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User’s Manual v.13 QVidium

H.264 HD Video Codecs™

Technologies, Inc. Page 20 of 67

exceed this value. However, there may be a variation in output bit rate of up to about 5% over

the value you set.

Video Encoding: You can select primarily between H.264 encoding (selectable profile and level,

High Profile by default) and MPEG2 (Main profile). H.264 requires about ½ to 1/3 of the bitrate

for comparable video quality versus MPEG2. You can also select Constant Quantization

versions of these two encoding mechanisms, that attempts to keep the video bitrate more

constant.

Audio Bitrate: This sets the total bitrate for the combination of the 2 audio channels (left and right

channels of a single audio pair). (The default of 160Kbps actually produces the same TS

Stream Bit Rate as setting the audio bit rate to 128Kbps because of size constraints for audio

packet sizes that must fit within a fixed TS packet size.)

Audio Encoding: You can select among MPEG1/Layer2, MPEG2 AAC, AC3 Pass-though on

SDI and AC3 Pass-through on Optical audio encoding formats. For speech and verbal

content, and to maintain the highest level of 3

party compatibility, we recommend the default

of MPEG1/Layer 2. For high fidelity audio, such as music or concerts, we recommend MPEG2

AAC. In addition, the QVENC and QVDEC support Dolby® Digital (also known as AC3) pass-

through operation selectable via either an external S/PDIF connector or embedded SDI audio.

AC3 provides Surround Sound 5.1 audio (5 channels plus one subwoofer channel).

Audio Sampling Rate: The default is a 48KHz audio sampling rate. For SDI I/O, 48KHz is

required as part of the SMPTE 259M standard. We recommend keeping this default value

when using the SDI video input.

IP Transport: The QVPRO/QVENC offers 3 choices: ARQ, RTP, and UDP. ARQ and RTP all

output UDP/IP packets with RTP headers. UDP transport encapsulates the MPEG Transport

Stream as the UDP/IP packet payload without the RTP data header. With the EVOstream

license, the QVENC supports RTSP, RTMP (Flash Media), and HLS transport formats.

Destination IP or Multicast Address: By default, this field is left blank. In order to create a valid

encoder profile, you must supply at least one valid IP address. This can either be a unicast or

a multicast IP address. In ARQ mode for IP Transport, you can also supply up to 3 IP

addresses, separated only by commas (‘,’), no spaces.

UDP Port: Enter the UDP port for the output audio/video transport stream. The default is 10000. If

the decoder is behind a firewall, you must open the firewall to port-forward packets on this port

to the internal IP address of the decoder.

ARQ Port: The default is 10000. If you are using ARQ, we recommend keeping this value the

same as the UDP port. This is the port that the ARQ error correction uses for sending

upstream (from the decoder to the encoder) missing-packet re-send requests to the encoder.

By using the same port as the outgoing UDP port, it allows you to not have to worry about

configuring port forwarding for any firewalls on the encoder-side of the network.

Note: Please remember to always hit the SAVE button after making any changes or your

changes will be lost. You must also restart the encoder with the updated profile for

these changes to take effect.

3.4 Configuring Encoder Format and Bitrates

The QVidium H.264 HD Video Codec™ includes a video scalar on the input and can encode all

standard broadcast resolutions as either MPEG4-AVC (H.264) or MPEG2. It can scale a high

definition (HD) video input to standard definition (SD), or can encode HD video up to 1080p60