Does the Media Player App support H.264 MKV video files for now?

The same is true with MKV files encoded with h.264 and AC3 audio. Nothing will play in the Media Player app from my DLNA server. It was working an hour ago, but not anymore.

Maybe someone could at least confirm for me whether this is even a use-case that is expected to work?Is it expected that you can stream MKV video using the Media Player app on Xbox One from a Win8.1 PC media library?

I have subsequently tried to re-pro the issue on a fresh build of Win8.1 on a different PC on my home network, using the same MKV files, and same Media Streaming options. In this case Media Player app on XB1 does not even list the MKV files within this media
library. Maybe this is the default behaviour instead?

On the PC hosting the MKV files with which the Media Player app gives error 0xc00d36c4, I once had some third-party MKV codecs installed (CCCP) so that I could watch MKVs in Media Player 12 for Windows 8. Once MS added MKV support to the Video app in Win8.1
I uninstalled these third-party codecs. Could this be the only reason that the Media Player app on XB1 sees the MKV files in this media library, and it isn't even supposed to?

From USB storage device to Xbox 360 Dashboard Video Player: WMV(Unprotected), Mpeg4, H.264, AVI

From Windows Media Player 11 to Xbox 360 Dashboard Video Player: WMV(Protected), WMV(Unprotected), Mpeg4, H.264, AVI

From the Zune software to the Xbox 360 Dashboard Video Player: WMV(Unprotected), Mpeg4, H.264

From Windows Home Server to the Xbox 360 Dashboard Video Player: WMV(Protected), WMV(Unprotected), AVI

From Windows Media Center to an Xbox Media Center Extender: WMV(Protected), WMV(Unprotected), MPEG-2

If you video files are not compatible with you Xbox, you may need to convert using conversion utility like
Handbrake,
AppGeeker, etc., both of them have presets

to make things easier.

....

1. What does the error code mean?
2. Why does this affect both MP3 and MKV files?

1. My assumption is, that either the console doesn't have the fitting codecs for the media file, or after searching for this particular error, that the Media Player app has issues with drives larger than 2TB.

In order to resolve the codec question, it would help if you knew the audio and video codec used on the MKV or MP4 file (or did you mean MP3 audio-only file in your first original post)?

2. It depends on wether your original post or this post has a typo.

If your first post is correct, and you have issues with MP4 (four) and MKV, then know that both filetypes are container files for a video and audio stream of varying codec formats.

For example, you could have a MKV consisting of a MPEG2 Video stream and Ogg Vorbis audio compression. Or the MP4 could be a H.264 Video stream and a AAC encoded audio track.

The Xbox One only has limited support for various audio and video codec combinations.

If your second post is correct, and you have issues with MP3 (three) audio files (that should work 100%), then I'd assume the issue is, that the console's Film & TV app can't work with drives larger than 2TB, as people with similar issues report that 2TB
hard drives with MBA work, whereas GPT partitioned discs seem to cause this error with disks beyond the 2TB limit.

Hiya, bit long winded, but hope this helps!:

Supported File Types

The Xbox 360 supports AVI, WMV, MPEG-4 Part 2, H.264 and QuickTime movie formats. The file extensions included are as follows: .avi, .divx, .wmv, .mp4, .m4v, .mp4v, and .mov.

Video Playback

For video files with the WMV container, playback occurs at 15 Mbps (Mega-Bytes Per Second) with a resolution of 1920 x 1080. Files with the H.264 container have the same resolution, but are played back at 10 Mbps. For AVI and MPEG-4 Part 2 video files, playback
is 5 Mbps at 1280 x 720 resolution.

Audio Playback

The Xbox 360 supports WMA 7-9 and Lossless audio profiles for WMV video formats. Dolby Digital and MP3 profiles are supported in AVI formats. For MPEG-4 Part 2 and H.264 encoded videos, the console supports only two-channel AAC audio encoding.

Streaming Video

With Zune software, the Xbox 360 can stream unprotected AVI, MPEG-4 Part 2, H.264, and WMV video formats. Through Windows Media Player, protected and unprotected WMV videos can be streamed.

Streaming Tips

Download a third-party video codec package to expand the amount of video formats you can stream using the Windows Media Player. For better playback, convert video files into the more Mircosoft user-friendly WMV format using a third-party video conversion
program.

Source(s):

Video Playback & Audio Streaming FAQ for the Xbox 360