Found this video fascinating. Few takeaways:
- General: Many 4K movies may actually be digital upscales of 2K digital intermediates
- Video quality: Most streaming services limit you to around 1/4 of the bitrate of Blu-Ray - you may only see 35% of the colors of the original movie, due to the compression used (Rec 709). 4K Blu-Ray will retain much more of this.
- Audio quality: Blu-ray audio can deliver several megabits per second (TrueHD often around 3–6 Mbps, DTS-HD Master Audio even higher), whereas streaming audio usually operates in the range of a few hundred kilobits per second. This means Blu-ray carries several times more audio data. More data results in fewer compression artifacts, finer detail, clearer high frequencies, and more accurate low-end reproduction.
- Accessibility: Major films are scattered across different streaming services and may disappear forever. Physical copies are yours forever.
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