Playback / signal integrity
Transcoding re-encodes the file in real time before it reaches your screen — it costs server CPU, adds delay, and quietly drops quality. Direct Play sends the original file straight through. One setting change per device gets you there.
Every Plex app has a video quality control. Set it to whichever of these it offers — they all mean the same thing: play the file as-is.
OriginalRoku's app defaults to a capped bitrate — this is the step people miss most often.
MaximumApple TV hardware decodes almost everything natively — this device rarely needs to transcode.
OriginalSet both — Plex applies separate quality caps for home Wi-Fi vs. remote/cellular.
MaximumSame dual home/remote split as iOS — check both entries.
OriginalIf casting from a phone instead of the native app, set quality on the phone app — it controls the stream.
MaximumOlder Fire Stick (1st/2nd gen) hardware is weak — expect some transcodes on 4K HDR content regardless of this setting.
OriginalBrowsers can't decode every codec — HEVC/4K files may transcode here even at this setting. Use the app instead if available.
OriginalMost reliable Direct Play surface next to Apple TV — full local codec support.
Direct Stream is fine — audio or subtitles are being remuxed, not the video. Only Transcode means the video itself is being re-encoded.