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• How To Make Make A Video File From Images Using FFMPEG If Your Images Start At A Random Number [duplicate]

  13 mai 2019, par teot 59

  This question already has an answer here :

  • How to convert all png files from a particular number to gif using FFmpeg
    
    1 answer
    
  • Create video from image sequence starting at image_100
    
    1 answer
    

  So I am making a program on my raspberry pi and I am constantly saving pictures in the background and deleting them. So for instance in the images folder I have images from 123.png to 234.png

  for now I have been using this command :

  os.system("ffmpeg -f image2 -r 15 -pattern_type glob -i 'videos/*.png' -vcodec mpeg4 -y movie.avi")

  But it’s unreliable, because it mixes image numbers up

  (sorry for bad English)

• FFMPEG command works in shell ! but not in my node.js

  29 juillet 2021, par Kuno Kim

  When my ffmpeg command is built by my node.js application it does not run.

  



  error

  



  Unrecognized option 'ss 3.2 -t 1.9 -i videoplayback.mp4 -vf  fps=15,scale=240:-1:flags=lanczos,palettegen palette.png'.


  



  command

  



  ffmpeg -ss 3.2 -t 1.9 -i videoplayback.mp4 -vf \ fps=15,scale=240:-1:flags=lanczos,palettegen palette.png


  



  this is my code

  



  var child_process = require('child_process')

function recordVideo() {

var spawn = child_process.spawn;

var args = [
    '-y', 
    '-ss', '3.2',
    '-t', '1.9', 
    '-i', '../getback/bin/videos/videoplayback.mp4', 
    '-vf', ' \\ ', 
    'fps=', '15', 
    'scale=', '320:-1', 
    'flags=','lanczos,palettegen palette.png', 
];



var ffmpeg = spawn('ffmpeg', args);

ffmpeg.stdout.on('data', function (data) {
    console.log(data);
});

ffmpeg.stderr.on('data', function (data) {
    console.log('grep stderr: ' + data);
});

ffmpeg.on('close', (code) => {
    console.log('child process exited with code ' + code);
}); 
};
recordVideo();


  



  what is this error ?
I think.. 'fps=', '15', In the following code 
 '=' options a problem.

  



  I am still learning English.
I'm sorry if it was hard to understand.

  


• FFmpeg (sharpFFmpeg) decoding - Protected memory error

  25 août 2011, par mazharenko.a

  I'm trying to use C# binding of FFmpeg library calling SharpFFmpeg to decode H264 video stream that I receive by RTP. I think I correctly decapsulate NALUs from RTP-packets, but I can't decode complete frames. Function avcodec_decode_video calling throws an AccessViolationException (Attempted to read or write protected memory).
  Here are some code lines :

      //buf is a byte array containing encoded frame
  
      int success;
  
      FFmpeg.avcodec_init();
  
      FFmpeg.avcodec_register_all();
  
      IntPtr codec = FFmpeg.avcodec_find_decoder(FFmpeg.CodecID.CODEC_ID_H264);
  
      IntPtr codecCont = FFmpeg.avcodec_alloc_context(); //AVCodecContext
  
      FFmpeg.avcodec_open(codecCont, codec);
  
      IntPtr frame = FFmpeg.avcodec_alloc_frame();  //AVFrame
  
      FFmpeg.avcodec_decode_video(codecCont, frame, ref success, (IntPtr)buf[0], buf.Length); //exception

  Function has been imported as follows :

      [DllImport("avcodec.dll", CallingConvention = CallingConvention.Cdecl), SuppressUnmanagedCodeSecurity]
  
      public unsafe static extern int avcodec_decode_video(IntPtr pAVCodecContext, IntPtr pAVFrame, ref int got_picture_ptr, IntPtr buf, int buf_size);

  Unfortunately, I don't know what do I have to do with the codecCont. Somebody wrote that it is needed to fill this structure by AVCDCR using session description received by RTSP. But I don't know which field(s) store this record.
  I'll be glad for any help.
  P.S. Excuse me for my English