Chromecast with google tv stutter

[TheDreadPirate]

First tip, on your CCwGTV, manually set the global bit rate to 120Mbps. Something something the auto setting is bugged doesn't get it right sometimes. I am seeing "TranscodeReason=ContainerBitrateExceedsLimit" probably due to that. Unnecessary transcoding

Second, when you are transcoding it is fast enough for a two 4K transcode streams. Both for lower the bit rate (above) and for compatibility reasons.

Third, I see you starting and stopping The Da Vinci Code a lot. That one is direct playing. Probably other videos, too. Not sure what is going on there. In Android TV there is a debug options. I think it gives you the option to write logs to the server? And more options? Check that out.

I see the 6700XT in the logs. What kind of CPU is in your server?
Fourth, probably not a big deal, upgrade to 10.8.10? You're on .9. There was an important security patch in .10. Slightly newer ffmpeg.