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Aspect ratio
In the film industry, this is an indication of the ratio between width and height of a
rectangle, monitor, or screen.
There are 3 different sizes available:
• Picture Aspect Ratio (also Display Aspect Ratio, DAR): This indicates the desired
aspect ratio of the video to be exported. Here are some examples of typical
aspect ratios: at home 4:3, 16:9 (typical for TV sets) or 16:10 (widescreen-
flatscreens, widescreen notebooks), 3:2 for 35mm films and photos. In cinemas
you mostly find 1.85:1.
• Pixel Aspect Ratio (PAR, pixel aspect ratio: Indicates the aspect ratio of individual
pixels. The majority of computer monitors have quadratic pixels (PAR=1:1), for
analog television monitors (PAL at 4:3) 128:117.
• Sample Aspect Ratio (SAR, also Storage Aspect Ratio): Aspect ratio of the saved
resolution (number of pixels), e.g. 720:576 at PAL. It also calculates picture
aspect ratio and pixel aspect ratio: SAR = DAR / PAR.
Note: In the standard case, the "Aspect ratio" remains set the way it is. You should
only change the settings if the resulting video is exported distorted or stretched or if
you need to correct the video because it is in the wrong aspect ratio.
GOP structure
Max GOP length
Determines the maximum GOP (view page 359) length. High values mean improved
compression. Lower values create stronger security protection and enable improved
access to individual frames for processing the vide
o.
Max b-frames count
The maximum number of b-frames (view page 361). Several cases of application, e.g.
video conferences require "no b-frames" in order to achieve the shortest possible
reaction times during transfer.
Scene change detection
If this option is activated the scenes will be detected during encoding, thus allowing
you to insert an I frame (view page 359) after a scene change.
MPEG-4 simple
If MPEG-4 H.264 cannot be played back on your device, use MPEG-4 Simple.