FFmpeg添加视频内嵌字幕提示“Could not create a libass track when reading file”

错误提示

Could not create a libass track when reading file '1.ass'
Error initializing filter 'ass' with args '1.ass'

解决办法

检查字幕文件的字符编码并改为UTF-8

来源：https://ffmpeg.zeranoe.com/forum/viewtopic.php?t=859