Decoder (codec arib_caption) not found for input stream #0:2

[Habanero]

Summary of the bug:
I have an MPEG-TS file ("test.ts" with "test.ass" sub file) that I wanted to test AV1 encoding on. This seems to be an obscure error regarding subtitles, since the only thing I could find on Google was another post suggesting that I downgrade to 4.1.4 (searching for arib_caption brings up more relevant results such as ​https://github.com/nkoriyama/aribb24/issues/10).
​https://2ch.pet/contents_anago_software_1499270202_all

This is the error log when I try the following command:
​https://pastebin.com/5hYsi8uU

Full console output for the file:
​https://pastebin.com/gbkgGeU4

Oddly enough, this doesn't occur on the sample file I outputted using the following:

ffmpeg -ss 00:08:00 -i test.ts -ss 00:01:00 -t 00:01:00 -c copy testclip.ts

Since the error doesn't seem to occur on the clipped sample, I haven't uploaded it. The original video file is 5GB. If you want, I can upload that.

How to reproduce:

ffmpeg -i test.ts -c:v libaom-av1 -crf 15 -b:v 0 -strict experimental av1_15test.mkv

ffmpeg -i test.ts -c:v libx265 -crf 15 -c:a aac -b:a 320k test.mkv

[Carl Eugen Hoyos]

Please post the command line you tested together with the complete, uncut console output here to make this a valid ticket.

[Habanero]

? Aren't those included in the original post?

Console output:
​https://pastebin.com/gbkgGeU4

Command line:
ffmpeg -i test.ts -c:v libaom-av1 -crf 15 -b:v 0 -strict experimental av1_15test.mkv

If this is not what you're asking for, then my mistake. I'm new to this.

[Carl Eugen Hoyos]

If you choose to provide the console output, please also provide a short sample (made with dd).