How to find link to video file from URL

[Pavel_47]

There is a problem embed WebVTT(.vtt) in mp4

Embed WebVTT? No, not supported in MP4

So can use FFmpeg look at link or search.

I found this command searching on the web. I thought that it should work as follows:

1. download video stream, audio stream and subtitles as .vtt
   
2. merge video and audio
   
3. convert subtiles .vtt to subtitles .srt
   
4. embed .srt in video-audio
   

So the command syntax is wrong or yt-dlp just doesn't allow you to do this ?
According to your advise to build the video with subtitles, one have to proceed with 2 streps:

1. download and merge audio & video and download subtitles .vtt using yt-dlp
   
2. use FFmpeg to embed .vtt in video
   

Correct ?