MediaSource timer-throttling / Energy Saver test

Plays a fragmented MP4 through MediaSource and appends the next segment from a JS timer, mimicking a player that polls playback progress and fetches segments. When that timer is throttled to 1 Hz (fullscreen video + Energy Saver with ThrottleFullscreenVideoActiveTab, or simply a backgrounded tab), watch whether the buffer keeps up or the video rebuffers. See the comment at the top of this file for setup details.

Engine Media URL (MP4 fragment, or HLS .m3u8 / DASH .mpd) Buffering driver Timer interval (ms) Target buffer ahead (s) Fragments/append (segment size) muted (allows autoplay)

idle

JS timer probe (1 Hz?)

–

Buffering driver

–

Timer interval (req / actual)

–

Timer ticks

Segment appends

currentTime

0.00 s

Buffered ahead of playhead

0.00 s

readyState

–

Rebuffering events

Total stalled time

0.00 s

rAF frame rate

–