Why File Type Fails To Show The Type If The File In A Video File ?

[The Code Queryer]

Php Gurus,

When I select a video mp4 file and get the File_Type to echo it then it echoes blank. Why is that ?

[Select]

$file_type = $_FILES["id_verification_video_file"]["type"];
echo "File Type: $file_type<br>";

The form I mentioning below incase you wondering whether I mispelled the item name.:

[Select]

<form METHOD="POST" ACTION="" enctype="multipart/form-data">
<fieldset>
<p align="left"><h3><?php $site_name ?> ID Video Verification Form</h3></p>
<div class="form-group">
<p align="left"<label>Video File: </label>
<input type="file" name="id_verification_video_file" id="id_verification_video_file" value="uploaded 'Id Verification Video File.'"></p>
</div>
</fieldset>
<p align="left"><button type="submit" class="btn btn-default" name="id_verification_video_file_submit">Submit!</button></p>
</form>

If I select a .php file then it manages to show the file type. Only shows blank on the mp4 file.