Width and height not constrained to be even in computing scale factor

in transcoders/TranscoderAbstractionFactoryFfmpeg.inc in setAspectRatioOptions() a width and height are computed and passed into ffmpeg as scale=$width:$height. If either of these numbers is not even ffmpeg fails.

Solution is to put the following (or similar) before the place where scale=$width:$height is constructed (in case 'preserve' around like 697):

          if (($width % 2) == 1) {
            $width--;
          }
          if (($height % 2) == 1) {
            $height--;
          }