Why is plex transcoding this Optimized video file for Chromecast Ultra

[goran_hinic]

Hi all,
I’m trying to make Plex work on my older machine. It should still work fine AMD FX-8350, 16GB of RAM.
I have a video file that I optimized overnight - I used original quality expecting that Plex will adjust the format and container, hoping for Direct play, but when I cast it to my CC Ultra, it starts as direct play, in dashboard, but then immediately switches to transcode.
I updated the XML file (bellow). This is the file info from MediaInfo:

I am very new to all this, so please have patience and let me know what else to provide.
Thank you!

Here is XML

<?xml version="1.0" encoding="utf-8"?>
<Client name="Chromecast">
  <!-- Author: Plex Inc. -->
  <!-- Updated for Chromecast Ultra by ambroisemaupate. -->
  <TranscodeTargets>
    <VideoProfile protocol="http" container="mkv" context="streaming" />
    <MusicProfile container="mkv" codec="opus" />
    <PhotoProfile container="jpeg" />
    <SubtitleProfile container="ass" codec="ass" />
  </TranscodeTargets>
  <DirectPlayProfiles>
    <VideoProfile container="mkv" codec="mpeg1video,mpeg2video,mpeg4,h264,vp8,vp9,Hevc,h265" audioCodec="eac3,ac3,dca,aac,mp2,mp3,pcm" subtitleFormat="srt,ass" />
    <VideoProfile container="mp4,webm" codec="h264,mpeg4,Hevc,h265,vp8,vp9" audioCodec="eac3,ac3,dca,aac,mp2,mp3,pcm" subtitleFormat="srt,ass" />
    <MusicProfile container="mp3" codec="mp2,mp3" />
    <MusicProfile container="mp4" codec="eac3,ac3,dca,aac,mp2,mp3,pcm" />
    <MusicProfile container="flac" codec="flac" />
    <MusicProfile container="ogg" codec="vorbis" />
    <PhotoProfile container="jpeg,gif,webp,png" />
    <SubtitleProfile container="ass" codec="ass" />
    <SubtitleProfile container="srt" codec="srt" />
  </DirectPlayProfiles>
  <CodecProfiles>
    <VideoCodec name="h265,Hevc,vp9">
      <Limitations>
        <UpperBound name="video.width" value="3840"/>
        <UpperBound name="video.height" value="2176"/>
		    <UpperBound name="video.bitrate" value="75000"/>
      </Limitations>
    </VideoCodec>
    <VideoCodec name="h264,mpeg4">
      <Limitations>
        <UpperBound name="video.width" value="3840"/>
        <UpperBound name="video.height" value="2176"/>
        <UpperBound name="video.bitrate" value="75000"/>
		    <UpperBound name="video.bitDepth" value="10" />
        <UpperBound name="video.level" value="42" />
      </Limitations>
    </VideoCodec>
    <VideoAudioCodec name="mp3">
      <Limitations>
        <UpperBound name="audio.channels" value="2" />
      </Limitations>
    </VideoAudioCodec>
    <VideoAudioCodec name="aac">
      <Limitations>
        <UpperBound name="audio.channels" value="2" />
      </Limitations>
    </VideoAudioCodec>
    <VideoAudioCodec name="ac3">
      <Limitations>
        <UpperBound name="audio.channels" value="6" />
      </Limitations>
    </VideoAudioCodec>
    <VideoAudioCodec name="eac3">
      <Limitations>
        <UpperBound name="audio.channels" value="6" />
      </Limitations>
    </VideoAudioCodec>
    <VideoAudioCodec name="dca">
      <Limitations>
        <UpperBound name="audio.channels" value="6" />
      </Limitations>
    </VideoAudioCodec>
  </CodecProfiles>
</Client>

[mod-edit: fixed xml formatting]

Server Version#: 1.28.2.6151
Player Version#:

[tom80H]

Not an expert with those devices… from what a quick google search found, the CC Ultra might not like h264 videos above 1080p (that is unless I’m misinterpreting the Google documentation… and I’m not sure I do read it right).

Supported Media for Google Cast  |  Google Developers

[OttoKerner]

Avoid resolutions above 1920x1080 pixels with the AVC/H.264 video codec.
Avoid any other audio channel configuration than stereo with the AAC audio codec.

[goran_hinic]

Thank you for the replies! I made a mistake believing that Chromecast Ultra will be a better solution for casting than my built in Vizio casting device. I kept trying making it work on CCU, and before I absolutely gave up, I used TVs remote and selected the movie from PLEX app on the TV, worked with the original file, so .h265 4K HDR without the need to transcode. CCU doesn’t support this. I am seriously disappointed because I assumed, and this is completely my fault, that CCU will be more versatile and flexible. It is not.
After reading video options they support, I don’t understand why would anyone choose this device over Roku, for example.

Thanks again for your replies!