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VLC is a software decoding player it can bypass any quirks or oddities in the video, hardware decoding players like most of your playback clients cannot bypass such things or have very little leeway in this area.
The optimizer converts the video into another format, making a hidden shadow copy of the video that is then fed to the Plex client.
It definitely sounds like the tuneskit software is the cause to me. As to rectifying that well that's tricky, you could try contacting the tuneskit people but they may say nothing, you could try running the M4V files it outputs through MKVtoolnix and remux the video into an MKV container, it's a longshot but sometimes MKVtoolnix can detect errors in the source video/container and correct them.
Other than that you need someone who understands video internals a great deal particularly Apple encoded ones. MrMC is a AppleTV fork of Kodi made by one of the former main devs of XBMC (now Kodi), Davilla responds to support requests on their forum, try playing the video in MrMC (which has built in Plex support) and see if it stutters, then post with logs from MrMC, tell them the video source, tuneskit etc. At best they may be able to make MrMC play it or how to correct the video. |
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