How to make screenshots from TS video stream?

I would like to make screenshots each 1 minutes from the video stream. The video stream is provided as m3u8 file:

#EXTM3U
#EXT-X-TARGETDURATION:6
#EXT-X-VERSION:3
#EXT-X-MEDIA-SEQUENCE:112076
#EXT-X-PROGRAM-DATE-TIME:2019-03-19T16:16:53Z
#EXTINF:6.000, 2019/03/19/16/16/53-06000.ts
#EXTINF:6.000, 2019/03/19/16/16/59-06000.ts
#EXTINF:6.000, 2019/03/19/16/17/05-06000.ts
#EXTINF:6.000, 2019/03/19/16/17/11-06000.ts

I found a library to parse it - https://github.com/globocom/m3u8. But I don't understand how I can convert this TS video stream to single jpeg file. Am I supposed to

1. download TS file
2. find needed frame
3. extract it
4. delete ts file?

Should I use OpenCV or is there any easier solution?

use OpenV

from How to make screenshots from TS video stream?