Video Error Checker – Detect & Fix Video Playback Errors

Paste any video URL and let VideoLab's error checker identify the problem. Detects CORS failures, network errors, codec incompatibilities, unsupported formats, and referrer blocks — with specific fix suggestions for each.

Other Tools:HLS MP4 DASH YouTube Vimeo

Active format: HLS

Space K M F

0:00 / 0:00

Debug Panel

Idle

Events logged: 0

Errors: 0

Playback

Autoplay

Muted

Plays Inline

Gather info before playback

Runs a HEAD/GET prefetch to inspect HTTP status & Content-Type before the player starts

Referrer Policy

Send Referrer

Note:Browsers don't allow JavaScript to set custom HTTP headers on video requests. Full header control requires a server-side proxy.

Preload Strategy

Only load duration/dimensions (default)

How VideoLab Works

Three steps to test and debug any video stream

Paste a URL or Upload a File

Drop a link or drag a file right into the player. We'll detect the format and start loading the video.

Watch Diagnostics Update Live

As the video plays, the debug panel tracks the connection status, resolution, bitrate, and network events as they happen.

Share or Export Your Logs

Generate a shareable URL to let someone else see your exact test environment, or download a JSON debug log to review later.

Common Video Error Codes Explained

HTML5 video has 4 error codes: MEDIA_ERR_ABORTED (1) — user stopped, MEDIA_ERR_NETWORK (2) — network failure, MEDIA_ERR_DECODE (3) — decode failed, MEDIA_ERR_SRC_NOT_SUPPORTED (4) — format not supported. VideoLab maps each to a human-readable description and a fix.