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Bilibili Tech

Apr 29, 2025 · Cloud Computing

Bilibili Live Streaming Technology for the Spring Festival Gala: Experience Enhancement and Interactive Features

Bilibili's R&D built a cloud-based broadcast console for the 2024 CCTV Spring Festival Gala, delivering 4K HDR streaming, AI SDR-to-HDR conversion, low latency, bandwidth‑aware transcoding, and a synchronized “send bullet screen” interactive feature using custom SEI timestamps for hundreds of millions of viewers.

HDRLive StreamingSEI

0 likes · 15 min read

Bilibili Live Streaming Technology for the Spring Festival Gala: Experience Enhancement and Interactive Features

HelloTech

Jan 25, 2024 · Backend Development

Design and Implementation of a Custom Multimedia Framework Using FFmpeg

The Haro Street Cat mobile team created a custom multimedia framework that wraps FFmpeg 4.2.2 in a C++ core library with Android/iOS compatibility layers and Java wrappers for transcoding, live streaming, and composition, delivering hardware‑accelerated decoding, flexible filter pipelines, and reliable transcoding that boosted coverage to over 99 %, cut storage by more than 30 %, accelerated video start‑up, and improved streaming and watermarking performance.

AudioC++FFmpeg

0 likes · 27 min read

Design and Implementation of a Custom Multimedia Framework Using FFmpeg

Bilibili Tech

Dec 22, 2023 · Artificial Intelligence

Intelligent Media Technology and Innovative Applications: Information-Theoretic Principles for Transcoding System Optimization

The upcoming Shanghai Jiao‑Tong University seminar on Intelligent Media Technology will feature Bilibili’s Cai Chunlei presenting an information‑theoretic framework for jointly optimizing video transcoding pipelines, linking traditional coding, deep‑learning methods and future large‑model techniques to improve compression and guide practical system design.

AIMedia TechnologySeminar

0 likes · 4 min read

Intelligent Media Technology and Innovative Applications: Information-Theoretic Principles for Transcoding System Optimization

Bilibili Tech

Jan 3, 2023 · Artificial Intelligence

Two‑Pass Deep Learning Bitrate Factor Prediction for Constant‑Quality Segment Encoding in Bilibili Narrow‑Band HD Transcoding

Bilibili’s IEEE‑VCIP‑2022‑accepted two‑pass deep‑learning bitrate‑factor predictor achieves 98.8% accuracy with only 1.55 encoding passes, enabling constant‑quality segment encoding that reduces bitrate consumption by over 15% while maintaining visual quality in its narrow‑band HD transcoding pipeline.

AIBitrate OptimizationDeep Learning

0 likes · 6 min read

Two‑Pass Deep Learning Bitrate Factor Prediction for Constant‑Quality Segment Encoding in Bilibili Narrow‑Band HD Transcoding

Baidu Geek Talk

Oct 12, 2022 · Backend Development

Understanding Video Color Spaces, Gamma Correction, and Transcoding with FFmpeg

Video processing involves converting linear sensor data through gamma correction and multiple color‑space transformations—such as RGB, YUV, and XYZ—using standards like BT.601/709/2020, with FFmpeg’s colorspace filter and ffprobe to manage transfer functions, primaries, and ranges during transcoding to preserve accurate colors across devices.

Color ManagementColor spaceFFmpeg

0 likes · 12 min read

Understanding Video Color Spaces, Gamma Correction, and Transcoding with FFmpeg

Shopee Tech Team

Aug 12, 2022 · Backend Development

Shopee Video Technology: Backend Services, High‑Definition Low‑Bitrate Optimization, and Performance Enhancements

Shopee’s video platform combines live‑stream and on‑demand transcoding, link‑mic, multi‑party mixing, and backend editing services with a proprietary high‑definition low‑bitrate pipeline that leverages GPU and CPU encoders, AI‑enhanced pre‑processing, hierarchical B‑frames, and SIMD‑optimized sharpening to deliver high‑quality video on low‑end devices while cutting compute costs, and the company is actively recruiting engineers for further development.

AI enhancementBackend ServicesReal‑Time Communication

0 likes · 19 min read

Shopee Video Technology: Backend Services, High‑Definition Low‑Bitrate Optimization, and Performance Enhancements

Bitu Technology

Jan 7, 2022 · Backend Development

Design and Implementation of Tubi Multimedia Processing Platform (TMPP)

The article details Tubi's Multimedia Processing Platform (TMPP), describing its architecture, processing stages, resource management, and distributed task scheduling for large‑scale video transcoding and delivery across multiple devices.

Distributed Systemscloud computingmicroservices

0 likes · 8 min read

Design and Implementation of Tubi Multimedia Processing Platform (TMPP)

iQIYI Technical Product Team

Oct 18, 2019 · Frontend Development

Introduction to WebAssembly and Its Application in Live Streaming Transcoding

WebAssembly enables high‑performance, ahead‑of‑time compiled code to run in browsers, and iQIYI leverages it by writing a C‑based FLV‑to‑MP4 transcoder compiled to Wasm, executed in a Web Worker, which boosts live‑stream conversion speed, reduces CPU usage, and opens doors for further web‑based media processing.

C++JavaScriptLive Streaming

0 likes · 11 min read

Introduction to WebAssembly and Its Application in Live Streaming Transcoding