Grandstream Networks GHP6 Series Administration Manual page 25

Preferred Video Codec
Enable Video FEC
Enable RFC5168 Support
Video FEC Mode
FEC Payload Type
Packetization Mode
H.264 Image Size
Use H.264 Constrained
Profiles
H.264 Profile Type
Video Bit Rate
Lists the available and enabled Video codecs for this account. Users can enable the specific video codecs by
moving them to the selected box and set them with a priority order from top to bottom. This configuration
will be included with the same preference order in the SIP SDP message.
When enabled, the video sender will temporarily allocate part of the bandwidth to one data channel to send
FEC data to system, thus to improve the video quality the receiver gets. Enabling this function will take up
part of bandwidth and reduce call rate.
The default setting is "Yes".
Enables/disables RFC5168 mechanism for video calls. RFC5168 allows SIP party to request the sender to
refresh its video frame in H.264, or refresh the full picture in VP8.
The default setting is "Yes".
If set to 0, FEC is not sent by separate port. If set 1, FEC is sent by separate port.
Default setting is 0.
Configures FEC payload type. The range is 96-126. Default setting is 120.
Set video packetization mode. If set to "Single NAL Unit Mode", the packetization mode will be negotiated
as single NAL unit mode when dial video calls, if the other party does not support the negotiation, then
single NAL unit mode will be used for video encoding by default. If set to "Non-Interleaved Mode", the
packetization mode will be negotiated as Non-interleaved mode when dial video calls, If the other party does
not support negotiation, then the Non-interleaved mode will be used for for video encoding by default; If set
to "Prefer Non-Interleaved Mode", the packetization mode will be negotiated as prefer Non-interleaved
mode when dial video calls, if the other party does not support the negotiation, then prefer Non-interleaved
mode will be used for video encoding by default.
Sets the H.264 image size. It can be selected from the dropdown list.
720P
● 720P
● 4CIF
● VGA
● CIF
● QVGA
● QCIF
Note: For some network environment, the default setting "720P" might be too high that causes no video or
video quality issue during video call. In this case, please change "H.264 Image Size" to "VGA" or "CIF"
and change "Video Bit Rate" to "384kbps" or lower. The default setting is 720P.
Configures that whether to set H.264 constrained profiles.
The default setting is "No".
Selects the H.264 profile type from the dropdown list.
● Baseline Profile
● Main Profile
● High Profile
● BP/MP/HP (Default Setting)
Note: Lower levels are easier to decode, but higher levels offer better compression. Usually, for the best
compression quality, choose "High Profile"; for playback on low-CPU machines or mobile devices, choose
"Baseline Profile". If "BP/MP/HP" is selected, all three profiles "Baseline Profile" "Main Profile" and
"High Profile" will be used for negotiation during video decoding to achieve the best result. This is usually
used in video conference when there is higher requirement on the video.
Configures the bit rate for video call. It can be selected from the dropdown list. The default setting is 2048
kbps. The valid range is from 32 – 2048 kbps.
Note: The video bit rate can be adjusted based on the network environment. Increasing the video bit rate
may improve video quality if the bandwidth is permitted. If the bandwidth is not permitted, the video quality
will decrease due to packet loss. For some network environment, the default setting "720P" might be too