For the best viewing experience with proper subtitles and supporting the creators, you can find Happening on official platforms:
The video compression codec used (H.264/MPEG-4 AVC), standard for high-quality HD video.
The film won the prestigious Golden Lion at the 2021 Venice Film Festival.
Available on Amazon Prime Video and other major VOD services.
The source of the video is an official Blu-ray disc, which generally offers higher bitrates and better visual quality than streaming rips (WEB-DL).