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INTRODUCTION ORBAN
MODEL
1010
STREAMING
Transport Protocols:
RTSP/RTP, HTTP/ICY SHOUTcast, HTTP/ICY Icecast2
RTP Payload Format:
ISMA (
audio/mpeg4-generic)
Stream Information:
Name and Description
Method: Unicast
RTP/TCP
(External RTSP Server)
Transmission:
Automatic Unicast – Announce – Session Description
Protocol (.sdp) file per stream generated and transferred to server
Multicast RTP/UDP
(Internal RTSP Server)
TTL:
255 default
Unicast HTTP/TCP
Packet Size
: 1450 bytes plus IP Header Bytes = Total < 1500 byte MTU
Connection Fallback:
Automatic Reconnection upon Connection Failure
Stream Information:
Stream Name and Description, all server supported metadata
Metadata Input:
Text File, Serial, Ethernet, Nullsoft Winamp
Server Requirements:
Free Darwin Streaming Server 5.0 and later, QuickTime Streaming
Server 5.0 and later, Nullsoft SHOUTcast DNAS 1.9.4 and later, Icecast2 2.0.2 and later
Server Platform:
Available for Microsoft Windows 2000 Professional/Server, Windows 2003
Server, Windows XP Professional, Apple Mac OS X 10.2.8 and later Server and Proxy,
Red Hat Linux 9, FreeBSD, Sun Solaris 9
These specifications are subject to design improvements and changes
without notice.
Opticodec-PC TE, Test Edition is available upon request for testing en-
coder/server connectivity. With limited functionality, it allows testing
network connectivity and authentication to verify server configuration.
Applications
Putting your audio content on the Internet or your LAN can be divided into three
main steps: preprocessing the audio signal, encoding it, and streaming it to the net-
work.
High quality streams begin with the cleanest possible audio source material. For best
results, all material should be sourced in digital form to prevent any potential distor-
tion from occurring in the analog-to-digital conversion process. CDs should be digi-
tally extracted (ripped) to a PCM audio format if the digital storage system allows
this, or to a 384 kbps or higher MPEG-1 Layer 2 format. Avoid Layer 3, as well as
other codecs. More information on this topic can be obtained from the Orban publi-
cation, “Maintaining Audio Quality in the Broadcast Facility,” available as a free
download from http://www.orban.com.
Preprocessing
For optimum sound, loudness, and peak control, you should digitally preprocess the
Internet audio signal to condition it prior to encoding. The appropriate preprocess-
ing has much in common with the preprocessing required for DAB, HD Radio™, CD
mastering, or digital satellite.
