Wrong video aspect ratio

Attached file original size is 256x240
Target dimension is 1280x720
Aspect mode is 'preserve'

Result size is 86x720

Expected Result size is 768x720

To fix this issue I make small fix

--- a/transcoders/TranscoderAbstractionFactoryFfmpeg.inc
+++ b/transcoders/TranscoderAbstractionFactoryFfmpeg.inc

@@ -688,7 +688,7 @@
           $height = $sourcedimensions[1] * $factor;
         }
         else {
-          $factor = $targetdimensions[1] < $sourcedimensions[1] ? $targetdimensions[1] / $sourcedimensions[1] : $sourcedimensions[1] / $targetdimensions[1];
+          $factor = $targetdimensions[1] > $sourcedimensions[1] ? $targetdimensions[1] / $sourcedimensions[1] : $sourcedimensions[1] / $targetdimensions[1];
           $width = $sourcedimensions[0] * $factor;
           $height = $targetdimensions[1];
         }

Please validate