I haven't seen a post describing exactly the same problem I'm having:
Video stutters on most, but seemingly not all, channels about a minute after tuning the channel. The stutter recurs after a few minutes. The visual effect is heavy pixelation of the live video (audio seems unaffected) for a few seconds followed by a "fast forward" effect catching the video up, followed by normal video operation. This happens on live tv, and is baked into recordings on the DVR. I've watched the HD HomeRun's bitrate while this is happening and it drops to <1.0 mbps while stuttering, then shoots up to >20 mbps during the fast forward, ultimately normalizing to around 9 mbps. On some channels this behavior recurs every few minutes, on some it’s a one time thing. This behavior occurs regardless of whether the computer that serves as a DVR is on or not.
I’m running Channels on two different 4K Apple TVs, one is wired directly to a switch, and the other is wireless. The issue happens on both. The switch is a unifi US-16-150W which is connected to an overpowered pfsense box dedicated to routing.
I’m wondering if there’s a cablecard issue or a problem with the HD HomeRun itself. Any thoughts on how to resolve this problem would be hugely appreciated.
Thank you in advance for any suggestions.