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Configuring the Camera
GOP Length [ms]
- If the Encoder Type parameter is set to H.264 or MPEG4, then the GOP Length
parameter will set the time between I-frames in milliseconds.
In an H.264 or an MPEG stream, the camera transmits periodic I-frames and transmits several
P-frames between each I-frame. I-frames carry complete information for a captured image.
P-frames only carry information about the areas of the image that have changed since the last
I-frame was transmitted. The time between the transmission of I-frames is determined by the GOP
Length parameter. Increasing the time between I-frames (i.e., the GOP length) will increase the
efficiency of the encoder. But be aware that increasing the GOP length also increases the latency
when you start an image stream because the decoder in the receiving device must wait longer for
the initial I-frames.
Live Buffer Size [kbyte]
buffer is a ring buffer that stores the last N captured images for the stream (N depends on the size
of the images being encoded and the size of the buffer).
Alarm Buffer Size [kbyte]
Normally, the alarm buffer is simply a ring buffer that stores the last N captured images for the
stream (N depends on the size of the images being encoded and the size of the buffer). But when
an alarm condition is declared, the alarm buffer will only continue to buffer post alarm images until
the portion of the buffer that is allocated for post alarm image storage is full (see the next
parameter). At that point, buffering will stop, and the pre and post alarm images held in the buffer
will be retained until a new Alarm Buffer Arm command is issued (see Section 3.6.2 on
Post Alarm Buffer Size [kbyte]
used for "post alarm" image storage. For example, if the Alarm Buffer Size parameter is set to 2048
kilobytes and the Post Alarm Buffer Size parameter is set to 1228 kilobytes, then 1228 kilobytes (i.e.,
60%) of the alarm buffer will be allocated for holding post alarm images.
Audio Encoder Type
the audio encoder type for the stream.
The audio data can be streamed via HTTP or RTSP together with MJPEG, MPEG-4, and H.264
encoded streams.
Off = Disables the audio functionality.
A-law = The selected stream is G.711 A-law encoded. The content type is "audio/PCMA".
µ-law = The selected stream is G.711 µ-law encoded. The content type is "audio/PCMU".
PCM Raw = The selected stream uses PCM Raw encoding. Audio data are sent as 16-bit PCM
data sampled with 16 kHz in network (big-endian) order. The content type is "audio/raw".
For more information about the audio settings, see Section 3.11 on
Text Overlay
- Click the Text Overlay button to open the Text Overlay dialog box as shown below.
The dialog box contains two tabs, Text Overlay 1 and Text Overlay 2, that let you define two different
sets of text to appear in a bar at the top or the bottom of each image transmitted in the stream. The
two tabs are identical and, therefore, the options described below apply to both.
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- Sets the size (in kilobytes) of the live buffer for the stream. The live
- Sets the size (in kilobytes) of the alarm buffer for the stream.
- Sets the portion of the alarm buffer (in kilobytes) that will be
- Enables or disables the audio functionality for the selected stream and sets
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