Issue with burn subtitle

[chienhao10]

This tool is great and thx for this, I don't have to install all the stuff and run it on colab for srt generation. After i got text generated, I tried to Burn in to video. No matter use the Burn in "Transcript" or "Subtitle", I will get below attached result. It seems I am missing the font file? My text strings are in Chinese

Some text got generated and try to burn in: `1 00:00:00,720 --> 00:00:02,000 哈囉大家好我是品哥

2 00:00:02,000 --> 00:00:04,400 今天又來到了大家最喜歡的單元

3 00:00:04,400 --> 00:00:06,599 麥當勞新品開箱

4 00:00:06,599 --> 00:00:08,699 這次我要開箱的第一個是

5 00:00:08,699 --> 00:00:10,500 熬龍蝦堡`

Another question is what does "Add" do? I thought this will add generated string in to video, but I actually don't see anything been added. Only "Burn" will have different outcome.