JavaScript Conferences

JSNation 2023

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English versionEN

Video: Efficient Video Encoding with WebCodecs

Akash Hamirwasia

Akash Hamirwasia

Razorpay, India

Project website

This Talk explores the challenges and solutions in video encoding with web codecs. It discusses drawing and recording video on the web, capturing and encoding video frames, and introduces the WebCodecs API. The Talk also covers configuring the video encoder, understanding codecs and containers, and the video encoding process with muxing using ffmpeg. The speaker shares their experience in building a video editing tool on the browser and showcases Slantit, a tool for making product videos.

This talk has been presented at JSNation 2023, check out the latest edition of this JavaScript Conference.

Read FAQ and transcription

FAQ

Akash Hamirwasia is a software engineer at Razorpay who loves building web products and contributing to open-source projects. He is known for projects like Blaze, Untabbed, Dyod, and Slanted.

The limitations of the Capture Stream API for video encoding include no constant frame rate, no option to change the video file format (always produces WebM format), low reliability, and output quality that can vary depending on device performance.

The main topic of Akash Hamirwasia's talk at JS Nation 2023 is pushing the limits of video encoding with web codecs.

Some methods to render video frames on the web include CSS animations, modifying the DOM directly using JavaScript, using SVG, and using the HTML Canvas API.

FFmpeg is used as a muxer to combine the encoded video stream into a final video container format. It allows for the inclusion of audio and the creation of a complete video file ready for download.

Slantit is a web-based tool developed by Akash Hamirwasia that allows users to create catchy product videos quickly. It uses the same video encoding process discussed in Akash's talk.

The Capture Stream API is part of the MediaStream Recording API standard and allows for video capture from HTML5 canvas elements.

The purpose of the video editing tool Akash was building was to create catchy product videos quickly on the browser, avoiding the need to download large desktop-based video editing software.

WebCodecs is a set of APIs that provide low-level access to individual frames of a video stream, allowing for asynchronous and hardware-accelerated video encoding and decoding. It supports both video and audio and is crucial for high-quality, efficient video encoding.

The HTML Canvas API is a feature in HTML5 that allows for drawing and manipulating graphics on the web. Akash recommends it because it offers flexibility and various capabilities that other rendering methods do not.

video javascript webassembly browser api

Akash Hamirwasia

Akash Hamirwasia

25 min

05 Jun, 2023

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