ffmpeg burn chinese subtitle(srt) with error

Question

I use ffmpeg to add Chinese subtitles to the video. and the libass library has been installed.

I execute the following command and error messages will appear

ffmpeg -i video.mp4 -vf "ass=subtitle.srt" -y out.mp4

error message:

And the Chinese subtitles of the output video are unreadable.

So the question I want to ask is：

1. What caused this?

2. how to fix?

Answer 1

Solved! Need to install fonts

Problem finding step:

a) find ffmpeg fontconfig

cat /opt/ffmpeg/lib/pkgconfig/fontconfig.pc

b) find fontconfig config file according to the path obtained above

cat /opt/ffmpeg/etc/fonts/fonts.conf

c) Put the required fonts into this folder /usr/share/fonts/truetype