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Sur d’autres sites (5869)

  • create bar type wave forms using ffmpeg

    8 juillet 2016, par Ashish Joshi

    i am trying to create wave forms from mp3 using ffmpeg.
    i have successfully created waveforms like below

    enter image description here

    now i am having troubles with generating like below sample image...

    enter image description here

    the code i am using to generate vertical line is provided below...

    while (!feof($handle) && $data_point < $data_size) {
               if ($data_point++ % DETAIL == 0) {
                   $bytes = array();

                   // get number of bytes depending on bitrate
                   for ($i = 0; $i < $byte; $i++) {
                       $bytes[$i] = fgetc($handle);
                   }

                   switch ($byte) {
                   // get value for 8-bit wav
                   case 1:
                       $data = findValues($bytes[0], $bytes[1]);
                       break;
                   // get value for 16-bit wav
                   case 2:
                       if (ord($bytes[1]) & 128) {
                           $temp = 0;
                       } else {
                           $temp = 128;
                       }

                       $temp = chr((ord($bytes[1]) & 100) + $temp);
                       $data = floor(findValues($bytes[0], $temp) / 256);
                       break;
                   }

                   // skip bytes for memory optimization
                   fseek($handle, $ratio, SEEK_CUR);

                   // draw this data point
                   // relative value based on height of image being generated
                   // data values can range between 0 and 255
                   $v = (int) ($data / 255 * $height);

                   // don't print flat values on the canvas if not necessary
                   if (!($v / $height == 0.5 && !$draw_flat))
                   // draw the line on the image using the $v value and centering it vertically on the canvas
                   {
                       imageline($img,
                           // x1
                           (int) ($data_point / DETAIL),
                           // y1: height of the image minus $v as a percentage of the height for the wave amplitude
                           $height * $wav - $v,
                           // x2
                           (int) ($data_point / DETAIL),
                           // y2: same as y1, but from the bottom of the image
                           $height * $wav - ($height - $v), imagecolorallocate($img, $r, $g, $b));
                   }

                   imageline($img1,
                       // x1
                       (int) ($data_point / DETAIL),
                       // y1: height of the image minus $v as a percentage of the height for the wave amplitude
                       $height * $wav - $v,
                       // x2
                       (int) ($data_point / DETAIL),
                       // y2: same as y1, but from the bottom of the image
                       $height * $wav - ($height - $v), imagecolorallocate($img1, $r1, $g1, $b1));

               }

    any help is appreciated...

  • How to convert ogg or mp3 file in wav without using ffmpeg

    3 août 2023, par Maksim Palchevski

    I have problems with installing ffmpeg and ffprobe that's why I am looking for ways to avoid them

    


    I have tried to ask neurolinks and even looked in Internet, but it is might to be impossible to install ffmpeg on that os that i have (nix os). So, i have tried to avoid it, but haven't found any solutions. Here is my code :

    


    from pydub import AudioSegment
def convert_audio_to_wav(input_file, output_file):
    # Читаем аудиофайл с помощью pydub
    x = AudioSegment.from_file(input_file)
    x.export(output_file, format='wav') 


    


    And it returns an error :

    


    [Errno 2] No such file or directory: 'ffprobe'


    


  • ffmpeg convert 4K file to 1080p mp4 file

    16 septembre 2015, par Hüseyin GÖZE

    i’m using ffmpeg to converting video in windows service, when i’m trying to converting 4K video to 1080p ffmpeg returns error like this :

    libvo_aacenc Stream mapping : Stream #0:0 -> #0:0 (h264 (native) ->
    h264 (libx264)) Stream #0:2 -> #0:1 (ac3 (native) -> aac
    (libvo_aacenc)) Error while opening encoder for output stream #0:1 -
    maybe incorrect parameters such as bit_rate, rate, width or height

    my ffmpeg convert command like this :

    ffmpeg -i 4k2.mp4 -vf scale=1920:1080 -threads 3 4k2_1080.mp4

    what’s wrong with this ?