"h4 (Not Supported)" with 4K x265 HDR video files on Chromecast Ultra

[King_Mustard]

The issue is related to the 7.1 AAC stream in the files. 5.1 AAC is fine. It appears to be a Chromecast Ultra issue that has existed since at least summer 2019, so I doubt it will be fixed.

Chromecast AAC 7.1 stopped working (AAC 5.1 works)

Server Version#: 1.16.1.1291 Player Version#: iOS 5.17 Chromecast Firmware: 1.40.156414 Something happened: Chromecast stopped working with AAC 7.1 videos. AAC 5.1 works. AC3 5.1 or 7.1 works. But AAC 7.1 fail with “Error: h4 (not supported)” error on Chromecast. This just started happening within the last few weeks - Plex App update? We watched two AAC 7.1 movies just last month without issues. Now they won’t play anymore with said error. How did it just stop working? Why does 5.1 work? C…