Is this something new? I have an audio file that is supposed to be DD 7.1, but it shows as EAC3 5.1. If I choose the dropdown in (browsing via web browser on my PLEX server), it shows that it’s DD-7.1 ch in grey. I’ve attached a picture.
Server Version#: 4.62.1
Player Version#: Browsing via Firefox
DD+7.1 ch is the track description from within your file (track metadata). Plex has been displaying those for some time – though not yet on all clients.
[from the related feature suggestion]
Basically the grey part is just a string from the track metadata itself while the header (English (EAC3 5.1)) is the actual technical details (language + codec/profile). So from the looks of it you got an English language 5.1 EAC3 track that’s been labelled as “DD+7.1 ch”.
If you want to be super sure you can check out the file using MediaInfo (or check out the Get Info overview from within Plex).
https://support.plex.tv/articles/201998867-investigate-media-information-and-formats/
Interesting enough, the media info shows DD 7.1 as well.
The more critical part is that it shows 8 channels – the “DD+7.1 ch” part is just the title (custom string).
What is showing in the Get Info dialog inside Plex – preferably after triggering Analyze for that item?
Media
Duration 2:29:55
Bitrate 14334 kbps
Width 1920
Height 804
Aspect Ratio 2.35
Video Resolution 1080p
Container MKV
Video Frame Rate 24p
Video Profile high
Part
Duration 2:29:55
File Movie 2021 Director’s Cut 1080p BluRay DD+7.1 x264-LoRD.mkv
Size 15.01 GB
Container MKV
Has Thumbnail 1
Video Profile high
Codec H264
Bitrate 14142 kbps
Language English
Language Tag en
Bit Depth 8
Chroma Location left
Chroma Subsampling 4:2:0
Coded Height 816
Coded Width 1920
Color Primaries bt709
Color Range tv
Color Space bt709
Color Trc bt709
Frame Rate 23.97599983215332 fps
Height 804
Level 4.1
Profile high
Ref Frames 5
Scan Type progressive
Width 1920
Display Title 1080p (H.264)
Extended Display Title 1080p (H.264)
Codec EAC3
Channels 6
Bitrate 1024 kbps
Language English
Language Tag en
Audio Channel Layout 5.1(side)
Sampling Rate 48000 Hz
Title DD+7.1 ch
Display Title English (EAC3 5.1)
Extended Display Title DD+7.1 ch (English EAC3 5.1)
Codec AC3
Channels 2
Bitrate 192 kbps
Language English
Language Tag en
Audio Channel Layout stereo
Sampling Rate 48000 Hz
Title Commentary by Producer/co-Writer/Director JL.
Display Title English (AC3 Stereo)
Extended Display Title Commentary by Producer/co-Writer/Director JL. (English AC3 Stereo)
Codec SRT
Language English
Language Tag en
Display Title English (SRT)
Extended Display Title English (SRT)
Codec SRT
Language English
Language Tag en
Title SDH
Display Title English (SRT)
Extended Display Title SDH (English SRT)
Codec SRT
Language English
Language Tag en
Title Commentary
Display Title English (SRT)
Extended Display Title Commentary (English SRT)Seems to be related to how ffmpeg is detecting those tracks. Apparently there’s a special encoding of 7.1 formats to make them compatible w/ 5.1 layouts where ffmpeg will identify the track as 5.1 / 6 channel format.
There’s a longer thread about the technical details.
From doing a quick scan over the thread it seems ffmpeg has released a newer version that should handle such tracks better – no ETA as for when Plex will incorporate that version
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