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Description

Usage

$bool = getID3::CalculateCompressionRatioVideo();

Parameters

Returns

bool

Source

File name: wordpress/wp-includes/ID3/getid3.php
Lines:

  public function CalculateCompressionRatioVideo() {
    if (empty($this->info['video'])) {
      return false;
    }
    if (empty($this->info['video']['resolution_x']) || empty($this->info['video']['resolution_y'])) {
      return false;
    }
    if (empty($this->info['video']['bits_per_sample'])) {
      return false;
    }

    switch ($this->info['video']['dataformat']) {
      case 'bmp':
      case 'gif':
      case 'jpeg':
      case 'jpg':
      case 'png':
      case 'tiff':
        $FrameRate = 1;
        $PlaytimeSeconds = 1;
        $BitrateCompressed = $this->info['filesize'] * 8;
        break;

      default:
        if (!empty($this->info['video']['frame_rate'])) {
          $FrameRate = $this->info['video']['frame_rate'];
        } else {
          return false;
        }
        if (!empty($this->info['playtime_seconds'])) {
          $PlaytimeSeconds = $this->info['playtime_seconds'];
        } else {
          return false;
        }
        if (!empty($this->info['video']['bitrate'])) {
          $BitrateCompressed = $this->info['video']['bitrate'];
        } else {
          return false;
        }
        break;
    }
    $BitrateUncompressed = $this->info['video']['resolution_x'] * $this->info['video']['resolution_y'] * $this->info['video']['bits_per_sample'] * $FrameRate;

    $this->info['video']['compression_ratio'] = $BitrateCompressed / $BitrateUncompressed;
    return true;
  }
 

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