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I have some questions about how Blu-ray Disc video differs from VOD available on various streaming services. What are the main differences between a Blu-ray video and a video from any of the streaming-services ones? What changes the most? Is it the amount of colours? Is contrast lower? How much less sharp are the streaming videos? Do the same differences apply whether it be 1080p HD content vs. Blu-ray or the 4K UHD Blu-rays and UHD streaming? Are there any differences in quality between various streaming services? Is the same film on, for example, Amazon Video in the same format and of the same quality as it is on Netflix? Are the codecs used by various streaming Web sites the same? For example, I see that Vimeo, YouTube, and iTunes Store use H.264. If both a Blu-ray Disc and a streaming service use H.264, why is streaming video of lower quality? I presume it’s because of the compression scheme. Are the compression schemes all the same on various VOD Web sites? So a single-layer Blu-ray Disc can contain up to 25 GB of data and the dual-layer one 50. If you were the download a 1080p streaming video, how much storage would it occupy? Is the problem with the difference in quality a problem of internet speeds or does it lie somewhere else? A Blu-ray Disc can have a bitrate of up to 40 Mbps. What are the bitrate of streaming services? What kind of speeds will you need for uninterrupted, smooth streaming of 4K UHD video? Or, more generally, how do you calculate the speed needed for a content with a particular resolotion, given that this will change a lot in the future? Will we eventually have even the true Blu-ray Disc audio experience in streaming, too? Will streaming services eventually replace Blu-ray Discs and what are some of the things that need to happen for that to occur? I forgot a lot of what I was going to ask, and one thread got lost when I accidentally shut down my browser, but I think I’ve managed to recover the gist of what I was going for.