Is this only for HLS?

Playlist analysis targets HLS (.m3u8). Playback uses the same player stack as /watch. For MPEG-DASH, use the DASH / MPD Checker tool.

Why does Analyze fail but the player works?

Analyze runs fetch() from this origin. Some CDNs allow segment CORS for players but block manifest reads, or the opposite. Try fullscreen player or test from your own domain.

No. Everything runs in your browser except optional “explain error” which sends a short text to our API.

Free tool by DCAST

Stream Lab

One tool for HLS: manifest analysis, variant table, embedded player, and live playback telemetry — buffer, latency, codecs, and bitrate.

Stream URL

Paste HTTPS M3U8 (or any URL to probe)

Health

Get started

Paste an HTTPS manifest, analyze it, then play — playback stats appear in the right column.

Playback telemetry

From Video.js / VHS while the player runs (right-click the player → Stats for overlay on video).

Start playback in the player. Metrics appear here every second.

What does Stream Lab do?

Stream Lab merges link check, health summary, and playlist inspection into one layout: analyze the manifest, read variant bandwidths and URIs, then watch the same URL in the embedded player while telemetry streams to the side panel. Share links embed a snapshot of the last analysis (`?r=`).

Q:Is this only for HLS?: A:Playlist analysis targets HLS (.m3u8). Playback uses the same player stack as /watch. For MPEG-DASH, use the DASH / MPD Checker tool.
Q:Why does Analyze fail but the player works?: A:Analyze runs fetch() from this origin. Some CDNs allow segment CORS for players but block manifest reads, or the opposite. Try fullscreen player or test from your own domain.
Q:Do you store my URL?: A:No. Everything runs in your browser except optional “explain error” which sends a short text to our API.

All tools · HLS Player (minimal) · HLS Live Pulse · Why won't it play? · Start free

Stream Lab

Stream URL

Health

Playback telemetry

What does Stream Lab do?

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Stream Lab

Stream URL

Health

Playback telemetry

What does Stream Lab do?