Aspect ratio for VCD/SVCD/DVD
There are four aspect ratios defined for the mpeg standard
If you want to create a VCD/SVCD/DVD and the aspect ratio of the
source video is not one of the four values permitted, you need to
change the aspect ratio of the source video otherwise the encoded video
There are two ways to change the aspect ratio of a movie: pad or
Imagine your source video is 576x288 (aspect ratio 2:1) and you want to
create a 16/9 NTSC DVD (720x480).
If you are padding the video you have to add 36 horizontal black
lines (576x324 aspect 16:9) and scale to 720x480.
If you are cropping the video you have to cut 64 vertical lines
(512x288 aspect 16:9) and scale to 720x480.
If you pad the video, all the original video will be visible on the
screen, but part of the screen will be black.
If you crop the video, the complete screen will be used for the video,
but you will loose the borders of the original video.
In encode2mpeg add:
if you intend to pad the source video, or add
if you intend to crop the
In order to rotate the image of the final mpeg stream add the option
to the command line. The different values of the argument do the
0 rotate clockwise and flip
this option will set automatically -mpegfixaspect
pad because the
ratio of a rotated image usually changes (4/3 -> 3/4). You can
specify crop adding -mpegfixaspect
crop. The option -rotate works only in Avi Mode and Mpeg Mode.
1 rotate clockwise
2 rotate counterclockwise
3 rotate counterclockwise and flip
TV overscan zone
On a TV, 5-10% of the edges of the image are not visible. If your movie
has some items close to the borders (subtitles, etc.), probably you
will not see them on a TV. The option
will shrink the
encoded image of n%. A value between 5 and 10 will let you see on a
TV the complete video image. This option will set -mpegfixaspect pad.
It is also possible the give a negative argument to -overscan. The
effect is a magnification of the video image (the content close to the
borders will be removed). In this case the option -mpegfixaspect crop
will be set.