| ascp4: Transferring from the Command Line with Ascp 4 | 155
The restriction can be set to allow all access (*) or limited by protocol, hostname or path:
Restriction Format Example
By protocol udp://*
tcp://*
By protocol and hostname udp://hostname*
By protocol, hostname, and port tcp://hostname:5000*
General Command Line Usage
# ascp4 -m minimum_rate -l target_rate --mode=mode --host=remote_hostname
--compression=none --user=username --read-threads=1 --write-
threads=1 input_uri output_uri
• ascp4 streaming supports two transfer directions: send and recv.
• The ascp4 command defaults to multiple threads, but for reliable and in-order transport of streams you must use
only one read and write thread by specifying --read-threads=1 --write-threads=1.
• The data stream source and destination can be udp://, tcp://, or file://. For more information, see Built-
in I/O Providers on page 153
• For command line examples, see Ascp 4 Data Streaming Examples on page 156.
Recommended Rate Settings for Video Streams
ascp4 Option Description Recommendation
-m Minimum rate Take the encoding rate of the
transport stream and add 1 Mbps.
-l Target rate Take the minimum rate and add 10%
of the minimum rate.
For example, if the encoding rate is 10 Mbps, use the following settings:
# ascp4 -m 11M -l 13M ...
Multicast URI Syntax
The input multicast URI and the output multicast URI uses the same syntax.
multicast_protocol_scheme://stream_ip_address:port?option=value&option=value...
The multicast protocol scheme can be either udp or mcast. If the IP address of your data stream is a multicast
address, ascp4 uses multicast regardless of the protocol scheme (in other words, both udp and mcast use
multicast). In order to use unicast addresses, you must use the udp scheme.
You can configure properties of the stream by adding options to the URI after the question mark (?), each separated
by an ampersand (&). The following table describes the supported options.
Option Description Default
pktbatch={1|0} How to handle packet read and
write. If 1, batch read and write UDP
datagrams. If 0, read and write one
packet at a time.
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