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MPEG-4 encoder settings (main concept) 359
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 372) 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 374). 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 373) after a scene change.
MPEG-4 simple
If MPEG-4 H.264 cannot be played back on your device, use MPEG-4 Simple.
Note: We recommend that only advanced users make adjustments to the advanced
settings. You can use the technical specifications of your playback device to help
with this.