You call mediaSource.addSourceBuffer(mimeType) to declare what codec format you’ll be feeding the buffer.
Most userland implementations of custom ReadableStream instances do not typically bother with all the ceremony required to correctly implement both default and BYOB read support in a single stream – and for good reason. It's difficult to get right and most of the time consuming code is typically going to fallback on the default read path. The example below shows what a "correct" implementation would need to do. It's big, complex, and error prone, and not a level of complexity that the typical developer really wants to have to deal with:
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ВСУ запустили «Фламинго» вглубь России. В Москве заявили, что это британские ракеты с украинскими шильдиками16:45
2026-02-28 00:00:00:03014271610http://paper.people.com.cn/rmrb/pc/content/202602/28/content_30142716.htmlhttp://paper.people.com.cn/rmrb/pad/content/202602/28/content_30142716.html11921 彭清华会见老挝和平与团结委员会考察团，这一点在WPS官方版本下载中也有详细论述
The Sentry intercepts the untrusted code’s syscalls and handles them in user-space. It reimplements around 200 Linux syscalls in Go, which is enough to run most applications. When the Sentry actually needs to interact with the host to read a file, it makes its own highly restricted set of roughly 70 host syscalls. This is not just a smaller filter on the same surface; it is a completely different surface. The failure mode changes significantly. An attacker must first find a bug in gVisor’s Go implementation of a syscall to compromise the Sentry process, and then find a way to escape from the Sentry to the host using only those limited host syscalls.
“比如我正常应该是120kw充电，但只要车辆一多，就会明显下降，甚至只剩45kw。”小德坦言，不过好在数量多，每个服务区都有，充的频繁一些也可以满足需要。，这一点在safew官方版本下载中也有详细论述