A Browser Needed More Than a Play Button
Watching video in a web browser can appear simple from the user’s side. A page loads, the video starts, and the browser displays moving pictures while producing sound.
Behind that experience is a collection of technologies responsible for packaging, compressing, delivering, decoding, and presenting the media. A browser therefore needs to understand more than the web page surrounding a video. It also needs compatible ways to handle the media itself.
As online video became larger and more common, efficient compression became increasingly important. Delivering good image quality without consuming unnecessary bandwidth was a continuing challenge for browsers, websites, and streaming services.
Streaming Depends on Several Technologies
The container holding the media, the codec compressing the video, the codec handling the audio, and the browser’s streaming capabilities all participate in what eventually appears on the screen.
WebM Was Not the Same Thing as VP9
Media terminology can become confusing because several technologies are often mentioned together even though they perform different jobs.
WebM is a container format. A container organizes media streams and related information into a structure that software can understand. The actual video and audio inside that container can use separate compression technologies.
VP9 is a video codec. Its job is to represent video efficiently so that large amounts of visual information require less data. Opus performs a similar role for audio.
A Container Carries the Media
WebM provides the structure, while codecs such as VP9 and Opus determine how the video and audio streams inside that structure are compressed and decoded.
Better Compression Mattered as Online Video Grew
Internet video continually pushed toward higher resolutions and better image quality. Those improvements also increased the amount of information that had to travel across a network connection.
A more efficient codec can represent comparable visual information using less data than an older approach under suitable conditions. That can reduce the bandwidth required to deliver video or allow improved quality within a similar amount of bandwidth.
VP9 was developed as an open video codec with web delivery as an important use case. Browser support therefore mattered because a codec is only useful to a website when the devices receiving the media know how to decode it.
Compression Affected More Than File Size
For streaming media, efficient compression could influence bandwidth consumption, loading behavior, achievable video quality, and the amount of data a service needed to deliver.
Modern Web Media Needed Efficient Audio Too
Video receives much of the attention in streaming discussions, but the accompanying audio also needs to be encoded and delivered efficiently.
Opus is an audio codec designed to work across a broad range of material and bitrates. It can be used for speech as well as more complex audio, making it useful for different types of internet communication and media.
When combined with VP9 video in a suitable WebM stream, Opus provided the audio side of a modern open-media combination.
Audio and Video Are Usually Separate Streams
A video viewed on a website may contain one codec for the picture and another for the sound even though both arrive together as a single viewing experience.
The Anniversary Update Added the New Formats
In 2016, Microsoft announced support for WebM, VP9, and Opus in Microsoft Edge. The support became part of the stable browser with the Windows 10 Anniversary Update.
The addition meant that Edge could participate in web experiences using these media technologies rather than requiring every service to provide an alternative format specifically because the Microsoft browser lacked support.
For users, the change was largely invisible. There was no need to choose a codec before watching a video. The significance was in what the browser could handle when a compatible website delivered the media.
Browser Features Often Work Quietly
A newly supported media format may not add a visible button or menu. Its value appears when websites can deliver content in a format the browser previously could not use.
Media Source Extensions Helped Video Adapt
The Edge implementation was particularly relevant to websites using Media Source Extensions, commonly abbreviated as MSE.
MSE gives web applications greater control over media playback by allowing JavaScript to provide media segments to the browser. This is useful for sophisticated streaming systems that do not simply download one fixed video file from beginning to end.
A streaming service can divide content into segments and make decisions about which media data to supply as playback continues.
The Stream Could Respond to Conditions
Instead of treating online video as one unchanging file, modern streaming systems could deliver media in pieces and adjust what they supplied during playback.
Adaptive Streaming Helped Video Survive a Changing Network
Internet connections rarely deliver exactly the same performance every second. Available bandwidth can rise or fall as network conditions change.
Adaptive streaming is designed around that reality. A service can maintain different representations of the same content and select an appropriate version as conditions change.
When more bandwidth is available, a higher-quality stream may be practical. If throughput falls, switching to a less demanding representation can help playback continue rather than repeatedly stopping to wait for additional data.
Continuous Playback Can Matter More Than Maximum Quality
A slightly lower-quality segment that arrives on time may provide a better viewing experience than a higher-quality segment that repeatedly causes playback to stop.
A More Efficient Stream Was Not Free to Process
Compression reduces the amount of data needed to represent media, but compressed information must eventually be decoded before it can be displayed or heard.
That work can be performed by software running on the processor or, when the appropriate hardware and software support exist, with assistance from dedicated media-decoding capabilities.
The practical experience therefore depended on more than browser compatibility alone. The computer’s hardware, graphics capabilities, drivers, resolution of the video, and particular media stream could all influence playback efficiency.
Codec Support Did Not Guarantee Identical Performance
Two computers running the same browser could experience the same video differently because decoding capability and available processing resources varied between systems.
Format Support Helped Reduce Compatibility Gaps
A web media format becomes considerably more useful when it works across a broad collection of browsers and devices.
If one major browser lacks support, websites may need to encode and store alternative versions of the same content. They may also need additional logic to determine which version should be sent to each visitor.
Adding WebM, VP9, and Opus support to Edge helped narrow one of those compatibility gaps and gave web developers another browser capable of participating in the growing open-media ecosystem.
Browser Compatibility Affects the Server Too
Supporting more media formats in the browser can give websites greater flexibility when deciding how many encoded versions of their content they need to prepare and deliver.
Users Benefited Without Managing the Format
Many important browser improvements are designed specifically so that users do not have to think about them.
A person visiting a streaming site generally cares about whether the video starts, remains smooth, looks good, and sounds correct. The container and codecs responsible for making that happen can remain completely hidden.
Support for VP9 and Opus represented that kind of improvement. Edge gained additional ways to receive modern web media while the technical decisions could remain between the browser and the website.
The best media compatibility often becomes noticeable only when it is missing.
Edge Became More Fluent in the Language of Web Media
The arrival of WebM, VP9, and Opus support expanded what Microsoft Edge could understand as online video continued moving toward more efficient and adaptable delivery.
VP9 addressed the video stream, Opus provided an efficient option for audio, and WebM supplied a container capable of carrying those media streams. Combined with Media Source Extensions, the technologies supported the increasingly sophisticated way video was being delivered through the web.
For the viewer, the result was straightforward: another major browser had learned how to handle a broader range of modern streaming media without asking the person watching it to understand what was happening underneath.
