Encoder settings: Depending on whether an H264 or a JPEG encoder is used, one of the following
menus will appear:
• H264 encoder settings for the current image source:
H264 encoding uses a keyframe (I) followed by a number of predicted frames (P). The
frequency of I frames, compression rate and bitrate can be configured flexibly. These settings
may also adapt to the image content, for example to provide a higher quality stream in case of
an event (motion detected) and lower quality when only the background is visible. It is even
possible to limit this higher quality to the part of the image, which depicts the vehicle.
o I and P frames group size: The group size is the number of I frames plus the number of P
frames. For example, 1 keyframe + 15 predicted frames, the group size is 16.
o H264 compression: Default H264 compression. The larger this number the lower the quality,
but with a higher compression rate and vice versa.
o I-frame handler on event:
• Uses...: Uses I and P frames group size from above
• If new...: The first frame of an event (see below) will be an I frame, all others will be P frames
• All frames...: All frames will be I frames across the entire duration of the event
o H264 compression on event: During an event this quality will be used instead of H264
compression.
o Window compression on event: H264 compression in the event window (image area defined
by the event, e.g. where motion was detected).
o Average bitrate: Restrict average bitrate to this value.
o H264 compression delta: In order to achieve Average bitrate, the quality (H264 compression)
may possibly be reduced. This control limits the amount of this reduction.
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