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The Scalable Video Technology for AV1 (SVT-AV1 Encoder and Decoder) is an AV1-compliant encoder/decoder library core. The SVT-AV1 encoder development is a work-in-progress targeting performance levels applicable to both VOD and Live encoding / transcoding video applications. The SVT-AV1 decoder implementation is targeting future codec research activities. Command line software.
Free software
OS:
File size: 1MB
Version history
OS:
File size: 1MB
Version history
Screenshots
Latest version
Download
Download SVT-AV1 4.2 1MB Win
Software License
Supported operating systems
Version history / Release notes / Changelog / What's New
## [4.2.0] - 2026-07-14
VOD / Random Access
- Added TUNE-VMAF mode targeting ~15% VMAF BD-rate improvement at minimal PSNR loss
- Implemented single-thread processing mode with RA handling
- RA preset tuning and bitrate optimization for M3-M5
- New CLI options: `--cqp`, `--enable-intrabc`, `--hbd-mds`, `--enable-kf-tf`
- Added raw OBU output format as an alternative to IVF
- Signal `initial_display_delay` in sequence header to fix A/V sync on seek
RTC / Low Delay
- Added CBR rate control with Kalman-filter QP estimation, cyclic refresh, and frame re-encode
- Added on-the-fly MG size, preset, bitrate, and frame rate changes
- Added reference frame management API with LTR support and two-layer RPS structure
- Exposed `--max-intra-bitrate-pct` and `--max-inter-bitrate-pct` parameters
- Improved compression efficiency vs. cycle tradeoff across RTC presets
- Optimized memory footprint for RTC mode with small resolutions
- Further speed and quality tuning for RTC
Encoder (general)
- Refactored entropy coding: direct tile-buffer writes, arithmetic coder simplifications, coefficient shaving
- CDEF optimizations: 8-bit boundary-aware filter, persistent scratch buffers, luma/chroma specialization
- MD and ME optimizations (LPD1 early-skip, VLPD0 fast path, static-block ME bypass)
- Optimized still-image screen content detection
- Optimized TPL dispatch when TPL is disabled
- Added `ENABLE_STACK_PROTECTOR` CMake option to prevent the stack protector flag from being added
Arm
- Added lowbd (8-bit) int16 forward transform NEON kernels (4x4 through 32x32)
- Added Neon SAD, quantize-matrix, SSIM, VMAF, variance, and pixel projection error kernels
- Added SVE2 VMAF kernels and hardware CRC-32C for hash-based ME
- Optimized convolution, full distortion, and SAD calculation functions
Bug fixes and documentation
- Fixed superres recode crash, RESIZE_DYNAMIC under `--rtc`, RTC candidate-count overflow, recon output, and memory leak
- Fixed signed left-shift UB, OOB reads, and race conditions in rate control
- Added NVTX/Nsight Systems profiling hooks, PPC toolchain, and macOS universal binary support
- Addressed cppcheck warnings and rewrote affected unit tests
- Addressed USAN and MSAN warnings
- Reduced OBMC stack usage to fix a crash with PGO
- General code cleanup, documentation updates, and test improvements
VOD / Random Access
- Added TUNE-VMAF mode targeting ~15% VMAF BD-rate improvement at minimal PSNR loss
- Implemented single-thread processing mode with RA handling
- RA preset tuning and bitrate optimization for M3-M5
- New CLI options: `--cqp`, `--enable-intrabc`, `--hbd-mds`, `--enable-kf-tf`
- Added raw OBU output format as an alternative to IVF
- Signal `initial_display_delay` in sequence header to fix A/V sync on seek
RTC / Low Delay
- Added CBR rate control with Kalman-filter QP estimation, cyclic refresh, and frame re-encode
- Added on-the-fly MG size, preset, bitrate, and frame rate changes
- Added reference frame management API with LTR support and two-layer RPS structure
- Exposed `--max-intra-bitrate-pct` and `--max-inter-bitrate-pct` parameters
- Improved compression efficiency vs. cycle tradeoff across RTC presets
- Optimized memory footprint for RTC mode with small resolutions
- Further speed and quality tuning for RTC
Encoder (general)
- Refactored entropy coding: direct tile-buffer writes, arithmetic coder simplifications, coefficient shaving
- CDEF optimizations: 8-bit boundary-aware filter, persistent scratch buffers, luma/chroma specialization
- MD and ME optimizations (LPD1 early-skip, VLPD0 fast path, static-block ME bypass)
- Optimized still-image screen content detection
- Optimized TPL dispatch when TPL is disabled
- Added `ENABLE_STACK_PROTECTOR` CMake option to prevent the stack protector flag from being added
Arm
- Added lowbd (8-bit) int16 forward transform NEON kernels (4x4 through 32x32)
- Added Neon SAD, quantize-matrix, SSIM, VMAF, variance, and pixel projection error kernels
- Added SVE2 VMAF kernels and hardware CRC-32C for hash-based ME
- Optimized convolution, full distortion, and SAD calculation functions
Bug fixes and documentation
- Fixed superres recode crash, RESIZE_DYNAMIC under `--rtc`, RTC candidate-count overflow, recon output, and memory leak
- Fixed signed left-shift UB, OOB reads, and race conditions in rate control
- Added NVTX/Nsight Systems profiling hooks, PPC toolchain, and macOS universal binary support
- Addressed cppcheck warnings and rewrote affected unit tests
- Addressed USAN and MSAN warnings
- Reduced OBMC stack usage to fix a crash with PGO
- General code cleanup, documentation updates, and test improvements
View full changelog
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| 3 reviews, Showing 1 to 3 reviews |
Beats H265 and H264 in terms of quality. H265 is around but has never achieved the popularity of H264.
Will AV1 or later codecs, become popular-who really knows? I have a feeling H264 will still be No1 for a while yet!
Will 8k TV nonsense trigger more consumer mania of 'I must have this latest TV,'because 8k must be better than 4k right?
Will AV1 or later codecs, become popular-who really knows? I have a feeling H264 will still be No1 for a while yet!
Will 8k TV nonsense trigger more consumer mania of 'I must have this latest TV,'because 8k must be better than 4k right?
Review by Bobby D on
Jul 1, 2023 Version: 1.6.0
OS: Windows 10 64-bit Ease of use: 8/10
Functionality: 10/10
Value for money: 10/10
Overall: 9/10
A great free AV1 encoder, which get faster from version to version. I tested it with a GUI and was very suprised about the video quality. It is much better than h265 and even more better than h264. The encoding presets make it easier to encode video files to AV1-Format.
On my Intel i7 8700k CPU computer preset 8 delivers more details with the same bitrate in comparison to h265 or h264. It is impressive.
---
I am very unhappy about the missing executable files and the download link to the sourcecode.
On my Intel i7 8700k CPU computer preset 8 delivers more details with the same bitrate in comparison to h265 or h264. It is impressive.
---
I am very unhappy about the missing executable files and the download link to the sourcecode.
Review by James Pous on
Aug 25, 2022 Version: 1.2.0
OS: Windows 10 64-bit Ease of use: 7/10
Functionality: 9/10
Value for money: 10/10
Overall: 9/10
Rating by VincAlastor on
Dec 31, 2020 Version: 0.8.6
OS: Windows 10 64-bit Ease of use: 10/10
Functionality: 8/10
Value for money: 10/10
Overall: 10/10
| 3 reviews, Showing 1 to 3 reviews |
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Our hosted software are virus and malware scanned with several antivirus programs using www.virustotal.com. (NOTE! Just one virustotal warning is 99.9% a false positive. And some software might receive 2-6 warnings but it's if they are not all same virus/trojan then it's 99% false positives.)
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Latest version
Version number / Beta version number / Update version number and when it whas released.
Type and download
NO MORE UPDATES? = The software hasn't been updated in over 2 years.
NO LONGER DEVELOPED = The software hasn't been updated in over 5 years.
RECENTLY UPDATED = The software has been updated the last 31 days.
Freeware = Download Free software.
Freeware Trialware = Download Free software but some parts are trial/shareware.
Free software = Download Free software and also open source code also known as FOSS (Free and Open Source Software).
Free software Trialware = Download Free software and also open source code but some parts are trial/shareware.
Freeware Ads = Download Free software but supported by advertising, usually with a included browser toolbar. It may be disabled when installing or after installation.
Free software Ads = Free Download software and open source code but supported by advertising, usually with a included browser toolbar. It may be disabled when installing or after installation.
Trialware = Also called shareware or demo. Free Trial version available for download and testing with usually a time limit or limited functions.
Payware = No demo or trial available.
Portable version = A portable/standalone version is available. No installation is required.
v1.0.1 = Latest version available.
Download beta = It could be a Beta, RC(Release Candidate) or an Alpha / Nightly / Unstable version of the software.
Download 15MB = A direct link to the software download.
Win = Windows download version for 32-bit and 64-bit Windows.
Win64 = Windows 64-bit download version for 64-bit Windows.
WinARM64 = Windows 64-bit ARM download version for Windows ARM64/AArch64.
Mac = Mac download version for 64-bit Mac OS Intel/ARM64/AArch64.
MacARM64 = Mac Silicon download version for 64-bit Mac OS ARM64/AArch64.
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Linux ARM = Linux download version for Linux ARM64/AArch64.
Portable = Portable version. No installation is required.
Ad-Supported = The software is bundled with advertising. Be careful when you install the software and disable addons that you don't want!
Visit developers site = A link to the software developer site.
Download (mirror link) = A mirror link to the software download. It may not contain the latest versions.
Download old versions = Free downloads of previous versions of the program.
Download 64-bit version = If you have a 64bit operating system you can download this version.
Download portable version = Portable/Standalone version meaning that no installation is required, just extract the files to a folder and run directly.
Portable version available = Download the portable version and you can just extract the files and run the program without installation.
Old versions available = Download old versions of the program.
Version history available = Complete changelog on our site.
= Windows version available. = Mac OS version available. = Linux version available.Our hosted software are virus and malware scanned with several antivirus programs using www.virustotal.com. (NOTE! Just one virustotal warning is 99.9% a false positive. And some software might receive 2-6 warnings but it's if they are not all same virus/trojan then it's 99% false positives.)
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