Android vs Android TV Subtitle Support

[RedPhosphorus]

I've noticed that whenever I watch content on my TV using the Android TV app, I'll transcode due to not supporting the .ass subtitles. (Not exactly a huge issue, but I spend some time trying to figure out if it could use extracted subtitles instead of transcoding.) During that process, I played my test file on my phone and realized that it doesn't transcode the video at all. (It does remux from .mkv to .mp4 though.)

So I guess I have two questions here:

1. Is it possible for the Android TV app display the subtitles without transcoding?
   
2. Is there a way use extracted subtitles instead of transcoding the video?
   

Android

Code:

[2025-01-05 21:54:56.455 -06:00] [INF] [41] MediaBrowser.MediaEncoding.Transcoding.TranscodeManager: "/usr/lib/jellyfin-ffmpeg/ffmpeg" "-analyzeduration 200M -probesize 1G -fflags +genpts -f matroska  -i file:\"/media/Anime/Ameku M.D. Doctor Detective (2025) [tvdbid-448477]/Season 01/Ameku M.D. Doctor Detective (2025) - S01E01 - 001 - Dr. Sherlock.mkv\" -map_metadata -1 -map_chapters -1 -threads 0 -map 0:0 -map 0:1 -map -0:s -codec:v:0 copy -bsf:v h264_mp4toannexb -start_at_zero -codec:a:0 copy -copyts -avoid_negative_ts disabled -max_muxing_queue_size 2048 -f hls -max_delay 5000000 -hls_time 6 -hls_segment_type fmp4 -hls_fmp4_init_filename \"e0bd4f6403a159f8b4cc33e977251e55-1.mp4\" -start_number 0 -hls_segment_filename \"/cache/transcodes/e0bd4f6403a159f8b4cc33e977251e55%d.mp4\" -hls_playlist_type vod -hls_list_size 0 -y \"/cache/transcodes/e0bd4f6403a159f8b4cc33e977251e55.m3u8\""

Android TV

Code:

[2025-01-05 21:56:13.143 -06:00] [INF] [44] MediaBrowser.MediaEncoding.Transcoding.TranscodeManager: "/usr/lib/jellyfin-ffmpeg/ffmpeg" "-analyzeduration 200M -probesize 1G -f matroska -init_hw_device vaapi=va:,vendor_id=0x8086,driver=iHD -init_hw_device qsv=qs@va -filter_hw_device qs -hwaccel vaapi -hwaccel_output_format vaapi -noautorotate -i file:\"/media/Anime/Ameku M.D. Doctor Detective (2025) [tvdbid-448477]/Season 01/Ameku M.D. Doctor Detective (2025) - S01E01 - 001 - Dr. Sherlock.mkv\" -noautoscale -map_metadata -1 -map_chapters -1 -threads 0 -map 0:0 -map 0:1 -map -0:0 -codec:v:0 hevc_qsv -tag:v:0 hvc1 -preset veryfast -b:v 8118634 -maxrate 8118634 -bufsize 16237268 -profile:v:0 main -g:v:0 72 -keyint_min:v:0 72 -filter_complex \"alphasrc=s=1920x1080:r=23.976025:start='0',format=bgra,subtitles=f='/config/data/subtitles/8/8ca85328-f8ca-772d-463a-b25dda058dfe.ass':alpha=1:sub2video=1:fontsdir='/cache/attachments/5afcbc43648ddea483e5234f0d60a5a3',hwupload=derive_device=qsv:extra_hw_frames=64[sub];[0:0]setparams=color_primaries=bt709:color_trc=bt709:colorspace=bt709,scale_vaapi=format=nv12:extra_hw_frames=24,hwmap=derive_device=qsv,format=qsv[main];[main][sub]overlay_qsv=eof_action=pass:repeatlast=0:w=1920:h=1080\" -start_at_zero -codec:a:0 copy -copyts -avoid_negative_ts disabled -max_muxing_queue_size 2048 -f hls -max_delay 5000000 -hls_time 3 -hls_segment_type mpegts -start_number 0 -hls_segment_filename \"/cache/transcodes/a742ffc3a01040e981bba1ead13170cd%d.ts\" -hls_playlist_type vod -hls_list_size 0 -y \"/cache/transcodes/a742ffc3a01040e981bba1ead13170cd.m3u8\""

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Almost forgot; Server is running 10.10.3, Android TV is 0.18.3, Android is 2.6.2