<s>
Secure	B-Protocol
Reliable	I-Protocol
Transport	I-Protocol
(	O
SRT	O
)	O
is	O
an	O
open	O
source	O
video	O
transport	O
protocol	O
that	O
utilises	O
the	O
UDP	B-Protocol
transport	O
protocol	O
.	O
</s>
<s>
SRT	O
provides	O
connection	O
and	O
control	O
,	O
reliable	O
transmission	O
similar	O
to	O
TCP	B-Protocol
;	O
however	O
,	O
it	O
does	O
so	O
at	O
the	O
application	B-Application
layer	I-Application
,	O
using	O
UDP	B-Protocol
protocol	I-Protocol
as	O
an	O
underlying	O
transport	O
layer	O
.	O
</s>
<s>
SRT	O
also	O
supports	O
encryption	O
using	O
AES	B-Algorithm
.	O
</s>
<s>
The	O
protocol	O
was	O
derived	O
from	O
the	O
UDT	B-Language
project	I-Language
,	O
which	O
was	O
designed	O
for	O
fast	O
file	O
transmission	O
.	O
</s>
<s>
It	O
provided	O
the	O
reliability	O
mechanism	O
by	O
utilising	O
similar	O
methods	O
for	O
connection	O
,	O
sequence	B-Protocol
numbers	I-Protocol
,	O
acknowledgements	O
and	O
re-transmission	O
of	O
lost	O
packets	O
.	O
</s>
<s>
SRT	O
packets	O
are	O
created	O
at	O
the	O
application	B-Application
layer	I-Application
and	O
handed	O
to	O
the	O
transport	O
layer	O
for	O
delivery	O
.	O
</s>
<s>
Secure	B-Protocol
Reliable	I-Protocol
Transport	I-Protocol
is	O
an	O
open	O
source	O
video	O
transport	O
protocol	O
developed	O
originally	O
by	O
Haivision	O
.	O
</s>
<s>
SRT	O
supports	O
end-to-end	O
encryption	O
with	O
AES	B-Algorithm
.	O
</s>
<s>
The	O
reference	O
implementation	O
of	O
the	O
protocol	O
was	O
originally	O
published	O
under	O
the	O
Lesser	B-Application
General	I-Application
Public	I-Application
License	I-Application
version	O
2.1	O
,	O
but	O
was	O
relicensed	O
under	O
the	O
Mozilla	B-License
Public	I-License
License	I-License
on	O
22	O
March	O
2018	O
.	O
</s>
<s>
SRT	O
is	O
supported	O
in	O
the	O
free	B-Application
software	I-Application
multimedia	B-Library
frameworks	I-Library
GStreamer	B-Language
,	O
FFmpeg	B-Library
,	O
OBS	B-Language
Studio	I-Language
and	O
in	O
VLC	B-Application
free	B-Application
software	I-Application
media	O
player	O
.	O
</s>
<s>
The	O
UDP-based	B-Language
Data	I-Language
Transfer	I-Language
Protocol	I-Language
(	O
UDT	O
)	O
project	O
has	O
been	O
a	O
base	O
for	O
the	O
SRT	O
project	O
.	O
</s>
<s>
SRT	O
Alliance	O
is	O
an	O
organisation	O
whose	O
members	O
develop	O
,	O
use	O
and	O
promote	O
the	O
Secure	B-Protocol
Reliable	I-Protocol
Transport	I-Protocol
protocol	O
and	O
software	O
based	O
on	O
it	O
.	O
</s>
<s>
The	O
founding	O
members	O
of	O
the	O
alliance	O
are	O
Haivision	O
and	O
Wowza	B-Application
Streaming	I-Application
Engine	I-Application
.	O
</s>
<s>
The	O
API	O
is	O
very	O
similar	O
to	O
the	O
one	O
of	O
TCP	B-Protocol
.	O
</s>
<s>
The	O
optional	O
Forward	B-Error_Name
Error	I-Error_Name
Correction	I-Error_Name
mechanism	O
.	O
</s>
