How to stop phone HDR clips making your finished video flash purple
Tell Vizard Agent where you see the purple flashing. It first checks the delivered file is identical to its master, then reads the colour tags on the export and on every source clip. When HDR tags from phone clips have been stamped onto a mixed edit, it converts each shot to standard colour, tags the whole file consistently and scans every frame for magenta.
What do you type into Vizard Agent?
Describe what you saw and ask why, rather than asking for a re-export. A plain re-export keeps whatever went wrong in the first one, while a "why" sends Vizard Agent to the file's own metadata, which is where problems like this usually live.
There is a lot of purple flashing when I play the video. Why is that?
What does Vizard Agent actually do?
It separates "the picture is wrong" from "the picture is labelled wrong". Recent phones record in HDR, and if those clips go into an edit alongside ordinary photos and clips, the export can end up labelled as HDR while holding standard pictures, and players handle that mismatch in different ways. In the session behind this article it:
- Confirmed the uploaded file was byte-identical to its local master, ruling out the upload, and ran a decode looking for errors.
- Read the export's colour tags and found every frame of an ordinary 8-bit file labelled as HDR.
- Probed every source: nine of ten phone clips were 10-bit HDR, one was standard video with a different range, and the photos were standard.
- Rebuilt every shot through a proper conversion to standard colour, with consistent tags at every stage, and compared tone-mapping options on stills, choosing the one that kept the colours natural.
- Decoded all 600 frames and measured strong-magenta pixels per frame, finding no whole-frame flashes, and confirmed the audio was unchanged.
When does this not work well?
When the flashing comes from the player rather than the file. Vizard Agent can make the tags correct and consistent, but it cannot see your device's screen, so watch the new file on the device where you saw the problem. Damaged source clips produce colour glitches that no conversion removes.
Common questions
Why does my video flash purple? Often mismatched HDR tags. Vizard Agent reads and corrects them.
Was it my phone clips? Possibly. Vizard Agent probes every source to find out.
How do I know it is fixed? Vizard Agent scans every frame, but check on your own device too.