Ut Video Codec Suite

{{Infobox software

| name = UT Video Codec Suite

| author = Takeshi Umezawa

| released = {{Start date and age|2008|04|18}}

| latest release version = 23.1.0

| latest release date = {{Start date and age|2023|4|23}}

| programming language = C++

| operating system = Windows, OS X

| size = 7.02 MB

| genre = Video Codec

| license = GPL

| website = {{URL|http://umezawa.dyndns.info/wordpress/}}

}}

UT Video Codec Suite is a fast, lossless video codec, developed by {{nihongo|Takeshi Umezawa|梅澤 威志|Umezawa Takeshi}} and released under the free GNU General Public License. The algorithm of UT video is based on the Huffman code.

UT video was developed as an alternative to HuffYUV, in order to achieve better compression. It can handle color spaces such as YUV422 (ULY2), RGB (ULRG), RGBA (ULRA) and, most recently, YUV420 (ULY0).

It has both x86 and x64 builds. Due to its multithreading support, this codec is also capable of encoding HDTV material in real time. The codec requires support for the SSE2 instruction set because it is heavily used for speed optimizations.{{cite web|url=https://trac.ffmpeg.org/ticket/534|title=#534 (Ut Video Support) – FFmpeg|work=ffmpeg.org|accessdate=March 22, 2017}}{{cite web|url=https://forum.doom9.org/showthread.php?t=143624|title=Ut Video Codec Suite - a new lossless video codec for Windows! - Doom9's Forum|work=doom9.org|accessdate=March 22, 2017}}

UT video uses the following FOURCC codes: ULY0, ULY2, ULRA, ULRG.{{cite web |url=https://www.free-codecs.com/download/ut_video_codec_suite.htm |title=Ut Video Codec Suite |author=free-codecs.com |date=12 Mar 2017 |website=free-codecs.com |publisher= |accessdate=March 22, 2017}}

It is used in the screen recording software OBS Studio when set to "Lossless" video quality.