HDR lost on MKV --> M4V Direct Stream

[mbnwa 49]

Is there anyway to retain the HDR meta data when direct streaming a container switch from MKV -> M4V? Currently on my Apple TV (4K) if I remux the MKV to MP4 I get HDR however I am trying to retain Dolby Atmos for the future so I am using MKV. 

 

EDIT: As the post below shows Emby is doing a full transcode for some reason, Emby should do a direct stream remux vs a full on transcode.

 

Thanks

Edited January 9, 2018 by mbnwa

[mbnwa 49]

OK it seems that this is getting transcoded not direct streamed, not sure why that would be the case as the HEVC and AC3 streams should be supported only the container is not supported. (This is while selecting the AC3 track not TrueHD track)

 

2018-01-08 19:39:40.470 Info App: User policy for XXXXXXXXXXXX. EnablePlaybackRemuxing: True EnableVideoPlaybackTranscoding: True EnableAudioPlaybackTranscoding: True

2018-01-08 19:39:40.470 Info App: Profile: Unknown Profile, Path: \\192.168.50.10\Media Storage\Movies\Deadpool\Deadpool (4K UHD).mkv, isEligibleForDirectPlay: True, isEligibleForDirectStream: True
2018-01-08 19:39:40.470 Info App: Profile: Unknown Profile, No direct play profiles found for Path: \\192.168.50.10\Media Storage\Movies\Deadpool\Deadpool (4K UHD).mkv
2018-01-08 19:39:40.470 Info App: RemoteClientBitrateLimit: 20000000, RemoteIp: 192.168.50.80, IsInLocalNetwork: True
2018-01-08 19:39:40.470 Info App: Profile: Unknown Profile, Path: \\192.168.50.10\Media Storage\Movies\Deadpool\Deadpool (4K UHD).mkv, isEligibleForDirectPlay: True, isEligibleForDirectStream: True
2018-01-08 19:39:40.470 Info App: Profile: Unknown Profile, No direct play profiles found for Path: \\192.168.50.10\Media Storage\Movies\Deadpool\Deadpool (4K UHD).mkv
2018-01-08 19:39:40.470 Info App: RemoteClientBitrateLimit: 20000000, RemoteIp: 192.168.50.80, IsInLocalNetwork: True
2018-01-08 19:39:40.470 Info App: Profile: Unknown Profile, Path: \\192.168.50.10\Media Storage\Movies\Deadpool\Deadpool (4K UHD).mkv, isEligibleForDirectPlay: True, isEligibleForDirectStream: True
2018-01-08 19:39:40.470 Info App: Profile: Unknown Profile, No direct play profiles found for Path: \\192.168.50.10\Media Storage\Movies\Deadpool\Deadpool (4K UHD).mkv
2018-01-08 19:39:40.470 Info App: RemoteClientBitrateLimit: 20000000, RemoteIp: 192.168.50.80, IsInLocalNetwork: True
2018-01-08 19:39:40.471 Info HttpServer: HTTP Response 200 to 192.168.50.80. Time: 5ms. http://192.168.50.10:8096/emby/Items/fdfbeab9812d77a39be3219e45633a4b/PlaybackInfo?UserId=66f17f239d9172dd0aef9b4f6743c04c&StartTimeTicks=0&AutoOpenLiveStream=true&MaxStreamingBitrate=140000000
2018-01-08 19:39:40.472 Info HttpServer: HTTP GET http://192.168.50.10:8096/emby/Users/66f17f239d9172dd0aef9b4f6743c04c/Items?recursive=true&limit=4&includeItemTypes=Movie&filters=IsUnplayed&sortBy=DateCreated&sortOrder=Descending. UserAgent: Emby/3 CFNetwork/893.14 Darwin/17.4.0
2018-01-08 19:39:40.505 Info HttpServer: HTTP Response 200 to 192.168.50.80. Time: 33ms. http://192.168.50.10:8096/emby/Users/66f17f239d9172dd0aef9b4f6743c04c/Items?recursive=true&limit=4&includeItemTypes=Movie&filters=IsUnplayed&sortBy=DateCreated&sortOrder=Descending
2018-01-08 19:39:40.795 Info HttpResultFactory: Transmit file S:\Mediabrowser\transcoding\transcoding-temp\ac627edf5f4535e0eef2bf5d0984f39320.ts
2018-01-08 19:39:40.797 Info HttpServer: HTTP Response 500 to 192.168.50.80. Time: 765ms. http://192.168.50.10:8096/emby/videos/fdfbeab9812d77a39be3219e45633a4b/hls1/main/20.ts?DeviceId=B1C0DE9E-97E7-495F-BA29-6AB45B941382&MediaSourceId=fdfbeab9812d77a39be3219e45633a4b&VideoCodec=h264&AudioCodec=ac3,aac,mp3&AudioStreamIndex=2&VideoBitrate=139616000&AudioBitrate=384000&MaxAudioChannels=6&MaxWidth=3840&PlaySessionId=e117c43679954da99661b00873c06f7c&CopyTimestamps=false&EnableSubtitlesInManifest=true&Tag=5865b6669dc90c1d4a0af916cb312190&RequireAvc=false&RequireNonAnamorphic=false&SegmentContainer=ts&BreakOnNonKeyFrames=True&TranscodeReasons=ContainerNotSupported,VideoCodecNotSupported,AudioCodecNotSupported&h264-profile=high,main,baseline,constrainedbaseline&h264-deinterlace=true&h264-level=42

 

     

 

 

The following is the same MKV converted to M4V it looks like "Codec Tag" was added would that cause this issue? In addition the bitrates seem to be different but no transcoding was done just remux into M4V container. The below will direct play with out issues.

 

Edited January 9, 2018 by mbnwa

[Guest asrequested]

Apple TV doesn't support them.

 

https://www.apple.com/apple-tv/specs/

 

[mbnwa 49]

Apple TV does not support what? I have shown if it's in m4v it works as expected however it does not work as expected in MKV where Emby should do on the fly direct stream (remux) from MKV to M4V leaving the audio and video alone. (I am also talking about Apple TV 4K)

 

https://www.apple.com/apple-tv-4k/specs/

Edited January 9, 2018 by mbnwa

[Guest asrequested]

Apple TV does not support what? I have shown if it's in m4v it works as expected however it does not work as expected in MKV where Emby should do on the fly direct stream (remux) from MKV to M4V leaving the audio and video alone. (I am also talking about Apple TV 4K)

 

 

I was just going to ask about that. So then you should post the transcode log. That will tell us what's happening

[Guest asrequested]

But it still looks like TrueHD/Atmos isn't supported

[mbnwa 49]

It's not however that's not the stream I am selecting, I am selecting 5.1 AC3 stream - Apple will be releasing an update later to add Atmos support based on it's release notes. 

 

Transcode Log:

2018-01-08 20:29:57.698

Application version: 3.2.60.0

 

http://192.168.50.10:8096/emby/videos/fdfbeab9812d77a39be3219e45633a4b/hls1/main/0.ts?DeviceId=B1C0DE9E-97E7-495F-BA29-6AB45B941382&MediaSourceId=fdfbeab9812d77a39be3219e45633a4b&VideoCodec=h264&AudioCodec=ac3,aac,mp3&AudioStreamIndex=2&VideoBitrate=139616000&AudioBitrate=384000&MaxAudioChannels=6&MaxWidth=3840&PlaySessionId=b9728acdc2eb4e0dbda2cc6c6c0885d5&api_key=feefc10ebb72450e9a9e400222931e56&CopyTimestamps=false&EnableSubtitlesInManifest=true&Tag=5865b6669dc90c1d4a0af916cb312190&RequireAvc=false&RequireNonAnamorphic=false&SegmentContainer=ts&BreakOnNonKeyFrames=True&TranscodeReasons=ContainerNotSupported,VideoCodecNotSupported,AudioCodecNotSupported&h264-profile=high,main,baseline,constrainedbaseline&h264-deinterlace=true&h264-level=42

 

{"Protocol":"File","Id":"fdfbeab9812d77a39be3219e45633a4b","Path":"S:\\Media Storage\\Movies\\Deadpool\\Deadpool (4K UHD).mkv","Type":"Default","Container":"mkv,webm","Name":"Deadpool (4K UHD).mkv","IsRemote":false,"ETag":"5865b6669dc90c1d4a0af916cb312190","RunTimeTicks":64862400512,"ReadAtNativeFramerate":false,"IgnoreDts":false,"IgnoreIndex":false,"GenPtsInput":false,"SupportsTranscoding":true,"SupportsDirectStream":true,"SupportsDirectPlay":true,"IsInfiniteStream":false,"RequiresOpening":false,"RequiresClosing":false,"SupportsProbing":true,"RequiresLooping":false,"VideoType":"VideoFile","MediaStreams":[{"Codec":"hevc","Language":"eng","TimeBase":"1/1000","CodecTimeBase":"1001/24000","DisplayTitle":"4K HEVC","IsInterlaced":false,"BitRate":51141683,"RefFrames":1,"IsDefault":false,"IsForced":false,"Height":2160,"Width":3840,"AverageFrameRate":23.9760246,"RealFrameRate":23.9760246,"Profile":"Main 10","Type":"Video","AspectRatio":"16:9","Index":0,"IsExternal":false,"IsTextSubtitleStream":false,"SupportsExternalStream":false,"PixelFormat":"yuv420p10le","Level":153,"IsAnamorphic":false},{"Codec":"truehd","Language":"eng","TimeBase":"1/1000","CodecTimeBase":"1/48000","Title":"Surround 7.1","DisplayTitle":"Eng TRUEHD 7.1 Default","IsInterlaced":false,"ChannelLayout":"7.1","BitDepth":24,"Channels":8,"SampleRate":48000,"IsDefault":true,"IsForced":false,"Type":"Audio","Index":1,"IsExternal":false,"IsTextSubtitleStream":false,"SupportsExternalStream":false,"Level":0,"IsAnamorphic":false},{"Codec":"ac3","Language":"eng","TimeBase":"1/1000","CodecTimeBase":"1/48000","Title":"Surround 5.1","DisplayTitle":"Eng Dolby Digital 5.1","IsInterlaced":false,"ChannelLayout":"5.1","BitRate":640000,"Channels":6,"SampleRate":48000,"IsDefault":false,"IsForced":false,"Type":"Audio","Index":2,"IsExternal":false,"IsTextSubtitleStream":false,"SupportsExternalStream":false,"Level":0,"IsAnamorphic":false},{"Codec":"ac3","Language":"eng","TimeBase":"1/1000","CodecTimeBase":"1/48000","Title":"Stereo","DisplayTitle":"Eng Dolby Digital stereo","IsInterlaced":false,"ChannelLayout":"stereo","BitRate":224000,"Channels":2,"SampleRate":48000,"IsDefault":false,"IsForced":false,"Type":"Audio","Index":3,"IsExternal":false,"IsTextSubtitleStream":false,"SupportsExternalStream":false,"Level":0,"IsAnamorphic":false},{"Codec":"ac3","Language":"eng","TimeBase":"1/1000","CodecTimeBase":"1/48000","Title":"Stereo","DisplayTitle":"Eng Dolby Digital stereo","IsInterlaced":false,"ChannelLayout":"stereo","BitRate":224000,"Channels":2,"SampleRate":48000,"IsDefault":false,"IsForced":false,"Type":"Audio","Index":4,"IsExternal":false,"IsTextSubtitleStream":false,"SupportsExternalStream":false,"Level":0,"IsAnamorphic":false},{"Codec":"PGSSUB","Language":"eng","TimeBase":"1/1000","CodecTimeBase":"0/1","DisplayTitle":"Eng","IsInterlaced":false,"IsDefault":false,"IsForced":false,"Type":"Subtitle","Index":5,"IsExternal":false,"IsTextSubtitleStream":false,"SupportsExternalStream":false,"Level":0,"IsAnamorphic":false}],"Formats":[],"Bitrate":51141683,"RequiredHttpHeaders":{}}

 

User policy for XXXXXXXXXXXXXXXXXXXXXX: EnablePlaybackRemuxing: True EnableVideoPlaybackTranscoding: True EnableAudioPlaybackTranscoding: True

 

C:\Users\XXXXXXXXXXXXXXXXXXXXXX\AppData\Roaming\MediaBrowser-Server\system\ffmpeg.exe -f matroska,webm -i file:"S:\Media Storage\Movies\Deadpool\Deadpool (4K UHD).mkv" -threads 0 -map 0:0 -map 0:2 -map -0:s -codec:v:0 libx264 -vf "scale=trunc(min(max(iw\,ih*dar)\,3840)/2)*2:trunc(ow/dar/2)*2" -pix_fmt yuv420p -preset veryfast -crf 18 -maxrate 102283366 -bufsize 204566732 -profile:v high -level 4.1 -x264opts:0 subme=0:me_range=4:rc_lookahead=10:me=dia:no_chroma_me:8x8dct=0:partitions=none -force_key_frames "expr:if(isnan(prev_forced_t),eq(t,t),gte(t,prev_forced_t+3))" -copyts -vsync -1 -codec:a:0 ac3 -ac 6 -ab 384000  -f segment -max_delay 5000000 -avoid_negative_ts disabled -map_metadata -1 -map_chapters -1 -start_at_zero -segment_time 3  -individual_header_trailer 0 -segment_format mpegts -segment_list_type m3u8 -segment_start_number 0 -segment_list "S:\Mediabrowser\transcoding\transcoding-temp\0ea1665e3cdafef049ddc0594ebf69d1.m3u8" -y "S:\Mediabrowser\transcoding\transcoding-temp\0ea1665e3cdafef049ddc0594ebf69d1%d.ts"

 

ffmpeg version 3.4.1 Copyright © 2000-2017 the FFmpeg developers

  built with gcc 7.2.0 (GCC)

  configuration: --enable-gpl --enable-version3 --enable-sdl2 --enable-bzlib --enable-fontconfig --enable-gnutls --enable-iconv --enable-libass --enable-libbluray --enable-libfreetype --enable-libmp3lame --enable-libopenjpeg --enable-libopus --enable-libshine --enable-libsnappy --enable-libsoxr --enable-libtheora --enable-libtwolame --enable-libvpx --enable-libwavpack --enable-libwebp --enable-libx264 --enable-libx265 --enable-libxml2 --enable-libzimg --enable-lzma --enable-zlib --enable-gmp --enable-libvidstab --enable-libvorbis --enable-cuda --enable-cuvid --enable-d3d11va --enable-nvenc --enable-dxva2 --enable-avisynth --enable-libmfx

  libavutil      55. 78.100 / 55. 78.100

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  libswscale      4.  8.100 /  4.  8.100

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[matroska,webm @ 00000172cc898360] Could not find codec parameters for stream 5 (Subtitle: hdmv_pgs_subtitle (pgssub)): unspecified size

Consider increasing the value for the 'analyzeduration' and 'probesize' options

Input #0, matroska,webm, from 'file:S:\Media Storage\Movies\Deadpool\Deadpool (4K UHD).mkv':

  Metadata:

    title           : Deadpool

    encoder         : libmakemkv v1.10.9 (1.3.5/1.4.7) darwin(x64-release)

    creation_time   : 2018-01-09T02:58:57.000000Z

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    Metadata:

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      _STATISTICS_TAGS-eng: BPS DURATION NUMBER_OF_FRAMES NUMBER_OF_BYTES SOURCE_ID

    Stream #0:1(eng): Audio: truehd, 48000 Hz, 7.1, s32 (24 bit) (default)

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      _STATISTICS_WRITING_APP-eng: MakeMKV v1.10.9 darwin(x64-release)

      _STATISTICS_WRITING_DATE_UTC-eng: 2018-01-09 02:58:57

      _STATISTICS_TAGS-eng: BPS DURATION NUMBER_OF_FRAMES NUMBER_OF_BYTES SOURCE_ID

    Stream #0:2(eng): Audio: ac3, 48000 Hz, 5.1(side), fltp, 640 kb/s

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    Stream #0:3(eng): Audio: ac3, 48000 Hz, stereo, fltp, 224 kb/s

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      DURATION-eng    : 01:47:39.307020833

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      _STATISTICS_TAGS-eng: BPS DURATION NUMBER_OF_FRAMES NUMBER_OF_BYTES SOURCE_ID

Stream mapping:

  Stream #0:0 -> #0:0 (hevc (native) -> h264 (libx264))

  Stream #0:2 -> #0:1 (ac3 (native) -> ac3 (native))

Press [q] to stop, [?] for help

[libx264 @ 00000172ce14db00] using SAR=1/1

[libx264 @ 00000172ce14db00] frame MB size (240x135) > level limit (8192)

[libx264 @ 00000172ce14db00] DPB size (4 frames, 129600 mbs) > level limit (1 frames, 32768 mbs)

[libx264 @ 00000172ce14db00] VBV bitrate (102283) > level limit (50000)

[libx264 @ 00000172ce14db00] VBV buffer (204566) > level limit (62500)

[libx264 @ 00000172ce14db00] MB rate (776823) > level limit (245760)

[libx264 @ 00000172ce14db00] using cpu capabilities: MMX2 SSE2Fast SSSE3 SSE4.2

[libx264 @ 00000172ce14db00] profile Main, level 4.1

[libx264 @ 00000172ce14db00] 264 - core 152 r2851 ba24899 - H.264/MPEG-4 AVC codec - Copyleft 2003-2017 - http://www.videolan.org/x264.html - options: cabac=1 ref=1 deblock=1:0:0 analyse=0x1:0 me=dia subme=0 psy=1 psy_rd=1.00:0.00 mixed_ref=0 me_range=4 chroma_me=0 trellis=0 8x8dct=0 cqm=0 deadzone=21,11 fast_pskip=1 chroma_qp_offset=0 threads=18 lookahead_threads=3 sliced_threads=0 nr=0 decimate=1 interlaced=0 bluray_compat=0 constrained_intra=0 bframes=3 b_pyramid=2 b_adapt=1 b_bias=0 direct=1 weightb=1 open_gop=0 weightp=1 keyint=250 keyint_min=23 scenecut=40 intra_refresh=0 rc_lookahead=10 rc=crf mbtree=1 crf=18.0 qcomp=0.60 qpmin=0 qpmax=69 qpstep=4 vbv_maxrate=102283 vbv_bufsize=204566 crf_max=0.0 nal_hrd=none filler=0 ip_ratio=1.40 aq=1:1.00

[segment @ 00000172ce59d5a0] Opening 'S:\Mediabrowser\transcoding\transcoding-temp\0ea1665e3cdafef049ddc0594ebf69d10.ts' for writing

Output #0, segment, to 'S:\Mediabrowser\transcoding\transcoding-temp\0ea1665e3cdafef049ddc0594ebf69d1%d.ts':

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    encoder         : Lavf57.83.100

    Stream #0:0: Video: h264 (libx264), yuv420p, 3840x2160 [sAR 1:1 DAR 16:9], q=-1--1, 23.98 fps, 90k tbn, 23.98 tbc

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      cpb: bitrate max/min/avg: 102283000/0/0 buffer size: 204566000 vbv_delay: -1

    Stream #0:1: Audio: ac3, 48000 Hz, 5.1, fltp, 384 kb/s

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[segment @ 00000172ce59d5a0] Opening 'S:\Mediabrowser\transcoding\transcoding-temp\0ea1665e3cdafef049ddc0594ebf69d1.m3u8.tmp' for writing

[segment @ 00000172ce59d5a0] Opening 'S:\Mediabrowser\transcoding\transcoding-temp\0ea1665e3cdafef049ddc0594ebf69d11.ts' for writing

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[segment @ 00000172ce59d5a0] Opening 'S:\Mediabrowser\transcoding\transcoding-temp\0ea1665e3cdafef049ddc0594ebf69d1.m3u8.tmp' for writing

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[segment @ 00000172ce59d5a0] Opening 'S:\Mediabrowser\transcoding\transcoding-temp\0ea1665e3cdafef049ddc0594ebf69d1.m3u8.tmp' for writing

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[segment @ 00000172ce59d5a0] Opening 'S:\Mediabrowser\transcoding\transcoding-temp\0ea1665e3cdafef049ddc0594ebf69d1.m3u8.tmp' for writing

[segment @ 00000172ce59d5a0] Opening 'S:\Mediabrowser\transcoding\transcoding-temp\0ea1665e3cdafef049ddc0594ebf69d14.ts' for writing

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[libx264 @ 00000172ce14db00] mb B  I16..4:  4.1%  0.0%  0.0%  B16..8: 16.1%  0.0%  0.0%  direct: 5.5%  skip:74.4%  L0:40.6% L1:50.8% BI: 8.7%

[Guest asrequested]

Well, MKV isn't supported, and are you trying to use subtitles?

[matroska,webm @ 00000172cc898360] Could not find codec parameters for stream 5 (Subtitle: hdmv_pgs_subtitle (pgssub)): unspecified size

You said when you remuxed to MP4 (as you tested, earlier), then play it with the AC3 track, what happens?

[mbnwa 49]

I understand that MKV is not supported however Emby has 3 modes Direct Play (nothing done, plays direct from the NAS), Direct Stream (remux based on invalid container as in this case and what I am aiming for or invalid audio codec) and Transcode (CPU HOG)

 

Subtitle was not selected (none)

 

When I remux to M4V HDR works, AC3 works and it's Direct Play, in my MKV example everything that was selected is supported by the device however for some reason Emby feels it necessary to transcode the audio and video as well as the container, however only the container should need to be changed thus falling under direct streaming vs transcode. 

Edited January 9, 2018 by mbnwa

[Guest asrequested]

Luke would have to confirm this, but (and I for get the correct terminology) in some instances, when a change needs to made (remux etc), the streams aren't transferable through the server, and are then transcoded. In your case, the container isn't supported and probably is forcing a full transcode. As you see by your own remux, it will direct play (with the AC3 track, selected)

[mbnwa 49]

Funny your thread https://emby.media/community/index.php?/topic/48799-direct-play-vs-direct-streaming-vs-transcoding/ states basically what I am doing base on the selected audio / video being supported by the device in question

 

Under the Direct Stream section, maybe Luke will chime in and advise why a full transcode is being forced and not just a simple remux into the new container.

• The container isn't supported by the player (MKV, AVI, MP4 etc). In this case, the server will demux the file and remux it in a supported container, with no change to the audio or video.

[Luke 33002]

ffmpeg log?

[mbnwa 49]

ffmpeg-transcode-d9506f88-6ba6-4702-81b1-48a27c623bd2.txt was posted 5 posts up inline.

[mbnwa 49]

If you look at my 2nd post the remuxed file is still in main 10 and it plays with direct play and HDR as expected the only difference is the addition of the "codec tag" that is missing from the MKV.

 

In addition the Apple TV 4K link that was posted states it supports Main 10 https://www.apple.co...le-tv-4k/specs/

Edited January 9, 2018 by mbnwa

[Luke 33002]

the video codec tag is not hvc1 and that is the reason for the full transcode.

 

 

 

@@ebr can further elaborate

[mbnwa 49]

Luke, the M4V has the codec tag of HVC1 (as seen by my screen shots) and does not transcode the MKV does not have the codec tag and transcodes vs direct stream, both files has the codec listed as "HEVC" this can all be seen in my screenshots on the 2nd post.

[Luke 33002]

right, the video codec tag is not hvc1 and that is the reason for the full transcode.

 

@ebr can further elaborate

[mbnwa 49]

MakeMKV does not put codec tag's in the MKV container as far as I can tell, so if the MKV needs to have codec tag's added hvc1, ac-3, ect how can that be added to the MKV?

[Guest asrequested]

MakeMKV does not put codec tag's in the MKV container as far as I can tell, so if the MKV needs to have codec tag's added hvc1, ac-3, ect how can that be added to the MKV?

 

I'm thinking that you can't. Apple does stupid things. I have a feeling that apple tv requires that tag, and can only be applied in the containers that apple, supports. I'm curious to see what @@ebr says. This interests me.

[Luke 33002]

We figured that over time apple would improve hevc playback so if there have been any tvos updates recently that might affect it then we can re-evaluate to see if the condition is still needed.

 

but @@ebr can elaborate.

[Guest asrequested]

Apple are so far behind the curve

 

#yesterday's tech

[andyblac644 69]

another reason to use infuse pro 5 as the external player  .

Edited January 9, 2018 by andyblac644

[ebr 13835]

Yes, it is the absence of the codec tag that is the problem.

 

The issue here is we have to err on the conservative side of transcoding when we don't know that codec tag.  Because Apple actually only supports one flavor of HEVC.  So, if your video happened to be the other flavor, it simply would not play.

[mbnwa 49]

I have not found a way to be able to add the codec tag into the MKV MakeMKV does not do it, MKVToolNix does not add the proper tag via it's hex editor it does allow a codec name tag to be added but Emby does not see that as Codec tag or any tag at all for that matter. What suggestion do you have to be able to add the Codec tag to the MKV so transcoding is not required?

Edited January 9, 2018 by mbnwa

[Zodler 14]

Please help. I have the same problem. If I play an MKV HEVC HDR, the TV does not switch to HDR and the server is saying it is transcoding. If I play other MKV AVC it says Direct playing.

 

If I use Infuse or MrMC emby client, they play the file correctly with TV switching to HDR and Emby server saying Direct Playing.

 

I hope you can correct this in Emby Apple TV app.

 

In the meantime I tried to mux the MKV to MP4 with no success. The resulted file is unplayable even on PC. The program I use it uses MP4BOX, what should I use to mux MKV HDR to MP4?