It does not work .The function :Inspect the video from left menu bar - media assets.

[comfy-pr-bot]

Custom Node Testing

• I have tried disabling custom nodes and the issue persists (see how to disable custom nodes if you need help)

Expected Behavior

When I click the inspect button, it should play video in the middle of the screen.

Actual Behavior

When I click the inspect button, it shows the video player but no video plays.

Steps to Reproduce

generate a video. then click the inspect button from left menu bar - media assets.

Debug Logs

null

Other

No response

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This issue is transferred from: comfyanonymous/ComfyUI#11115

Original issue was created by @wendaleruan at 2025-12-05T08:52:46.000Z

┆Issue is synchronized with this Notion page by Unito

[dosubot]

The inspect feature in the media assets sidebar opens a gallery dialog that displays videos using a standard HTML <video> element, sourcing the video from the asset's preview_url. If the video player appears but doesn't play, the most common causes are: the preview_url is missing or invalid, the video format or codec isn't supported by your browser, or browser autoplay policies are blocking playback. This matches the behavior you described—player at 0:00, no playback, and no debug logs.

To troubleshoot: check your browser's developer console and network tab for errors or failed requests when you click the inspect button. Look for missing files, CORS issues, or MIME/type errors. Confirm the video format and codec (VP9 or H.264 in .mp4/.webm are safest; AV1 and some .mov/.avi files may not play in all browsers) [source] [source]. Try a different browser to rule out browser-specific issues. If you see errors or the video format is unsupported, try regenerating the video with a supported codec.

If the issue persists, sharing screenshots or logs from the browser console/network tab will help pinpoint the problem.

To reply, just mention @dosu.

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