Based on libaom, rav1e provides developers with a powerful AV1 encoder whose purpose is to provide faster processing speed and multiple customization options for quick and easy encoding.
The encoder is available as a console application and a Windows SDK. In the following, we will describe a few of the most important options available as extra arguments for the command prompt tool. To see all the description of all the arguments described in detail, you can run the “–fullhelp” option.
Single and multi-pass encoding
rav1e features inter, intra and switch frames, with customizable keyframe interval. You can easily set the threadpool size and specify the number of tile rows, columns and tiles. The pixel range is customizable and so are the frame rate, the bitrate and the time scale.
rav1e features both constant quantizer and target bitrate encoding modes, with both single and mullti-pass encoding. In the first pass of a two-pass encoding operation, the data is saved to a specified file, ready for future passes. In the second pass, the input data is a file previously saved in the first pass.
Find the perfect balance between speed and quality
The processing speed level can be changed to whatever is convenient to you in a range from o to 10, but keep in mind that the maximum and the minimum values are generally not recommended. The lower the speed (closer to the value of 0), the higher the quality. You can also tune the quality by choosing between PSNR and Phychovisual.
The number of frames to encode can be limited. rav1e supports 8-, 10- and 12-bit depth color and comes with various chroma sampling options.
Console-based AV1 encoder
rav1e brings to the table a console-based AV1 video encoder that comes with a wide range of customizable options, ready to help you process your video files at high speed. With various prediction and encoding modes, customizable parameters and still picture mode, it provides a faster encoder for AV1 videos that can also be integrated within your own application, due to its console-based interface.
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· Command line tool for the console-based AV1 video encoder
· Set keyframe interval, threadpool size and provide the number of tile rows, tiles and columns.
· Set pixel range, target bitrate, time scale, frame rate, and bitrate range.
· Optionally, choose single pass or multi-pass mode with start and end of each pass.
· Optionally, choose the encoder to be set up with 1, 2, or 3 passes with each pass having its own separate file to be saved after each pass.
Multi-pass AV1 encoder
It requires the following three files:
scale (0.5, 1, 2)
This multi-pass AV1 encoder is used for encoding your videos if you want to use fast and efficient multi-pass encoding. It enables you to make use of the first pass for the encoding of the second pass, which saves a preset state after each iteration of encoding. This multi-pass AV1 encoder provides an array of scalable video quality presets for maximum flexibility and its operation is fully documented through the “–help” parameter.
The output files are saved in the directory specified through the argument “–outdir”. It is accepted if the “–outdir” directory does not exist.
./av1_enc_main –frame_rate=30 –bitrate=1000 –quality=1 –threadpool=10 –intra_tiles=12 –fullhelp
You have the following control parameters to configure the multi-pass encoder:
· Frame rate in a range from 15 to 30 frames per second.
· Bitrate in a range from 0 to 4026.
· Number of tile rows, columns, and tiles in a range from 1 to 16.
· AOM_CODEC_ENC_CONFIG.py file path.
· AOM.py file path.
· Scaling presets option (0.5, 1, 2).
· The threadpool size in a range from 1 to 10.
Runtime checks and warnings
In the case of error, using the “–fullhelp” option will show you in detail what can go wrong, as well as providing information about the error
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The rav1e encoder provides multi-threading and can operate as a console application and a Windows SDK. The rav1e SDK also includes an API that you can use to accelerate your own code. The API brings a variety of video parameters such as Nal and Pcnc / Gop or DV4 compression techniques and SPS and PPS locations. The rav1e SDK also includes an API that you can use to get the encoder options, retrieve encoder frames in file form and query and change parameters.
A great encoder for console and SDK
The rav1e encoder is available as console application and Windows SDK. It supports capture frames to file. When working with console application, rav1e takes parameters from the command-line. rav1e also supports multiple encoders. The API that’s written in C++ can be integrated into your applications.
The rav1e SDK was designed with the aim of easy interfacing with the encoder. The following interfaces are available:
The API is easy to use, and you can quickly and efficiently integrate into your own application. The API includes the following:
• av_opt_set API
• rav1e encoder options
• rav1e encoder API
• AVFrame* frames in file form
• select frame in file form
• search for frame in file form
• get AVCodecParameters of rav1e encoder
• get encoder options
• set encoder options
• get rav1e encoder interface
• get rav1e encoder API for a certain interface
The API also includes wrappers for the dll API, which allow you to easily use the API with C#.
The following functions are available when working with API:
The API, when using the C API, is compatible with the Windows SDK. When using the Dll API, the API can easily be called from the.NET Framework.
Only one encoder is needed
rav1e can work without the need for second encoder, so you can only use it with only one encoder. When using the console application
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A multi-pass AV1 video encoder designed to produce high-quality AV1 videos.
rav1e features an universal quantization level, which is useful for different applications. By default, the quantization levels are set to 5, 10, 15, 20, and 25, but users can change them as they want. Moreover, users can modify the bitrate, frame size, frame rate, and time scale on a frame-by-frame basis. rav1e’s API allows you to create your own custom frame size or even user-defined bitrate in the input stream, to support unique application requirements.
The API is also convenient for customizing and streamlining workflows, which helps developers improve their encoding speed and thus maximize the performance of their applications. The encoder supports various chroma sampling options that give you control over the chroma format of input video. In addition, the API also gives you control over the graphics and animation frame size, codecs, bitrate, chroma sampling, as well as quantization level and tile size.
The encoding process itself is controlled using two main sources of data: the input stream and the configuration file.
All the configuration files can be found in the “config” folder and organized in subfolders for each feature. These files have a “.cpp” extension, and contain all the code to handle each feature. A Visual Studio project with the source code is available to help you further integrate this feature within your own application.
It is important to note that rav1e is a multi-pass AV1 video encoder that handles AV1 Frame and AV1 frame Group size. By default, the encoder supports 8, 10 and 12 bit depth color and i420 chroma samples. For AV1 Frame size change, the bitrate of the first pass must be set to the default value 100kbps to change the initial AV1 frame size. Then you can set the desired amount of bitrate value for the other AV1 frame sizes. For AV1 frame Group, users can change the bitrate of the first pass to modify the initial AV1 frame Group size. Then you can set the desired amount of bitrate value for the other AV1 frame Group sizes.
* Not support more than 2 passes.
* Not support output cache.
* Not support
What’s New in the Rav1e?
Extend your previous work and build new applications with rav1e. The console-based AV1 encoder comes with a wide range of settings for optimizing the overall performance. It also features an advanced encoding mode, just by setting up your own bitstream generator and initializing rav1e according to the instructions provided in the documentation.
In this article we will show you how to setup rav1e on Windows-based systems. We will take a look at some of the options available when using rav1e via the command prompt tool and will also go through the process for initiating a single or multiple pass encoding with rav1e.
You can start to configure rav1e through the command prompt tool using the “-conf” argument. After pressing Enter, you will be prompted for the following parameters:
1. Encoding mode: The selected encoding mode and depth of color.
2. Frame rate: Frame rate is the frequency at which videos are displayed. The specific range is from 1 to 63 frames per second (fps) or from 15 to 24 fps, default is 25 fps.
3. Predictive mode: In predictive mode, the encoder sends the inverse frequency domain signature and the transform coefficients.
4. Intra frame encoding: Intra-frame encoding is a type of encoding where the frames are encoded as a whole, without the addition of the header required for inter-frame encoding. This flag is initially set to On, and the pass is used to save the frames.
5. Selective decoding: Selective decoding is a feature that allows you to set up an encoder that decodes only the selected data from input file.
6. Target bitrate: Set the bitrate for the encoding operation.
7. Pixel range: Choose between constant quality (which is normally the best choice) and PSNR quality.
8. Frame quantization: Quantize the frame uniformly or selectively, allowing you to set the exact bitrate for each frame.
9. Cronkite difference: Setting the cronkite difference ensures that the level of quality is perfect.
10. Chroma sampling: Set the chroma sampling options, and which chroma sampling is used.
You can easily select whether or not you want to make use of the GPU or CPU to assist in processing the video content with this setting, which can prove to be extremely useful
System Requirements For Rav1e:
– Any Intel® or AMD based processor
OS: Windows 10, Windows 8.1, Windows 7, Windows Vista
Memory: 2 GB of RAM
Video: NVIDIA® GeForce® GTX 750, Intel® HD 4000, AMD Radeon HD 6670
Storage: 8 GB of available storage space
Please note that the recordings do not include the voice overs or the background music. The game will be treated as a stand-alone video game.
In Game Instructions: