Plex is transcoding 90% of my anime

Server Version#:
Player Version#:
<If providing server logs please do NOT turn on verbose logging, only debug logging should be enabled>

anyone know the reason? Every other thing i download never transcodes ( 4k blu ray remux movies, TV shows, Blu ray rips of tv shows… )

its just anime?

Server is a synology nas with quickync intel gpu.
client is nvidia shield 2015

when watching from my iphone it never needs to transcode.

at first i thought it was the styled subtitles that were the problem, but it is not. when i disable subtitles it still transcodes.

any idea? it are mostly blu ray rips with FLAC audio.

Stream Details    Source Details

Media
Bitrate 20992 kbps 5683 kbps
Resolution 1080p 1080p
Quality Original -
Container transcode
Container MKV MKV
Video transcode
Codec H264 (HW) H264
Bitrate 20736 kbps 5683 kbps
Width 1920 1920
Height 1080 1080
Framerate 24p 24p
Dynamic Range SDR SDR
Aspect Ratio - 1.78
Audio transcode
Codec OPUS FLAC
Bitrate 256 kbps
Channels 2 2
Language - Japanese
Subtitles burn
Codec ASS ASS
Language - English

Have you run a speed test from the Shield to check the network speeds?

Hi ,

That is not the issue , since 100 gb 4k blu ray remuxes all play fine.

It is also transcoding to a higher bitrate than the source. If it was a network issue it would transcode to a lower bitrate.

I also send the file to 3 other plex users and I really think it is an exoplayer issue but I want to know what part is not compatible.

Ah. I read the numbers backwards (transcoding 20 → 5).

Can you post the actual media XML info, instead of the Plex dashboard?

here you go. il post multiple files that can’t play :slight_smile:

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10bit H264 is known to have bad direct play support.

but almost all my movie blu ray rips are also 10bit? and they play flawless

or is 10bit h265 much better supported?

anyone know if the devs are working on that?

it works flawlessly in kodi with the pm4k plugin so its not that much of an issue. Just kinda silly that it’s only on that stupid exoplayer :confused:

edit nvm: those blu rays probably use HVEC.

Kodi is playing it in software decoding.
The only devices I know of that support Hi10P in hardware are the Fire Stick 4k/4k Max.

Yeah but as long as it is not transcoding. It plays flawless on kodi and in plex it’s a buffer fest every 2-3 min.

Possibly anything to do with subtitles? I see one line in your media info that says Subtitles burn. Burning subs is a transcode. Did you force all subtitles in your client settings to burn all, burn images only or burn if necessary?

The issue is already identified. The OP is playing back 10-bit H264 content on a device that does not support that video type. They can get it to direct play by using an alternate client that has a software decoder for that format. Plex does not utilize software decoders for video formats, so they will not be able to use the official Plex client unless they change to a different streaming device.

The OP claimed that other 10-bit media plays fine, no transcoding. The post implied that the working media is 10-bit x265, which I would expect would have less support for direct play than 10-bit x264, the OPs original problematic file.

I have a Synology with Plex on it. It has horrendous performance when transcoding a file with subtitles, as it seems to use single-core software encoding for the subtitle track burning. This results in not only a transcode, but one that is slower than real-time, resulting in buffering. Without the subtitle, a video can be transcoded in real-time without the OP possibly even noticing this happening.

Which is why I asked if this anime uses subtitles, and whether they have set in the client to always burn subs. If it can be avoided by turning off always-burn, then that fixes it. If it burns because the client cannot support the .ass subtitle, then nothing can be done.

You are mistaken. 10-bit h265 (HEVC) is widely supported in devices because it is what is used by commercial streaming services for 4K/HDR content. 10-bit h264 was never a codec used in commercial streaming. Its usage in the anime community is due to benefits seen in encoding that specific content type to reduce banding.

Since anime encodes are targeted for PC usage they didn’t have concerns over hardware playback device support. It was just PC software you could easily upgrade.

Interesting. I hadn’t seen anything 10-bit encoded except for anime, and it was always x265. Nowadays, I see 10-bit 265 for other content as well.

I had avoided 265 because of the lack of support in some players, and the audio delay on resuming playback, which I have since discovered that it appears to be the OPUS audio codec used, not the video track.

Hi10P (10-bit h264) was the dominant codec used in anime encoding for a good decade or so. I think a lot of its “market share” fall is due to how the media is obtained. Folks are no longer having to capture Japanese digital TV broadcasts as a source (necessitating re-encoding for the final release). Nowadays the most popular releases are not true fansubbers, they are fanrippers that are just downloading and repackaging content from the commercial streaming services like Crunchyroll (so the video is 8-bit h264 from the beginning and left as-is).

It wasn’t until the last few years or so that anime encoders have really started to feel that h265 was “there” as a codec, quality-wise. So the usage is climbing now, but many BD releases out there are still Hi10P today.

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