User manual

MPEG-4 encoder settings 147
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• 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 130) length. High values
mean improved compression. Lower values create stronger security
protection and enable improved access to individual frames for
processing the video.
Max b-frames count
The maximum number of b-frames (view page 132). 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 131) after a scene
change.
Input info
Information about the incoming video stream is displayed here during
live recordings.
Statistics
Information about the encoder activity is displayed here during live
recordings.