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Settings effecting video quality

Default call rate

The quality of the image will depend upon the bandwidth of the call as this limits the resolution of the

images that will be sent and received. Generally from a system running TC software in order to have a call

achieve 720p (HD) quality the call rate should be above 1152 kbps with 30 frame per second and 2560

kbps for 60 frame per second (if your codec supports 60fps). The quality you receive or send can be

limited by the equipment you are calling at the far end site (see "interoperability issues" on page 9).

Below are the minimum call rates you need in order that the system can achieve certain resolutions.

The higher the bandwidth the greater the quality of the call should be.

Minimum Call Rates Needed for Various Resolutions

Frame

rate

256 kbps

512 kbps

768 kbps

30 fps

512 x 288

768 x 448

1024 x 576

60 fps

256 x 144

512 x 288

The default call rate can be set under

Configuration -> System Configuration -> Conference 1 -> Default

Call ->

Rate. You can change the call rate from the default when placing calls, if a different rate is required.

Video protocol

if the image quality is not what you expect, you can check that the video being transmitted/received

using the H.264 video codec. it uses the bandwidth more efficiently and therefore the quality will be

higher for a given bandwidth than when using a H.263 or H.261 video codec. You can check this in a

call under the Call Status screen on the Touch panel and the System Information page using the remote

control. On the web interface you can find this navigating to

and press the triangle symbol to expand the call detail. To see how to access these screens, please

see the next section – Network related issues.

if the video is not being transmitted as H.264, check that the far-end system supports H.264.

Selecting when to use 60fps over 30fps

For each video input, this setting tells the system the lowest resolution where it should transmit 60fps.

For all resolutions lower than this, the maximum transmitted framerate would be 30fps, while above

this resolution 60fps would also be possible, if the available bandwidth is adequate.

To select when to use 60 fps rather than 30fps you can change the resolution under

System Configuration -> Video -> Input -> Source 1 -> Optimal Definition

For example if this is set to 1280_720 with a system that is not capable of 1080p 60fps (see next section)

then from 1152 kbps you will get 1280x720 at 30fps. With a bandwidth of 2560 kbps and above, the

resolution transmitted will be 1280x720 at 60fps, rather than 1920x1080 at 30fps. You cannot get a

resolution of 1920x1080p in this case even at maximum call rate.

D15029.01 Troubleshooting Guide TC6.0, April 2013.

Call rate

1152 kbps

2560 kbps

6000 kbps

1280 x 720

1920 x 1080

768 x 448

1280 x 720

1920 x 1080

Call Control -> Call Control -> Participants

Configuration ->

->Threshhold60fps.

if set to 1280_720 with a system that is 1080p 60 fps compatible then you will get 1280 x 720 at 30fps

at 1152 kbps, from 2560 kbps 1280 x 720 at 60 fps and from 6000 kbps 1920 x 1080 at 60fps. See

the table under Optimal Definition profile section for various resolutions and frame-rates supported.

Hardware support for 1080p 60fps for C60 and C90

New to TC6 is the support for 1080 at 60 frames per second (previously 60fps was only available at

lower resolutions) for C Series C60 and C90. Not all hardware is compatible with this. You can see if

your system is 60fps capable from the Home section of the web interface under General. if it is not

listed there, your system does not support 60fps.

To see if your system is capable of achieving this, please read the section 1080p60 support for SX20,

newer C60s and C90s in the

Release Notes for

endpoint/software/tc6/release_notes/tc_software_release_notes_tc6.pdf

Optimal Definition Profile

Typical resolutions used for different optimal definition profiles, call rates and frame rates

Optimal

Frame

Definition

rate

Profile

256 kbps

768 kbps

Normal

512 × 288

1024 × 576

30 fps

Medium

640 × 368

1280 × 720

High

768 × 448

1280 × 720

Normal

256 × 144

512 × 288

60 fps

Medium

256 × 144

768 × 448

High

512 × 288

1024 × 576

This setting controls at what bandwidth certain resolutions are transmitted (see table below). it is

recommended to set this to normal. if you have a dedicated video room with very good lighting condi-

tions, you can increase the profile to medium (or high in exceptional conditions) to transfer at a higher

resolution for a lower bandwidth.

Troubleshooting Guide TC6.0

TC6.0:

http://www.cisco.com/en/US/docs/telepresence/

Call rate

1152 kbps 1472 kbps 2560 kbps

4 Mbps

1280 × 720

1280 × 720 1920 × 1080 1920 × 1080 1920 × 1080

1280 × 720

1280 × 720 1920 × 1080 1920 × 1080 1920 × 1080

1280 × 720 1920 × 1080 1920 × 1080 1920 × 1080 1920 × 1080

768 × 448

1024 × 576

1280 × 720

1280 × 720 1920 × 1080

1024 × 576

1280 × 720 1920 × 1080 1920 × 1080

1280 × 720

1280 × 720 1920 × 1080 1920 × 1080 1920 × 1080

6 Mbps