<s>
This	O
is	O
a	O
listing	O
of	O
open-source	B-License
codecs	B-General_Concept
—	O
that	O
is	O
,	O
open-source	B-Application
software	I-Application
implementations	O
of	O
audio	O
or	O
video	B-Algorithm
coding	I-Algorithm
formats	I-Algorithm
.	O
</s>
<s>
Many	O
of	O
the	O
codecs	B-General_Concept
listed	O
implement	O
media	O
formats	O
that	O
are	O
restricted	O
by	O
patents	O
and	O
are	O
hence	O
not	O
open	O
formats	O
.	O
</s>
<s>
For	O
example	O
,	O
x264	B-Language
is	O
a	O
widely	O
used	O
open	B-License
source	I-License
implementation	O
of	O
the	O
heavily	O
patent	O
encumbered	O
MPEG-4	B-Application
AVC	I-Application
video	B-Algorithm
compression	I-Algorithm
standard	I-Algorithm
.	O
</s>
<s>
x264	B-Language
–	O
H.264/MPEG	B-Application
-4	I-Application
AVC	I-Application
implementation	O
.	O
</s>
<s>
x264	B-Language
is	O
not	O
a	O
codec	B-General_Concept
(	O
encoder/decoder	B-General_Concept
)	O
;	O
it	O
is	O
just	O
an	O
encoder	O
(	O
it	O
cannot	O
decode	O
video	O
)	O
.	O
</s>
<s>
OpenVVC	O
an	O
VVC	B-Algorithm
/H.266	I-Algorithm
Real	O
Time-Decoder	O
for	O
Mac	B-Application
OS	I-Application
,	O
Windows	B-Application
,	O
Linux	B-Application
and	O
Android	B-Application
and	O
special	O
Version	O
of	O
FFmpeg	B-Library
,	O
which	O
was	O
used	O
for	O
Ateme	O
Satellite	B-Application
Broadcast	B-Operating_System
Test	O
.	O
</s>
<s>
x265	B-Language
–	O
An	O
encoder	O
based	O
on	O
the	O
High	B-Algorithm
Efficiency	I-Algorithm
Video	I-Algorithm
Coding	I-Algorithm
(	O
HEVC/H.265	O
)	O
standard	O
.	O
</s>
<s>
libvpx	B-Language
–	O
VP8	B-Algorithm
and	O
VP9	B-Algorithm
implementation	O
;	O
formerly	O
a	O
proprietary	O
codec	B-General_Concept
developed	O
by	O
On2	B-Application
Technologies	I-Application
,	O
released	O
by	O
Google	B-Application
under	O
a	O
BSD-like	O
license	O
in	O
May	O
2010	O
.	O
</s>
<s>
SVT-AV1	O
-	O
An	O
AV1	B-Application
encoder	O
originally	O
developed	O
by	O
Intel	O
and	O
Netflix	O
,	O
which	O
is	O
available	O
as	O
FLOSS	B-License
now	O
.	O
</s>
<s>
SVT-AV1	O
is	O
generally	O
considered	O
to	O
be	O
the	O
most	O
optimized	O
and	O
fastest	O
free	O
AV1	B-Application
encoder	O
,	O
which	O
is	O
why	O
it	O
serves	O
as	O
the	O
base	O
for	O
the	O
development	O
of	O
new	O
,	O
free	O
,	O
general-purpose	O
and	O
production-ready	O
implementations	O
in	O
the	O
AOMedia	O
Software	O
Implementation	O
Working	O
Group	O
.	O
</s>
<s>
While	O
SVT-AV1	O
already	O
performs	O
very	O
well	O
in	O
constrained	O
quality	O
mode	O
and	O
is	O
economically	O
usable	O
for	O
many	O
scenarios	O
,	O
as	O
of	O
the	O
time	O
being	O
commercial	O
implementations	O
like	O
Aurora1	O
may	O
still	O
beat	O
it	O
.	O
</s>
<s>
xvc	O
-	O
An	O
open	B-License
source	I-License
video	B-Application
codec	I-Application
,	O
aiming	O
to	O
compete	O
with	O
h.265	B-Algorithm
and	O
AV1	B-Application
.	O
</s>
<s>
FFmpeg	B-Library
codecs	B-General_Concept
–	O
Codecs	B-General_Concept
in	O
the	O
libavcodec	B-Language
library	O
from	O
the	O
FFmpeg	B-Library
project	O
(	O
FFV1	B-Algorithm
,	O
Snow	B-Library
,	O
MPEG-1	O
,	O
MPEG-2	O
,	O
MPEG-4	B-Application
part	I-Application
2	I-Application
,	O
MSMPEG-4	O
,	O
WMV2	O
,	O
SVQ1	O
,	O
MJPEG	O
,	O
HuffYUV	B-Algorithm
and	O
others	O
)	O
.	O
</s>
<s>
Decoders	O
in	O
the	O
libavcodec	B-Language
(	O
H.264	B-Application
,	O
SVQ3	O
,	O
WMV3	O
,	O
VP3	B-Algorithm
,	O
Theora	B-Algorithm
,	O
Indeo	O
,	O
Dirac	B-Application
,	O
Lagarith	B-Algorithm
and	O
others	O
)	O
.	O
</s>
<s>
Lagarith	B-Algorithm
–	O
Video	B-Application
codec	I-Application
designed	O
for	O
strong	O
lossless	B-Algorithm
compression	I-Algorithm
in	O
RGB(A )	O
colorspace	O
(	O
similar	O
to	O
ZIP/RAR/etc	O
.	O
)	O
</s>
<s>
Dirac	B-Application
as	O
dirac-research	O
,	O
a	O
wavelet	O
based	O
codec	B-General_Concept
created	O
by	O
the	O
BBC	B-Application
Research	I-Application
,	O
and	O
Schrödinger	O
,	O
an	O
implementation	O
developed	O
by	O
David	O
Schleef	O
.	O
</s>
<s>
Daala	B-Application
–	O
Experimental	O
Video	B-Application
codec	I-Application
which	O
was	O
under	O
development	O
by	O
the	O
Xiph.Org	B-Application
Foundation	I-Application
and	O
finally	O
merged	O
into	O
AV1	B-Application
.	O
</s>
<s>
Thor	B-Algorithm
–	O
Experimental	O
royalty	O
free	O
video	B-Application
codec	I-Application
which	O
was	O
under	O
development	O
by	O
Cisco	O
Systems	O
,	O
and	O
merged	O
technologies	O
into	O
AV1	B-Application
.	O
</s>
<s>
Turing	O
-	O
A	O
High	B-Algorithm
Efficiency	I-Algorithm
Video	I-Algorithm
Coding	I-Algorithm
(	O
HEVC/H.265	O
)	O
encoder	O
implemented	O
by	O
BBC	B-Application
Research	I-Application
.	O
</s>
<s>
libaom	B-Language
–	O
Reference	O
implementation	O
for	O
the	O
royalty	O
free	O
AV1	B-Application
video	B-Algorithm
coding	I-Algorithm
format	I-Algorithm
by	O
AOMedia	O
,	O
inheriting	O
technologies	O
from	O
VP9	B-Algorithm
,	O
Daala	B-Application
and	O
Thor	B-Algorithm
.	O
</s>
<s>
Kvazaar	O
–	O
An	O
academic	O
open-source	B-License
encoder	O
based	O
on	O
the	O
High	B-Algorithm
Efficiency	I-Algorithm
Video	I-Algorithm
Coding	I-Algorithm
(	O
HEVC/H.265	O
)	O
standard	O
.	O
</s>
<s>
UVG266	O
academic	O
Open-Source	B-License
VVC/H.266	B-Algorithm
-Encoder	O
based	O
on	O
Kvazaar	O
.	O
</s>
<s>
VVenC	O
&	O
VVdeC	O
–	O
An	O
open-source	B-License
encoder	O
and	O
decoder	O
released	O
by	O
Fraunhofer	O
HHI	O
based	O
on	O
the	O
Versatile	B-Algorithm
Video	I-Algorithm
Coding	I-Algorithm
(	O
VVC/H.266	B-Algorithm
)	O
standard	O
available	O
on	O
GitHub	B-Application
.	O
</s>
<s>
REVC	O
–	O
a	O
Rust-based	O
MPEG-5	O
Part	O
1	O
:	O
Essential	B-Algorithm
Video	I-Algorithm
Coding	I-Algorithm
baseline	O
encoder	O
and	O
decoder	O
.	O
</s>
<s>
FLAC	B-Application
–	O
Lossless	B-Algorithm
codec	I-Algorithm
developed	O
by	O
Xiph.Org	B-Application
Foundation	I-Application
.	O
</s>
<s>
LAME	B-Algorithm
–	O
Lossy	O
compression	O
(	O
MP3	O
format	O
)	O
.	O
</s>
<s>
TooLAME/TwoLAME	O
–	O
Lossy	O
compression	O
(	O
MP2	O
format	O
)	O
.	O
</s>
<s>
Musepack	B-Algorithm
–	O
Lossy	O
compression	O
;	O
based	O
on	O
MP2	O
format	O
,	O
with	O
many	O
improvements	O
.	O
</s>
<s>
Speex	B-Application
–	O
Low	O
bitrate	O
compression	O
,	O
primarily	O
voice	O
;	O
developed	O
by	O
Xiph.Org	B-Application
Foundation	I-Application
.	O
</s>
<s>
Deprecated	O
in	O
favour	O
of	O
Opus	B-Algorithm
according	O
to	O
www.speex.org	O
.	O
</s>
<s>
libopus	B-Algorithm
–	O
A	O
reference	O
implementation	O
of	O
the	O
Opus	B-Algorithm
format	I-Algorithm
,	O
the	O
IETF	O
standards-track	O
successor	O
to	O
CELT	B-Algorithm
.	O
</s>
<s>
(	O
Opus	B-Algorithm
support	O
is	O
mandatory	O
for	O
WebRTC	B-Protocol
implementations	O
.	O
)	O
</s>
<s>
libvorbis	B-Algorithm
–	O
Lossy	O
compression	O
,	O
implementation	O
of	O
the	O
Vorbis	B-Algorithm
format	O
;	O
developed	O
by	O
Xiph.Org	B-Application
Foundation	I-Application
.	O
</s>
<s>
FFmpeg	B-Library
codecs	B-General_Concept
in	O
the	O
libavcodec	B-Language
library	O
,	O
e.g.	O
</s>
<s>
AC-3	O
,	O
AAC	O
,	O
ADPCM	O
,	O
PCM	O
,	O
Apple	B-Algorithm
Lossless	I-Algorithm
,	O
FLAC	B-Application
,	O
WMA	B-Application
,	O
Vorbis	B-Algorithm
,	O
MP2	O
,	O
etc	O
.	O
</s>
<s>
FAAD2	B-Operating_System
–	O
open-source	B-License
decoder	O
for	O
Advanced	B-Application
Audio	I-Application
Coding	I-Application
.	O
</s>
<s>
There	O
is	O
also	O
FAAC	B-Operating_System
,	O
the	O
same	O
project	O
's	O
encoder	O
,	O
but	O
it	O
is	O
proprietary	O
(	O
but	O
still	O
free	B-License
of	I-License
charge	I-License
)	O
.	O
</s>
