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• tf.contrib.signal.stft returns an empty matrix

  9 décembre 2017, par matt-pielat

  This is the piece of code I run :

  import tensorflow as tf
  
  
  
  sess = tf.InteractiveSession()
  
  
  
  filename = 'song.mp3' # 30 second mp3 file
  
  SAMPLES_PER_SEC = 44100
  
  
  
  audio_binary = tf.read_file(filename)
  
  
  
  pcm = tf.contrib.ffmpeg.decode_audio(audio_binary, file_format='mp3', samples_per_second=SAMPLES_PER_SEC, channel_count = 1)
  
  stft = tf.contrib.signal.stft(pcm, frame_length=1024, frame_step=512, fft_length=1024)
  
  
  
  sess.close()

  The mp3 file is properly decoded because print(pcm.eval().shape) returns :

  (1323119, 1)

  And there are even some actual non-zero values when I print them with print(pcm.eval()[1000:1010]) :

  [[ 0.18793298]
  
   [ 0.16214484]
  
   [ 0.16022217]
  
   [ 0.15918455]
  
   [ 0.16428113]
  
   [ 0.19858395]
  
   [ 0.22861415]
  
   [ 0.2347789 ]
  
   [ 0.22684409]
  
   [ 0.20728172]]

  But for some reason print(stft.eval().shape) evaluates to :

  (1323119, 0, 513) # why the zero dimension?

  And therefore print(stft.eval()) is :

  []

  According to this the second dimension of the tf.contrib.signal.stft output is equal to the number of frames. Why are there no frames though ?

• using ffmpeg to automate splitting video into quarters and stacking

  14 novembre 2017, par user3297049

  I need to create a quick FFMPEG batch file that takes a very wide video file and splits it into quarters (dimension wise not time wise), then outputting a file where each quarter is under the previous.

  E.g.

  A B C D

  Would become :

  A
  B
  C
  D

  I know this should be possible with crop and pad commands, and through research I’ve found that someone divided into quarters and put the top left and bottom right next to each other horizontally using :

  "%~dp0\ffmpeg.exe" -i %1 -filter_complex "[0:0]crop=iw/2:ih/2:0:0,pad=iw*2:ih:0:0[tl];[0:0]crop=iw/2:ih:iw/2:ih/2[br];[tl][br]overlay=W/2" -b:v 32000k -b:a 128k %1_2.avi

  Can anyone help as the command line is beyond me ?

• cant upload a .webm file after recording

  14 octobre 2017, par Syed Abdur Rehman Kazmi

  I kinda seem to stuck on something. I am missing something i dont know. I have uploaded a lot of files but somehow when i recorded this file via my laptop camera browser and try to upload it.. it doesnt.. I am also using ffmpeg to convert it.

  Laravel 5.4
  vuejs
  ffmpeg

  These are the tools involved the error i am getting is the file doesnt exist in local temp folder. ( i have checked it IS NOT there i dont understand why )

  This is the code i am using :

          $input = $request->only('video' , 'url' , 'blob');
  
      $input['file'] =$request->file('blob');
  
  
  
      $ffmpeg = FFMpeg::create([
  
          'ffmpeg.binaries'  => 'C:/FFmpeg/bin/ffmpeg.exe',
  
          'ffprobe.binaries' => 'C:/FFmpeg/bin/ffprobe.exe'
  
      ]);
  
      $video = $ffmpeg->open($input['file']);
  
      $video
  
          ->filters()
  
          ->resize(new Dimension(320, 240))
  
          ->synchronize();
  
      $video
  
          ->frame(TimeCode::fromSeconds(10))
  
          ->save('frame.jpg');
  
      $video
  
          ->save(new Video\X264(), 'export-x264.mp4')
  
          ->save(new Video\WMV(), 'export-wmv.wmv')
  
          ->save(new Video\WebM(), 'export-webm.webm');

  This is the error :

  Unable to probe C :\Users\KAZMI\AppData\Local\Temp\php4155.tmp

  ffprobe failed to execute command "C :/FFmpeg/bin/ffprobe.exe" C :\Users\KAZMI\AppData\Local\Temp\php4155.tmp -show_streams -print_format json

  and this is the input data :

  array:4 [  "video" => "video_7192228.webm"  "url" => "blob:http://localhost:8080/c319e0bf-7217-4916-90b6-c9cba800b7da"  "blob" => UploadedFile {#421    -test: false    -originalName: "blob"    -mimeType: "video/webm"    -size: 0    -error: 0    #hashName: null    path: "C:\Users\KAZMI\AppData\Local\Temp"    filename: "php8B7D.tmp"    basename: "php8B7D.tmp"    pathname: "C:\Users\KAZMI\AppData\Local\Temp\php8B7D.tmp"    extension: "tmp"    realPath: "C:\Users\KAZMI\AppData\Local\Temp\php8B7D.tmp"    aTime: 2017-10-14 14:20:24    mTime: 2017-10-14 14:20:24    cTime: 2017-10-14 14:20:24    inode: 0    size: 0    perms: 0100666    owner: 0    group: 0    type: "file"    writable: true    readable: true    executable: false    file: true    dir: false    link: false    linkTarget: "C:\Users\KAZMI\AppData\Local\Temp\php8B7D.tmp"  }  "file" => UploadedFile {#421}]