Subtitles without spaces do not break to a new line when overfull

[svenper]

mpv version and platform

mpv 0.30.0 Copyright © 2000-2019 mpv/MPlayer/mplayer2 projects
 built on Mon Nov 11 15:23:10 UTC 2019
ffmpeg library versions:
   libavutil       56.31.100
   libavcodec      58.54.100
   libavformat     58.29.100
   libswscale      5.5.100
   libavfilter     7.57.100
   libswresample   3.5.100
ffmpeg version: 4.2.1

Void Linux
linux 5.3.11
musl 1.1.24

Reproduction steps

• have a screen resolution of 2560x1600 with a DPI of 227
• mpv https://www.viki.com/videos/1143425v-the-legend-of-hao-lan-episode-17 --sub-font-size=85 --sub-font="Source Han Sans" --slang=zh --log-file=/tmp/mpv.log
• at 10:04, note the subtitle "一定不愿意看到你带着如此刻薄的仇恨去生活" / "she would definitely not want to see you live your life with such deep-rooted hostility"

Expected behavior

Subtitle lines without spaces (Chinese, Japanese, etc.) wrap automatically when too long.

Actual behavior

Such lines extend outside the window, with characters cropped.

Log file

mpv.log

Sample files

[Akemi]

report it to libass. i downloaded the vtt subs and converted them to ass with ffmpeg.

ffmpeg -i 17-1143425v.zh.vtt sub.ass

the result. .txt extension instead of .ass because github only allows text files with txt extension. add those subs to the libass issue.
sub.txt

[Akemi]

closing since it was reported upstream.

[escape0707]

This seems solved by both libass and the shown PR. But I think I'm facing this issue again with some long Japanese subtitles I generated from OpenAI/Whisper. Could it be that I'm using gpu-next? Maybe I should submit a separate issue report?

[llyyr]

Could it be that I'm using gpu-next?

I don't see why this would affect anything, but you could simply switch to vo=gpu to confirm...

[escape0707]

I just gave it a try with vo=gpu and yes, the subtitles are still not getting separated into multiple lines... I'm using mpv-git on Arch Linux, so I guess the fixes should have been included. And the undesired behavior also appears for me with mpv-android.

[llyyr]

Open a new issue with samples and follow the template