The transmission characteristics are defined in the VideoEncoder. To access the configuration, the Edit Mode must first be activated in the VideoSwitch panel.

In the VideoEncderCONFIGURATION menu , select the Configuration option. A window with three options will appear: ENCODER, VIDEO and AUDIO.


Encoder

Video and audioencoding parameters.

VIDEO ENCODING

Encoder: codec used. By default h264

Maximum Bitrate: Average bit rate (kb/sec) for streaming video. Video encoding is constant bitrate (CBR).

If you have high upload speed, please note that viewers will require an equivalent download speed to be able to watch the stream. Recommended: 70% -80% of upload speed. It is not recommended to exceed 3500kbps.

AUDIO CODING

Bitrate: Determines the bitrate for audio, in kb/s. Lower values sacrifice quality to reduce the bandwidth used, while higher values offer higher audio quality at the expense of higher bandwidth. Consider the video bitrate when setting the audio bitrate.

Video

Allows you to scale the video resolution to adapt the system to the available hardware resources. The default value is HD 1280x720.

Audio

Allows you to define the audio input of the system that will be used for transmission. This audio input receives the signal from the transmitting console.

A second backup audio input can be defined, to be used in case of no signal at the main input.

The Audio Sync field applies a delay to the audio (in milliseconds) to compensate for the latency of the video signal.


Optimize fluidity of movement in the image

It is very important to maintain the same frame rate throughout the video chain, to optimize the fluidity of movement. It is recommended to work in 30 frames per second, due to the fact that most computer monitors use working frequencies of 60 Hz, and since the video flow is divisible by the working frequency of the screen, the displacements are shown with the original fluidity. To obtain better system performance and a better image, take into account the following observations:

  1. In order for the news socket and/or any other text or animated element to scroll smoothly on screen, it is necessary that the scroll speed field be a multiple of the transmission frame rate. For example, values of 30 and 60 in speed will give a homogeneous scrolling if the transmission is done at 30fps.
  2. Video loops used in the Playout system to fill the image when playing an audio file should be generated at the same frame rate as the streaming transmission (30fps).
  3. All video sources configured in CLOSE RadioTV should have the same frame rate as the output stream (30 fps), for the smoothest motion. In the case of USB cameras, this is defined when configuring the source. The same is true for HD-SDI/HDMI sources connected via a Blackmagic digitizer card. For proprietary IP cameras, it is also recommended to set them to 30fps.
  4. If you are going to use a video monitor in projector mode to display the video in the Studio, configure it in Windows to work at a multiple of the frame rate. In the case of 30 fps the most advisable multiple is 60 fps.