Added additional media properties to the images table, video, audio, length, and lossless.

Added new event to handle fetching media properties like height, width, and the newly added fields, and admin controls to manually scan files for their properties.
Added a search terms content:video and content:audio to search for images that do (or do not) have those flags.

ext/transcode/theme.php

@@ -10,8 +10,10 @@ class TranscodeImageTheme extends Themelet
         global $config;
 
         $html = "
-			".make_form(make_link("transcode/{$image->id}"), 'POST')."
+			".make_form(make_link("transcode/{$image->id}"), 'POST', false, "",
+                "return transcodeSubmit()")."
                 <input type='hidden' name='image_id' value='{$image->id}'>
+                <input type='hidden' id='image_lossless' name='image_lossless' value='{$image->lossless}'>
                 ".$this->get_transcode_picker_html($options)."
 				<br><input id='transcodebutton' type='submit' value='Transcode'>
 			</form>