User manual

MPEG-4 encoder settings 141
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VBV buf. size
VBV is the abbreviation for "Video rate buffer verifier definition" and
the size of the buffer (storage area) that is applied to the encoding.
The larger the buffer is, the better the results will be, but the
processing will also take much longer. The smaller the buffer is, the
more parallel processing can take place at the same time in RAM.
Pixel aspect ratio
Specifies the page ratio of the individual image points (pixels).
Meaning: Different television norms and the standard pixel ratio.
Select a setting and the results are displayed as "X" and "Y".
X/Y: The actual pixel ratio. If under "Meaning" the setting "Custom" is
selected, then a custom ratio can be set.
GOP structure
Max key interval
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.
B-frames count
The number of B-Frames (view page 132). Several applications, e.g.
video conferences, require a setting of "0" for this, i.e. no B-Frames,
in order to enable the shortest possible reaction times for 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.