The old informs the new
// Write data — backpressure is enforced
，这一点在搜狗输入法下载中也有详细论述
For our purposes, we don’t even need to chase it all the way to raw PCM which is valid avenue albeit in the realm of WEBRips and not defacto “downloaders.” We just need to find the last point in the pipeline where data is still accessible to JavaScript and that point is the MediaSource Extensions API, specifically the SourceBuffer.appendBuffer() method.
Reply to: Limitations of probing field-induced response with STM