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• Moving files into sub folders based by average filesize

  5 février 2016, par darkshaed

  I need the help of you programming savants in creating a batch script or powershell script that will move and divide a group of files from one directory into 4 subdirectories based on an average total filesize. After the sort, the sub-directories should be roughly equal in terms of folder size.

  Why do I need this ?

  I have 4 computers that I would like to utilize for encoding via FFMPEG and it would be helpful for a script to divide a folder into 4 parts (sub-directories) based on a total average size.

  So lets say there are an assortment of movie files with varying different file sizes totaling to 100 GB, the script would divy the movie files and move them into 4 sub folders ; each folder having around 25 GB. Doing this will allow the 4 machines to encode the sum of the data equally and efficiently.

  After all that encoding I’ll have 2 files, XYZ.(original Extension) and XYZ.264, A script that could compare the 2 files and delete the larger file would be extremely helpful and cut down on manual inspection.

  Thank you, I hope this is possible.

• NReco ffmpeg library error

  19 janvier 2016, par agurodriguez

  I’m using NReco.VideoConverter for a video converting application. Now I’m trying to replace the audio in the source video for an mp3 track. I’m using this snippet from the official site : http://www.nrecosite.com/video_converter_net.aspx but I receiving this error :

  audio.mp3 : Invalid data found when processing input (exit code : 1)

  var ffmpeg = new NReco.VideoConverter.FFMpegConverter();
  
  ffmpeg.ConvertMedia("video.mp4", null, "output_video.mp4", null, new ConvertSettings() {
  
    AudioCodec = "copy", VideoCodec = "copy",
  
    CustomInputArgs = String.Format(" -i \"{0}\" ", "audio.mp3"),
  
    CustomOutputArgs = " -map 0 -map 1",
  
  });

  I tried with different audio files but still the same scenario.

  Hope you can help me !
  Regards

• FFMPEG - Get the exact calculated audio filesize after encode

  14 janvier 2016, par Youssef El Gharbaoui

  Im trying to guess an audio (mp3) filesize before encode with ffmpeg, afterward, need to have the exact calculated filesize.

  Here is the formula im using to predict and calculate the filesize (hope im not wrong) :

  ( Bitrates x Duration ) / 8) x 1000 = Filesize in Bytes.

  Im going to give a real example so that everyone can understand the use case.

  Example :

  Having an m4a file with the following data :

  • Name : Assuming xxx.m4a
  • Filesize : 8 304 014 bytes (8,3 Mo)
  • Bitrates : 256k
  • Duration : 260 seconds

  Expected filesize : ( (256 x 260) / 8 ) x 1000 = 8 320 000 bytes

  Then im running the following ffmpeg command :

  ffmpeg -i xxx.m4a -f mp3 -y -minrate 256k -maxrate 256k -bufsize 256k -b:a 256k -fs 8320000 output.mp3

  Console output :

  ffmpeg version 2.7.2 Copyright (c) 2000-2015 the FFmpeg developers
  
    built with Apple LLVM version 6.1.0 (clang-602.0.53) (based on LLVM 3.6.0svn)
  
    configuration: --prefix=/usr/local/Cellar/ffmpeg/2.7.2_1 --enable-shared --enable-pthreads --enable-gpl --enable-version3 --enable-hardcoded-tables --enable-avresample --cc=clang     --host-cflags= --host-ldflags= --enable-opencl --enable-libx264 --enable-libmp3lame --enable-libvo-aacenc --enable-libxvid --enable-vda
  
    libavutil      54. 27.100 / 54. 27.100
  
    libavcodec     56. 41.100 / 56. 41.100
  
    libavformat    56. 36.100 / 56. 36.100
  
    libavdevice    56.  4.100 / 56.  4.100
  
    libavfilter     5. 16.101 /  5. 16.101
  
    libavresample   2.  1.  0 /  2.  1.  0
  
    libswscale      3.  1.101 /  3.  1.101
  
    libswresample   1.  2.100 /  1.  2.100
  
    libpostproc    53.  3.100 / 53.  3.100
  
  Input #0, mov,mp4,m4a,3gp,3g2,mj2, from 'xxx.m4a':
  
    Metadata:
  
      major_brand     : isom
  
      minor_version   : 512
  
      compatible_brands: isomiso2mp41
  
      encoder         : Lavf56.36.100
  
    Duration: 00:04:20.53, start: 0.000000, bitrate: 254 kb/s
  
      Stream #0:0(und): Audio: aac (LC) (mp4a / 0x6134706D), 44100 Hz, stereo, fltp, 253 kb/s (default)
  
      Metadata:
  
        handler_name    : SoundHandler
  
  Output #0, mp3, to 'output.mp3':
  
    Metadata:
  
      major_brand     : isom
  
      minor_version   : 512
  
      compatible_brands: isomiso2mp41
  
      TSSE            : Lavf56.36.100
  
      Stream #0:0(und): Audio: mp3 (libmp3lame), 44100 Hz, stereo, fltp, 256 kb/s (default)
  
      Metadata:
  
        handler_name    : SoundHandler
  
        encoder         : Lavc56.41.100 libmp3lame
  
  Stream mapping:
  
    Stream #0:0 -> #0:0 (aac (native) -> mp3 (libmp3lame))
  
  Press [q] to stop, [?] for help
  
  size=    8127kB time=00:04:20.02 bitrate= 256.1kbits/s    
  
  video:0kB audio:8127kB subtitle:0kB other streams:0kB global headers:0kB muxing overhead: 0.011765%    

  Problem and Questions :

  • Can you tell me why im I getting an output with 8 322 546 bytes and
    not 8 320 000 as expected ?
  • Is there something wrong in my formula or the ffmpeg command ?
  • What solution can you suggest to get the exact predicted filesize ?

  Thank you in advance.