# Error h3: Decode in plex-web on iPhone

**URL:** <https://forums.plex.tv/t/error-h3-decode-in-plex-web-on-iphone/800688>\
**Category:** Plex Players\
**Tags:** server-linux, plex-web\
**Created:** [July 14, 2022, 9:02am UTC](https://forums.plex.tv/t/error-h3-decode-in-plex-web-on-iphone/800688 "2022-07-14T09:02:46Z")\
**Posts on this page:** 2\
**Page:** 1

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**Author:** ![klim269](https://avatars.discourse-cdn.com/v4/letter/k/c77e96/32.png) [@klim269](https://forums.plex.tv/u/klim269)\
**Post date:** [July 14, 2022, 9:02am UTC](https://forums.plex.tv/t/error-h3-decode-in-plex-web-on-iphone/800688/1 "2022-07-14T09:02:46Z")

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Server Version#: 1.27.2.5929  
Player Version#: plex for web

I’ve got an issue watching 4K HEVC HDR10 on plex over web on iPhones (I’ve checked it on two different devices with the same result.) Every time I start playing the file, I receive an error message saying “Playback Error; Error code: h3 (Decode)” without starting the video itself.

If I play the same file on another device (iPad) via web - it works. If I play it on TV - it works.  
What may cause such error?

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**Author:** ![system](https://global.discourse-cdn.com/plex/original/3X/2/a/2acb9765406f63293d357b4ec509ec39aa28f2ad.png) [@system](https://forums.plex.tv/u/system)\
**Post date:** [October 12, 2022, 9:03am UTC](https://forums.plex.tv/t/error-h3-decode-in-plex-web-on-iphone/800688/2 "2022-10-12T09:03:18Z")

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