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With the said technologies, Blu-rays can deliver spectacular audio effects. Blu-rays have been utilizing the Dolby TrueHD and DTS HD Master Audio standards for years. Also the sound quality of digital HD videos is not as good as Blu-rays. Those are the compromises you will have to make when using streaming services.
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A compressed video will inevitably have some artifacts like softness or banding that could have negative effects on the image quality. In comparison, a 1080P movie you download from iTunes is mostly around or under 6GB. A single-layer Blu-ray disc can hold 25GB of data and a dual-layer disc can hold 50GB. So the service provides will have to use compression to make the video smaller and easier to be delivered to viewers via the internet. The speed limit of the internet dictates the video files being transferred can't be too large. Movies provided by these streaming services might have the same resolution as Blu-ray, but in order to be able to make the delivery of the movie on the internet possible, there will be compressions on the movie. While resolution does reflect the video quality in a certain degree, there are a lot of other aspects about a video that could affect the quality of a video. Some might take resolution as the basic standard of quality. With years of development, many streaming service providers had started to offer 720P, 1080P or even 4K as well. Most Blu-rays are at 720P or 1080P resolutions with some exceptions of 4K discs.
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