Blog

Technical articles on WebRTC, audio/video processing, GPU image filters, and more.

Skin Segmentation in Beauty/Makeup Development — Applications and Implementation

Park·April 6, 2026

Skin Segmentation in Beauty/Makeup Development — Applications and Implementation

Finding C++ Build Bottlenecks with ClangBuildAnalyzer

As projects grow and dependencies become more complex, C++ build times increase. The open-source tool ClangBuildAnalyzer can effectively analyze time spent in files, functions, and header inclusion expansion, providing a reference for build-time optimization.

Park·December 2, 2024

Finding C++ Build Bottlenecks with ClangBuildAnalyzer

Deep Learning

Deep Learning Python Basics — Classes and Modules

Deep Learning Python Basics — functions, classes, and modules

Park·September 11, 2024

Deep Learning

Deep Learning Notes — Building a Convolutional Neural Network

Getting started with deep learning — notes on building a convolutional neural network for an intuitive introduction, especially useful for beginners.

Park·September 3, 2024

Deep Learning Notes — Building a Convolutional Neural Network

Audio/Video Development

Detailed WebRTC GCC Congestion Control Performance Measurements

This article analyzes WebRTC's GCC congestion control mechanism and records measurement data to build a quantitative understanding of its congestion control behavior.

Park·September 1, 2024

Detailed WebRTC GCC Congestion Control Performance Measurements

Audio & Video Development

An Introduction to Google's depot_tools and gclient

The essential toolset for WebRTC or Chromium development

Park·August 1, 2024

An Introduction to Google's depot_tools and gclient

Audio & Video Development

WebRTC Cross-Platform Build Guide

A detailed guide to downloading and building WebRTC across iOS, Android, Windows, Mac, and Linux

Park·July 30, 2024

Audio & Video Development

Building a WebRTC AppRTC Server with HTTPS Using Docker

Building a WebRTC AppRTC Server with Docker. I recently wanted to test congestion behavior in the latest WebRTC code, so I tried running the built-in AppRTCMobile program. There are many articles on setting up AppRTC servers, but browsers and Apple platforms now require HTTPS. Most guides cannot be used as-is and the setup is tedious. After a day of trial and error, I got it working and documented the process.

Park·July 11, 2024

Building a WebRTC AppRTC Server with HTTPS Using Docker

Audio & Video Development

The Nature of Network Congestion

In simple terms, network congestion means that packets sent over the network are lost in transit or arrive with higher latency because the link is overloaded. Whether you see loss or delay depends on how routers, switches, and other devices along the path are configured. Generally, when the network is congested, packets are first buffered at routers or switches; if that exceeds their capacity, packets are dropped.

Park·July 4, 2024

System

Elegant Logging in Android NDK Development

Park·March 10, 2024

Elegant Logging in Android NDK Development

Configuration Notes

Jekyll Blog Environment Setup Notes

Recently set up a server for my blog. After waiting several days with no response on Alibaba Cloud ICP filing review, I switched to an Alibaba Cloud Hong Kong server. With no heavy workloads, I used the cheapest 1-core, 1 GB RAM plan. The server mainly hosts my personal blog and documentation, built with Jekyll, which requires Ruby 3+. I ran into some pitfalls along the way—documented here.

Park·March 10, 2024

AV Development

Contributing to Open Source — A Walkthrough of Submitting Code to WebRTC

A step-by-step guide to submitting code to WebRTC. I recently fixed a WebRTC bug and walked through the full process—documented here for reference.

Park·March 7, 2024

Contributing to Open Source — A Walkthrough of Submitting Code to WebRTC

AV Development

GPUPixel — Open-Source, High-Performance, Cross-Platform Real-Time Beauty Filter Library

GPUPixel is a high-performance image and video AI beauty effects library written in C++11, similar to GPUImage. It is easy to build and integrate, and the library is very small. GPU-accelerated with built-in filters, it delivers commercial-grade results. Supported platforms include iOS, Mac, Android, Windows, and Linux—it can theoretically be ported to any platform that supports OpenGL/ES.

Park·February 27, 2024

GPUPixel — Open-Source, High-Performance, Cross-Platform Real-Time Beauty Filter Library

AV Development

Why WebRTC Removed the BBR Congestion Control Algorithm

WebRTC removed the BBR congestion control algorithm for a straightforward reason—it was introduced as a trial feature but performed poorly for WebRTC use cases and was never used in production.

Park·December 18, 2023

Why WebRTC Removed the BBR Congestion Control Algorithm

AV Development

Building Android WebRTC on macOS

According to the official WebRTC build guide, the Android version of WebRTC is only supported on Ubuntu. Building Android WebRTC on Ubuntu can be cumbersome—you often end up running a VM, which makes code changes very inconvenient. To simplify the build process, you can migrate the build environment to macOS and apply appropriate modifications for M1 or x86 architectures.

Park·December 14, 2023

Audio/Video Development

H.265, AV1, and H.264 Video Codec Comparison: x265 Underperforms, libaom Shines

This article compares H.265, AV1, and H.264 video codecs in terms of performance, quality, and bandwidth. Encoders tested include x264, x265, VideoToolbox, and libaom on a MacBook Pro 2021 (M1 Pro).

Park·November 8, 2023

H.265, AV1, and H.264 Video Codec Comparison: x265 Underperforms, libaom Shines

Audio/Video Development

RTMP Live Streaming Protocol Deep Dive — From Basics to Advanced Optimization

Understanding how RTMP live streaming works and how to optimize it is essential for better stream quality and user experience. This article walks through RTMP in detail, shares practical optimization tips, and introduces Enhanced RTMP support for H.265 and AV1.

Park·November 5, 2023