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OpusTools is a set of tools to encode, inspect, and decode audio in the Opus audio codec format. Command line tools. Opus is a totally open, royalty-free, highly versatile audio codec. Opus is unmatched for interactive speech and music transmission over the Internet, but is also intended for storage and streaming applications.
Free software
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File size: 5MB
Portable version
Old versions
Version history
OS:
File size: 5MB
Portable version
Old versions
Version history
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Latest version
Download
Download OpusTools 0.2+34 libopus 1.4+9 5MB Win
Portable 
Download old versions
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Supported operating systems
Version history / Release notes / Changelog / What's New
Mar 4, 2024
Opus 1.5 is the first release to make extended use of ML in the encoder and decoder. You can read all the details in this release demo page. In summary, major changes since 1.4 include:
Significant improvement to packet loss robustness using Deep Redundancy (DRED)
Improved packet loss concealment through Deep PLC
Low-bitrate speech quality enhancement down to 6 kb/s wideband
Improved x86 (AVX2) and Arm (Neon) optimizations
Support for 4th and 5th order ambisonics
In addition to the improvements above, this release includes many minor bug fixes. Opus 1.5.1 fixes the meson build that was broken in 1.5.
Opus 1.5 is the first release to make extended use of ML in the encoder and decoder. You can read all the details in this release demo page. In summary, major changes since 1.4 include:
Significant improvement to packet loss robustness using Deep Redundancy (DRED)
Improved packet loss concealment through Deep PLC
Low-bitrate speech quality enhancement down to 6 kb/s wideband
Improved x86 (AVX2) and Arm (Neon) optimizations
Support for 4th and 5th order ambisonics
In addition to the improvements above, this release includes many minor bug fixes. Opus 1.5.1 fixes the meson build that was broken in 1.5.
View full changelog
All features
Opus can handle a wide range of audio applications, including Voice over IP, videoconferencing, in-game chat, and even remote live music performances. It can scale from low bitrate narrowband speech to very high quality stereo music. Supported features are:
Bitrates from 6 kb/s to 510 kb/s
Sampling rates from 8 kHz (narrowband) to 48 kHz (fullband)
Frame sizes from 2.5 ms to 60 ms
Support for both constant bitrate (CBR) and variable bitrate (VBR)
Audio bandwidth from narrowband to fullband
Support for speech and music
Support for mono and stereo
Support for up to 255 channels (multistream frames)
Dynamically adjustable bitrate, audio bandwidth, and frame size
Good loss robustness and packet loss concealment (PLC)
Floating point and fixed-point implementation
Bitrates from 6 kb/s to 510 kb/s
Sampling rates from 8 kHz (narrowband) to 48 kHz (fullband)
Frame sizes from 2.5 ms to 60 ms
Support for both constant bitrate (CBR) and variable bitrate (VBR)
Audio bandwidth from narrowband to fullband
Support for speech and music
Support for mono and stereo
Support for up to 255 channels (multistream frames)
Dynamically adjustable bitrate, audio bandwidth, and frame size
Good loss robustness and packet loss concealment (PLC)
Floating point and fixed-point implementation
Sections/Browse similar tools
Guides and How to's
Acronyms / Also Known As
Download OpusTools Portable download from the Download links under Download and Download other versions!
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| 4 reviews, Showing 1 to 4 reviews |
I'm thankful VidoHelp offers the Windows binaries for Opus using libopus version v1.4+9 (2023-12-11). The official site for opus (https://opus-codec.org/downloads/) shows a newer version of libopus (1.5.2 from April 12, 2024) available only as source code in .tar.gz format. The only downloadable binaries for Windows offered on the official site use libopus 1.3 from 2018.
I've started using Opus whenever I can to compress audio CDs, both music and audiobooks. BTW, the library has many audiobooks available in audio CD format, which is superior to the quality offered on Libby/Overdrive. The only thing wrong with compressing audio in mp3 format is when people do it sub-optimally, and you can hear the artifacts. Libby/Overdrive now standardizes on mp3s using 64 kB constant bit rate (CBR) 44 kHz joint stereo, which is decent for audiobooks with a single narrator and no music, but some audiobooks are dramatized with sound effects, and you can hear artifacts in those parts unfortunately. Older Libby/Overdrive books can be much worse with more aggressive compression settings, and sometimes they sound like they have been compressed more than once. Libby could easily solve this problem by using the default -V6 settings which uses VBR, scales up the required bandwidth when needed, and uses less bandwidth during the silence, which would produce a superior compression at a similar and usually smaller file size. MP3 has been around for decades, and when storage was expensive, people sacrificed sound quality and compressed music at 128 kB, which was audibly noticeable. Some blamed MP3 as a poor encoder. There have been several mp3 encoders over the years, and some were much worse than others, but LAME as an MP3 encoder has been very good for a very long time, since the 3.91 days. Today, LAME v 3.100 is the best it has ever been, and when using the default VBR settings -V2 for music and -V6 for audiobooks, most people can't tell the difference between the LAME compressed files and raw WAV files. I can't, and that's what matters to me. Today, all the compression formats, FLAC, OGG, MP3, Opus, etc., are great when configured properly.
So why would I use Opus if MP3 is so great? Read directly from the opus-codec.org website about the benefits of Opus. In summary, it's a newer technology with a better approach covering a wider range of input sources with a major focus on streaming. Media players on Windows, Linux, Android, and iOS also play .opus files natively without fuss. All new YouTube content uses Opus for the highest and lower-quality audio streams. Opus also supports chaptering, which is really nice if you want to create a single file for audiobooks. Comparing the file size of MP3 -V6 with Opus 64 kB, they are about the same, which is amazing at 18-20x compression. Overall, Opus is probably just better. But you probably already know that if you are here and reading this review.
Why not use Opus all the time? Editing is the main advantage that MP3 has over Opus. Of course, you can edit the raw wave files first and then compress, but when ripping CDs, it's convenient to go ahead and compress at rip time, and it's more convenient dealing with much smaller file sizes. FFmpeg is great at combining either MP3 files or Opus files, however, I haven't found a simple GUI editor that will losslessy cut .opus files. In contrast, there are a lot of great tools out there for tagging MP3s and a few GUI tools that losslessly edit/split MP3s (mp3splt for Linux and Windows being the best one I've found). I use Opus when audiobooks are clean and don't have garbage like: "This is the beginning of disc X" and "This is the end of the disc, please insert the next disc" at the beginning and end of each disc and not on their own tracks. Or discs from Brilliant Audio that put 99 tracks per disc and don't put the chapter breaks at the beginning of the track. When editing is required, I use MP3.
Using Opus is the same level of difficulty as MP3. Most people who rip CDs know about EAC (Exact Audio Copy). EAC uses a simple configuration tool where you point to the encoder .exe file and pass the encoding parameters. For MP3, you point EAC to lame.exe and then pass in the encoding parameters if you want to add metadata to the files. In EAC, I use -V2 for near CD quality music and -V6 for audiobooks with the following parameters:
-V6 --add-id3v2 --pad-id3v2 --ignore-tag-errors --ta "%artist%" --tt "%title%" --tl "%albumtitle%" --ty "%year%" --tn "%tracknr3%" %source%
To use Opus, you point EAC to the Opus encoder (I use opusenc.x64.avx.exe on my Intel CPU machines that support AVX) with the following parameters where bitrate is defined in the drop-down box in EAC. I use 64 kBit/s for Audiobooks and 192 kBit/s for music CDs.
--bitrate %bitrate% --artist "%artist%" --title "%title%" --tracknumber %tracknr3% --album "%albumtitle%" --date "%year%" %source% %dest%
So, the level of complexity is the same when using Opus vs MP3 with EAC. I believe FFmpeg has both MP3 and Opus libraries as part of the default install and can be used to combine either type of file. For example, in Linux, to combine all the MP3 files in a directory together and write them to the /FFmpeg subdirectory of the present working directory (PWD) you are working in, use this command:
ffmpeg -f concat -safe 0 -i
I've started using Opus whenever I can to compress audio CDs, both music and audiobooks. BTW, the library has many audiobooks available in audio CD format, which is superior to the quality offered on Libby/Overdrive. The only thing wrong with compressing audio in mp3 format is when people do it sub-optimally, and you can hear the artifacts. Libby/Overdrive now standardizes on mp3s using 64 kB constant bit rate (CBR) 44 kHz joint stereo, which is decent for audiobooks with a single narrator and no music, but some audiobooks are dramatized with sound effects, and you can hear artifacts in those parts unfortunately. Older Libby/Overdrive books can be much worse with more aggressive compression settings, and sometimes they sound like they have been compressed more than once. Libby could easily solve this problem by using the default -V6 settings which uses VBR, scales up the required bandwidth when needed, and uses less bandwidth during the silence, which would produce a superior compression at a similar and usually smaller file size. MP3 has been around for decades, and when storage was expensive, people sacrificed sound quality and compressed music at 128 kB, which was audibly noticeable. Some blamed MP3 as a poor encoder. There have been several mp3 encoders over the years, and some were much worse than others, but LAME as an MP3 encoder has been very good for a very long time, since the 3.91 days. Today, LAME v 3.100 is the best it has ever been, and when using the default VBR settings -V2 for music and -V6 for audiobooks, most people can't tell the difference between the LAME compressed files and raw WAV files. I can't, and that's what matters to me. Today, all the compression formats, FLAC, OGG, MP3, Opus, etc., are great when configured properly.
So why would I use Opus if MP3 is so great? Read directly from the opus-codec.org website about the benefits of Opus. In summary, it's a newer technology with a better approach covering a wider range of input sources with a major focus on streaming. Media players on Windows, Linux, Android, and iOS also play .opus files natively without fuss. All new YouTube content uses Opus for the highest and lower-quality audio streams. Opus also supports chaptering, which is really nice if you want to create a single file for audiobooks. Comparing the file size of MP3 -V6 with Opus 64 kB, they are about the same, which is amazing at 18-20x compression. Overall, Opus is probably just better. But you probably already know that if you are here and reading this review.
Why not use Opus all the time? Editing is the main advantage that MP3 has over Opus. Of course, you can edit the raw wave files first and then compress, but when ripping CDs, it's convenient to go ahead and compress at rip time, and it's more convenient dealing with much smaller file sizes. FFmpeg is great at combining either MP3 files or Opus files, however, I haven't found a simple GUI editor that will losslessy cut .opus files. In contrast, there are a lot of great tools out there for tagging MP3s and a few GUI tools that losslessly edit/split MP3s (mp3splt for Linux and Windows being the best one I've found). I use Opus when audiobooks are clean and don't have garbage like: "This is the beginning of disc X" and "This is the end of the disc, please insert the next disc" at the beginning and end of each disc and not on their own tracks. Or discs from Brilliant Audio that put 99 tracks per disc and don't put the chapter breaks at the beginning of the track. When editing is required, I use MP3.
Using Opus is the same level of difficulty as MP3. Most people who rip CDs know about EAC (Exact Audio Copy). EAC uses a simple configuration tool where you point to the encoder .exe file and pass the encoding parameters. For MP3, you point EAC to lame.exe and then pass in the encoding parameters if you want to add metadata to the files. In EAC, I use -V2 for near CD quality music and -V6 for audiobooks with the following parameters:
-V6 --add-id3v2 --pad-id3v2 --ignore-tag-errors --ta "%artist%" --tt "%title%" --tl "%albumtitle%" --ty "%year%" --tn "%tracknr3%" %source%
To use Opus, you point EAC to the Opus encoder (I use opusenc.x64.avx.exe on my Intel CPU machines that support AVX) with the following parameters where bitrate is defined in the drop-down box in EAC. I use 64 kBit/s for Audiobooks and 192 kBit/s for music CDs.
--bitrate %bitrate% --artist "%artist%" --title "%title%" --tracknumber %tracknr3% --album "%albumtitle%" --date "%year%" %source% %dest%
So, the level of complexity is the same when using Opus vs MP3 with EAC. I believe FFmpeg has both MP3 and Opus libraries as part of the default install and can be used to combine either type of file. For example, in Linux, to combine all the MP3 files in a directory together and write them to the /FFmpeg subdirectory of the present working directory (PWD) you are working in, use this command:
ffmpeg -f concat -safe 0 -i
Review by rsadix on
Aug 4, 2024 Version: libopus v1.4+9
OS: Windows 10 64-bit Ease of use: 10/10
Functionality: 10/10
Value for money: 10/10
Overall: 10/10
Honestly, I've tested dozens of encoders and Opus is the best one, no doubt. I don't agree that it's "too complicated", the commands can easily be found and they are much more simples than other encoders, not only that, there are a few frontend GUI if you don't want the trouble to type commands... The only thing I'll say, though, is that for an "open source" software, it doesn't have much updates. It's been "forgotten" for years.
Review by Raphael on
Feb 5, 2024 Version: OpusTools 0.2
OS: Windows 11 64-bit Ease of use: 10/10
Functionality: 10/10
Value for money: 10/10
Overall: 10/10
Great at what it does, but too complicated to use for most users. I much prefer he-aacV1 48kbps as the sweet spot. Any lower e.g using V2 makes the sound very tinny. Any higher is better sounding e.g 64kbps but recreates higher frequencies which most cannot hear anyways. Opus is better at these low bitrates, but why damage audio to even tinirr bitrates when lots of radio stations are using aacPlus these days to better use?
Review by John on
Jan 7, 2021 Version: 0.2.1
OS: Windows 8 64-bit Ease of use: 1/10
Functionality: 9/10
Value for money: 10/10
Overall: 8/10
Rating by fluidinmo on
May 30, 2017 Version: 1.2 beta
OS: Windows 10 64-bit Ease of use: 8/10
Functionality: 10/10
Value for money: 10/10
Overall: 10/10
| 4 reviews, Showing 1 to 4 reviews |
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Trialware = Also called shareware or demo. Free Trial version available for download and testing with usually a time limit or limited functions.
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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. It works on 32-bit and 64-bit Windows.
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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.
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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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