Introduction to FFmpeg

What's New

Optimized scaling algorithms (Bilinear, Bicubic, and Lanczos) within the libswscale library of FFmpeg-4.4.2 based on Kunpeng servers.
Optimized the sws_scale function in the libswscale library of FFmpeg-7.1.1 based on Kunpeng servers.

Overview

Kunpeng FFmpeg optimizes FFmpeg based on Kunpeng servers. It stores patches for FFmpeg performance optimization. The patch provides the following functions:

sws_scale optimization: The sws_scale function is one of the core functions of the libswscale library in the FFmpeg framework. It is mainly used for image scaling, color space conversion (CSC), and pixel format conversion. The CSC optimization patch improves performance by parallelizing CSC functions.
ffmpeg_4.4.2-optimize-scale.patch: is used to optimize scaling algorithms (Bilinear, Bicubic, and Lanczos) within the libswscale library of FFmpeg-4.4.2. The vectorization customization and rewriting in different scenarios enable SVE vectorization and instruction pipelining, improving the performance of current scaling algorithms.

Directory Structure

├──docs/                                         # Project document directory
│   ├── en/                                      # English document directory
│   │   ├── ffmpeg_4.4.2_install_guide.md        # FFmpeg-4.4.2_scale installation guide
│   │   ├── LICENSE                              # Document license
├──patch_for_ffmpeg_4.2.2_to_support_HW265ENC/   # Directory of the HW265 encoder FFmpeg-4.2.2 plugin
├──patch_for_ffmpeg_7.0.1_to_support_HW265ENC/   # Directory of the HW265 encoder FFmpeg-7.0.1 plugin
├──ffmpeg_4.4.2-optimize-scale.patch             # FFmpeg-4.4.2 scaling algorithm optimization patch
├──huawei_ffmpeg-7.1.1_sws_scale_optimize.patch  # FFmpeg-7.1.1 scaling algorithm optimization patch
├──LICENSE                                       # Open-source license
├──.gitattributes                                # Git attribute configuration file
├──COPYING.LGPLv2.1                              # LGPL v2.1 license text
├──ffmpeg-7.1.1.tar.gz                           # FFmpeg 7.1.1 source code package
└── README.md                                    # Project description document

FFmpeg 7.1.1 Scaling Optimization

Feature Description

The sws_scale function is one of the core functions of the libswscale library in the FFmpeg framework. It is mainly used for image scaling, color space conversion (CSC), and pixel format conversion. The CSC optimization patch improves performance by parallelizing CSC functions.

Version Description

Open-Source Software Version	Patch Feature
FFmpeg-7.1.1	sws_scale function optimization

Environment Deployment

Clone this repository.

git clone https://gitcode.com/boostkit/ffmpeg.git
cd ffmpeg

Decompress the FFmpeg-7.1.1 source code.
```
tar -zxf ffmpeg-7.1.1.tar.gz 
```
Copy the FFmpeg patch to the root directory of the FFmpeg-7.1.1 code.
```
cp huawei_ffmpeg-7.1.1_sws_scale_optimize.patch ffmpeg-7.1.1/
```

Apply the FFmpeg patch.

cd ffmpeg-7.1.1
patch -p1 < huawei_ffmpeg-7.1.1_sws_scale_optimize.patch

Compile FFmpeg. You need to add the corresponding OpenMP options. (The following commands are for reference only. Integrate the corresponding encoding library as required.)
```
./configure --enable-shared --enable-pthreads --enable-gpl --extra-cflags="-fopenmp" --extra-ldflags="-fopenmp"
make
sudo make install
```

Check whether FFmpeg is installed.

export PATH=/usr/local/bin:$PATH
export LD_LIBRARY_PATH=/usr/local/lib:$LD_LIBRARY_PATH
ffmpeg -version

FFmpeg 4.4.2 Scaling Optimization

Feature Description

This feature optimizes scaling algorithms (Bilinear, Bicubic, and Lanczos) within the libswscale library of FFmpeg-4.4.2. The vectorization customization and rewriting in different scenarios enable SVE vectorization and instruction pipelining, improving the performance of current scaling algorithms.

Version Description

Open-Source Software Version	Patch Feature
FFmpeg-4.4.2	Optimization of the Bilinear, Bicubic, and Lanczos algorithms in the sws_scale function

Environment Deployment

For details about how to deploy the environment for scaling optimization in FFmpeg-4.4.2, see FFmpeg-4.4.2_scale Installation Guide.

Quick Start

# Use the YUV sequence for testing.
taskset -c 88 /home/path/to/ffmpegInstall/bin/ffmpeg -f rawvideo -pix_fmt yuv420p -video_size 1920x1080 -i /home/path/to/video/Ca4_1920x1080.yuv -vf "scale=1280:720" -sws_flags "bilinear" -pix_fmt yuv420p -y output_1280x720.yuv

License

This project is licensed under GNU LESSER GENERAL PUBLIC LICENSE 2.1. For details, see LICENSE.

The documents of this project are licensed under CC-BY 4.0. For details, see LICENSE.

Contribution Statement

We welcome your contributions to the community. If you have any questions/suggestions or want to provide feedback on feature requirements and bug reports, you can submit issues. For details, see the contribution guideline. You are also welcome to share insights in Discussions. Thank you for your support.