Demo pages for testing Gcore Video Streaming and JavaScript video player behavior
Player Lab

Test Your Stream

Paste any HLS (.m3u8), MPEG-DASH (.mpd), or MP4 URL to load it in the Gcore player. Live and VOD streams are both supported. All stats, events, and quality data update in real time via player plugins.

Override options

Changes take effect after pressing Load / Reload.

Controls CMCD query parameters on player requests.
Override only for CDN URLs without a clear extension.
Set to Live for DVR controls and live-edge seeking.
Higher delay = more buffer cushion for encoder irregularities (e.g. loop stitching) at the cost of latency. Applies to DASH and HLS; ignored for MP4. Reloads the stream.
Enables console logs for diagnosing playback. DASH.js debug uses logLevel 5.
Limits dash.js live catch-up speed. Lower values reduce post-stall buffer drain.
LoL+ is designed for low-latency streams and uses buffer level in rate decisions.
Prevents catch-up from accelerating while the forward buffer is too thin.
Enter a stream URL above and click Load

Player actions (remote control)

00:00:00 UTC
Codec
Resolution

Quality & stream info

Format: —
Engine: —
Level: —
Quality: —
Resolution: —
Bitrate: —
Codec: —

Last requests:

Statistics

Bandwidth (est.) —
FPS —
Position / Duration —
Session Time —
Buffer Level —
Video Buffer —
Audio Buffer —
Dropped Frames —

Player event log

Plugins active:

PluginDescription
BigMuteButtonProminent unmute overlay for muted autoplay
ClapprStatsPlayback quality metrics at 1 s intervals (buffer, bandwidth, fps, dropped frames)
ClosedCaptionsSubtitles and captions selector for streams with text tracks
CmcdConfigAttaches CMCD session metadata to every media request
DvrControlsShows live / DVR state for live streams
ErrorScreenOverlay for fatal playback errors
MediaControlMain player control bar and interaction layer
QualityLevels Manual quality selection via the gear menu. Configured with codecStrategy: 'best-supported' — picks the highest-compression codec the browser can play (AV1 → HEVC → H.264). The default 'power-efficient' instead picks the codec the browser reports as hardware-accelerated.
SourceControllerPredictable source reloading and failover
SpinnerBuffering / loading indicator

Events: ready, play, pause, stop, ended, seek, volumeupdate, fullscreen, error, and timeupdate drive the controls, stat cards, and log.