Ffmpeg captures the orientation of the video

Question

The video may contain meta-information about the orientation of the camera. For example, iPhone and other phones set this flag if you turn on the device. The problem is that some players read this information and rotate the video accordingly, while other players do not.

To fix this, the video must be rotated and the meta information must be set correctly.

Does ffmpeg provide a fix for this, or do I need to go in a complicated way ( Read rotation , rotate, set metadata)

Answer 1

I went hard:

$ffmpeg == "path/to/ffmpeg";
$output_file_full = "file/after/normal/conversion";

// get rotation of the video
ob_start();
passthru($ffmpeg . " -i " . $output_file_full . " 2>&1");
$duration_output = ob_get_contents();
ob_end_clean();

// rotate?
if (preg_match('/rotate *: (.*?)\n/', $duration_output, $matches))
{
    $rotation = $matches[1];
    if ($rotation == "90")
    {
        echo shell_exec($ffmpeg . ' -i ' . $output_file_full . ' -metadata:s:v:0 rotate=0 -vf "transpose=1" ' . $output_file_full . ".rot.mp4 2>&1") . "\n";
        echo shell_exec("mv $output_file_full.rot.mp4 $output_file_full") . "\n";
    }
    else if ($rotation == "180")
    {
        echo shell_exec($ffmpeg . ' -i ' . $output_file_full . ' -metadata:s:v:0 rotate=0 -vf "transpose=1" ' . $output_file_full . ".rot2.mp4 2>&1") . "\n";
        echo shell_exec($ffmpeg . ' -i ' . $output_file_full . '.rot2.mp4 -metadata:s:v:0 rotate=0 -vf "transpose=1" ' . $output_file_full . ".rot.mp4 2>&1") . "\n";
        echo shell_exec("mv $output_file_full.rot.mp4 $output_file_full") . "\n";
    }
    else if ($rotation == "270")
    {
        echo shell_exec($ffmpeg . ' -i ' . $output_file_full . ' -metadata:s:v:0 rotate=0 -vf "transpose=2" ' . $output_file_full . ".rot.mp4 2>&1") . "\n";
        echo shell_exec("mv $output_file_full.rot.mp4 $output_file_full") . "\n";
    }
}

I used some ugly temp files. Sorry.