Build in subtitles stopped working after upgrading to 4.8.11.0

[ziga.zajc007 0]

Yesterday I was watching the same episode with subtitles normally using Chrome on MacOS. Today when I have upgraded Emby Server to 4.8.11.0 any build in subtitles in the same video stopped showing.

Downloaded subtitles with Emby works / gets shown. But build in ones does not.

mediainfo for those subtitles

Text #1

ID                                       : 3

Format                                   : ASS
Muxing mode                              : zlib
Codec ID                                 : S_TEXT/ASS
Codec ID/Info                            : Advanced Sub Station Alpha
Duration                                 : 23 min 45 s
Bit rate                                 : 116 b/s
Frame rate                               : 0.220 FPS
Count of elements                        : 314
Compression mode                         : Lossless
Stream size                              : 20.2 KiB (0%)
Title                                    : English
Language                                 : English
Default                                  : Yes
Forced                                   : No

 

[Luke 42077]

 

Hi there, let's look at an example. Please attach the information requested in how to report a media playback issue. Thanks!

 

[ziga.zajc007 0]

Tried watching and changing subtitles again between 07:30 and 07:31. I don't see any errors 

embyserver.txt

[Luke 42077]

How does safari compare?

[ziga.zajc007 0]

The same issue is present on all videos with build in ASS subtitles.

[ziga.zajc007 0]

On Emby Android application ASS subtitles on HEVC work. Except on AV1 encodes which is a separated bug already reported.

[ziga.zajc007 0]

On Safari they work but most likely because of transcoding for both HEVC and AV1

Edited March 11, 2025 by ziga.zajc007

[ziga.zajc007 0]

Subtitles work on Emby Desktop application for Mac OS (2.2.36). But playing AV1 videos is really laggy on it, while on Chrome (same device) it is really smooth. This device does not have hardware AV1 decoder, but videos are encoded using "--fast-decode 1 --tile-columns 1" parameters which makes decoding a lot faster even on old devices without hardware AV1 decoder. I believe that I have already reported AV1 slow decoding problem in Emby Desktop application for Mac OS in another bug report. 

[Luke 42077]

I tested Chrome on macOS and it seemed to be working just fine in my testing. Ass subtitles were displayed. Can you provide a copy of the video for testing? Do you have any browser extensions installed?