how to check if video is landscape or portrait usi

2019-09-21 09:52发布

I have to check the video is landscape or portrait before rotate using ffmpge . please help me.

回答1:

using ffmpeg we cant check the video is taken landscape mode or portrite mode in iphone.

we need to install mediainfo or exiftool

if we install exiftool use the below commands

exec('exiftool path/to/filename/ | grep Rotation');

from this we can get the rotation of the videos

if rotation is 90° the videos taken in portraite mode in iphone

if rotation is 0° the videos taken in landscape mode in iphone

回答2:

Getting video dimension from ffmpeg -i

Get info.
Extract dimensions.
If x < y, then portrait. Else landscape.

eg:

$output = shell_exec("ffmpeg -i $myvideo");
$out_arr = explode("\n", $output);
foreach($out_arr as $line) {
  if( preg_match('/^Stream.*Video:/', trim($line)) ) {
    // match line: Stream #0.0(und): Video: h264 (High), yuv420p, 640x360 [PAR 1:1 DAR 16:9], 597 kb/s, 25 fps, 25 tbr, 25k tbn, 50 tbc
    $line_arr = explode(',', $line);
    // get field: 640x360 [PAR 1:1 DAR 16:9]
    $target_arr = explode(' ', $line_arr[2]);
    // get parts: 640x360
    $dims = explode('x', $target_arr[0]);
    $res_x = $dims[0];
    $res_y = $dims[1];
  }
}

if( !( isset($res_x) && isset($res_y) ) ) {
  die('Could not get dimensions');
} else {
  $orientation = ($res_x < $res_y) ? 'Portrait' : 'Landscape';
  printf('Resolution: %s x %s\nOrientation: %s\n', $res_x, $res_y, $oreintation);

I don't know why you'd want to rotate the video from how it was shot, though. You're going to end up with sideways videos after rotating more likely than not.