Encoder Streams - Sony SNC-HMX70 User Manual

Expert Settings
If necessary, use the expert settings to adapt the I-frame
quality and the P-frame quality to specific requirements.
The setting is based on the H.264 quantization
parameter (QP).
GOP structure
Select the structure you require for the Group-of
-Pictures (GOP). Depending on whether you place
greater priority on having the lowest possible delay (IP
frames only) or using as little bandwidth possible, you
choose IP, IBP or IBBP. (GOP is not available on some
megapixel cameras.)
Averaging period
Select the appropriate averaging period as a means of
stabilizing the long term bit rate.
I-frame distance
Use the slider to set the distance between I-frames to
Auto or to between 3 and 60. An entry of 3 means that
every third image is an I-frame. The lower the number,
the more I-frames are generated.
Min. P-frame QP
In the H.264-protocol, the Quantization Parameter (QP)
specifies the degree of compression and thus the image
quality for every frame. The lower the QP value, the
higher the encoding quality. A higher quality produces a
higher data load. Typical QP values are between 18 and
30. Define the lower limit for the quantization of the
P-frames here, and thus the maximum achievable
quality of the P-frames.
I/P-frame delta QP
This parameter sets the ratio of the I-frame QP to the
P-frame QP. For example, you can set a lower value for
I-frames by moving the slide control to a negative value.
Thus, the quality of the I-frames relative to the P-frames
is improved. The total data load will increase, but only
by the portion of I-frames.
To obtain the highest quality at the lowest bandwidth,
even in the case of increased movement in the picture,
configure the quality settings as follows:
1
Observe the coverage area during normal
movement in the preview images.
2
Set the value for Min. P-frame QP to the highest
value at which the image quality still meets your
needs.
3
Set the value for I/P-frame delta QP to the lowest
possible value. This is how to save bandwidth and
memory in normal scenes. The image quality is
retained even in the case of increased movement
since the bandwidth is then filled up to the value
that is entered under Maximum bit rate.
Background delta QP
Select the appropriate encoding quality level for a
background region defined in Encoder Regions. The
lower the QP value, the higher the encoding quality.
Object delta QP
Select the appropriate encoding quality level for an
object region defined in Encoder Regions. The lower the
QP value, the higher the encoding quality.
Default
Click Default to return the profile to the factory default
values.

Encoder Streams

Video channel
Three video channels are available. Click a tab to set up
the streams for a particular channel.
The video 2 channel also allows you to select a Dewarp
mode.
H.264 settings
Select H.264 Settings
1
Select a codec algorithm Property for stream 1
from the drop-down box.
2
Select the Non-recording profile for stream 1 from
the eight profiles that have been defined.
This profile is not used for recording. When a
stream is used for recording, the profile selected on
the Recording Profiles page is used.
3
Select a codec algorithm Property for stream 2 (the
available choices depend on the algorithm selected
for stream 1).
4
Select the Non-recording profile for stream 2 from
the eight profiles that have been defined.
This profile is not used for recording. When a
stream is used for recording, the profile selected on
the Recording Profiles page is used.
JPEG stream
Set the parameters for the M-JPEG stream.
– Select the Resolution.
– Select the Max. frame rate in images per second
(ips).
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