Item
Description
4CIF
704x576
704x480
2CIF
720x288
720x240
CIF (top field only)
352x288
352x240
QCIF
176x144
176x120
In addition, VGA (640x480) and QVGA (320x240) are also supported.
For more information on CIF resolutions, see "Notes" later in this
chapter.
Note: The BC840-MC will simultaneously handle dual H.264 encoding
and dual MPEG-2/4 encoding at full frame rate, and Live View
encoding at 5 frames per second. Setting Encoders 3 and 4 to
perform MPEG-2/4 encoding in D1 resolution at the same time may
overtax the hardware. The total output bandwidth, including streams
controlled by RTSP, and those enabled through SAP, should not
exceed 25 Mb/s.
GOP length
Distance in frames between two I-frames.
Frame rate
PAL: 1-25 fps; NTSC: 1-30 fps. Selectable rates are determined by the
video mode (PAL, NTSC) set on the Image tab.
Bit rate
Range: [10…15000]. Selecting a profile (see below), automatically sets
the bit rate associated with the profile.
Profile
Preset combinations of settings for specific purposes. When a profile
has been selected, changing one of its defined parameters sets the
Profile box to '--', to indicate that a custom profile has been
configured. When a freely chosen parameter value combination
matches a preset profile, the name of the profile shows in the Profile
box.
Show Preview>>
Click to view live images and see the effect of the current settings.
<<Hide Preview
Closes the preview. This may improve webpage responsiveness.
Volume
Move the slider to control audio volume.
Mute
Select/clear this box to mute/unmute audio.
11.5.1.1
Combinations of settings
Set sensible combinations of video bit rate mode, resolution, GOP length, and frame and bit
rates. When setting and saving these values, you may notice that inappropriate value
combinations are ‘corrected’ by automatic selection of the closest suitable combination. The
output bit rate set may range from 10-15000 kbps. The total output bandwidth should not
exceed 25 Mb/s.
Video
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