=out:st=4:d=1[v{i}]; \\\n'

#And the Subprocess part  

command = f'ffmpeg \
    {text} \
    -filter-complex \
    {text2} -map "[v]" video/out.mp4'
p = subprocess.call(command, shell=True) 


  


  But this thing didn't create any video but said this :

  


  Use -h to get full help or, even better, run 'man ffmpeg'


  


  The full output :

  


  ffmpeg version git-2019-11-11-20c5f4d Copyright (c) 2000-2019 the FFmpeg developers
  built with gcc 9.2.1 (GCC) 20191010
  configuration: --enable-gpl --enable-version3 --enable-sdl2 --enable-fontconfig --enable-gnutls --enable-iconv --enable-libass --enable-libdav1d --enable-libbluray --enable-libfreetype --enable-libmp3lame --enable-libopencore-amrnb --enable-libopencore-amrwb --enable-libopenjpeg --enable-libopus --enable-libshine --enable-libsnappy --enable-libsoxr --enable-libtheora --enable-libtwolame --enable-libvpx --enable-libwavpack --enable-libwebp --enable-libx264 --enable-libx265 --enable-libxml2 --enable-libzimg --enable-lzma --enable-zlib --enable-gmp --enable-libvidstab --enable-libvorbis --enable-libvo-amrwbenc --enable-libmysofa --enable-libspeex --enable-libxvid --enable-libaom --enable-libmfx --enable-ffnvcodec --enable-cuvid --enable-d3d11va --enable-nvenc --enable-nvdec --enable-dxva2 --enable-avisynth --enable-libopenmpt --enable-amf
  libavutil      56. 35.101 / 56. 35.101
  libavcodec     58. 61.100 / 58. 61.100
  libavformat    58. 34.101 / 58. 34.101
  libavdevice    58.  9.100 / 58.  9.100
  libavfilter     7. 66.100 /  7. 66.100
  libswscale      5.  6.100 /  5.  6.100
  libswresample   3.  6.100 /  3.  6.100
  libpostproc    55.  6.100 / 55.  6.100
Hyper fast Audio and Video encoder
usage: ffmpeg [options] [[infile options] -i infile]... {[outfile options] outfile}...

Use -h to get full help or, even better, run 'man ffmpeg'