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[Beta] Video preview - Playing failed: Class not registered
Posted: 04 Jul 2026 12:49
by bobfleming
I can open a video fine, but the preview shows a still image and below that, the attached error.
Any ideas?
Re: [Beta] Video preview - Playing failed: Class not registered
Posted: 04 Jul 2026 13:49
by phred
What version of XY?
What version of Windows?
What file format?
Re: [Beta] Video preview - Playing failed: Class not registered
Posted: 04 Jul 2026 14:28
by bobfleming
Sorry, will try to provide less info next time :/
Win 11
XYP 28.30.1309
File format: mp4
Re: [Beta] Video preview - Playing failed: Class not registered
Posted: 05 Jul 2026 10:33
by admin
That's a rare error, but it probably means that you're missing some codec.
This script will provide additional insight:
Code: Select all
text get("previewhandler", "mp4");
Re: [Beta] Video preview - Playing failed: Class not registered
Posted: 05 Jul 2026 15:05
by bobfleming
Returns "No preview handler found for mp4 files." Re codec presence, videos play in windows media player.
Re: [Beta] Video preview - Playing failed: Class not registered
Posted: 06 Jul 2026 08:54
by admin
Is that a new problem?
Re: [Beta] Video preview - Playing failed: Class not registered
Posted: 06 Jul 2026 09:12
by bobfleming
Can't say either way.
Re: [Beta] Video preview - Playing failed: Class not registered
Posted: 06 Jul 2026 09:14
by admin
Untick "Configuration | Preview | Preview | Audio/Video preview | Use native handling in the preview pane" and try to play the video in the Preview Pane (Ctrl+F11).
Re: [Beta] Video preview - Playing failed: Class not registered
Posted: 06 Jul 2026 09:15
by bobfleming
Makes no difference.
Re: [Beta] Video preview - Playing failed: Class not registered
Posted: 06 Jul 2026 09:21
by admin
Out of ideas for now.
Re: [Beta] Video preview - Playing failed: Class not registered
Posted: 06 Jul 2026 20:01
by Horst
Install the K-Lite Codec Pack (Standard)
and it will play mp4 with any software.