hls.js 1.6.16 · measured in this browser
WAITING FOR A LINK
Paste a delivery link and accept the terms to start.
LIVE · measuring
Your delivery
Serving via—01 / STRUCTURE
The full pre-flight measurement every parameter, with its source
02 / PLAYBACK
Your stream, playing here
One real session in this browser. It starts on its own; the simulation waits for its button.Stream & codec details
VERDICT
03 / THE RUN
A known sequence of impairments at known times
04 / THE RESPONSE
What the delivery did, on the same clock
Throughput, buffer health and per-chunk bitrate — drawn where they were taken, not resampled.
Throughput
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source: —
Buffer health
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source: —
Bitrate per chunk
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source: —
05 / THE REPORT
CMCD — what this player tells the CDN
CTA-5004 · v1 · query mode?CMCD= · hls.js 1.6.16
waiting…
Last payload on the wire
waiting for the first request…
Live CDN timeline
Which CDN served each segment
Serving CDN resolving…DNS & host behaviour
Current host resolving…Host per segment — a colour change is a new hostname; the marks below are host / CDN changes
| host | CDN the viewer got | attributed via | CDN our server would get | segments | transport | DNS lookups | reused | median DNS | timings |
|---|
Recent segments (network waterfall)
Live event log
Advanced diagnostics
Manual impairment operator escape hatch · exact figures, applied to the network
NETWORK IMPAIRMENT
Exact figures, applied to the network and felt through the buffer. Nothing here flushes the buffer or freezes the picture.
kbps
0 = uncapped. Applied as one shared link, so parallel fragments share it.
ms
Delay before each fragment request starts.
%
Fragments dropped; hls.js retries, so this shows as jitter.
Presets fill the fields:
No impairment — delivery is untouched.
Per-segment network DevTools-grade waterfall · newest first
Throughput (Mbps)—
Buffer health (s)—
| # | clock | rendition | CDN | POP | size | TTFB | dl | Mbps | status | cache | proto |
|---|
Stream & codec details VLC-style media information
| # | bitrate | avg | resolution | fps | video | range | audio | container | CDN |
|---|
ABR ladder & switch history
Ladder (active highlighted)
Recent switches
Manifest inspector raw playlists + parsed tags
Master playlist
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Current media playlist
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Anything we should measure that we did not?
Video Deliver Diagnostic
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