It looks like you’ve provided a filename fragment from a video release of The Mentalist (likely a typo, as the show has 7 seasons, not 8). The string "The Mentalist S01-S08 720p 10bit WEB-DL 2CH x26..." suggests a pirated video file (WEB-DL, 10-bit, 2-channel audio, x264/x265 encoding).
: The full run of the show, from the Pilot to the series finale. 720p : High-definition video resolution (1280 x 720 pixels). The Mentalist S01-S08 720p 10bit WEB-DL 2CH x26...
The show balances a "case-of-the-week" format with an overarching mystery involving Jane's past. It looks like you’ve provided a filename fragment
Have you re-watched The Mentalist recently? Let us know in the comments if you preferred the Red John era or the later FBI seasons! as the show has 7 seasons