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The video quality is bad, the music changes every three seconds, and the user interface is clumsy. The reason for this can be found in its source material: an HDTV broadcast of a foreign film about American soldiers in Iraq. Unlike most other video formats, 720p or 1080p creates a lot of data that can't be re-used when compressing the file again. So when compressing this poor-quality 720p file for distribution to people with high-definition TVs, it's often compressed at lower resolutions in order to make the file fit on people's screens without losing too much quality. Reducing the resolution of files is known as "rescaling" in the industry. And the rescaling is performed during distribution, which has some downsides. The first one is that the new lower resolution video may not match your screen size. Your screen could be significantly smaller or larger than what's expected by the server. The second problem is that when you play back a file downloaded on your computer, it will be upscaled to fit on your screen. This means there will be a lot of data generated, and a lot of pixels generated from this data – which can cause a significant drop in quality. And for both of these problems, the only way to avoid it is to know exactly what is happening. Video-rescaling can be done before or after compression. There are techniques that allow for very good quality rescaling, but they're very CPU-intensive. This means that servers will often host videos in multiple resolutions at once – one resolution for small screens and one resolution for big screens – and then decide which resolution to send you depending on your screen size before starting the video. For example, a server could host a video at 720p and 1080p at the same time, and then decide which file format to send you depending on your screen size before starting the video. If you don't want to rescale videos at all, there's a way to get them not rescaled. It's called "pass-through" in the industry. This means that all resolutions will be stored together in a video file. When you play it back on your computer, there is no upscaling or downscaling done – just a direct copy from one resolution to another. This method could be used for both video and audio, making it perfect for distributing live broadcasts. However, it's difficult to do these days, because the servers that host video files don't allow the "pass-through" method. Most of the time, videos are rescaled to fit on your screen, not just one size. TV broadcasts are often done this way too – television networks promote their shows with high-definition content because people want to see their favorite TV shows in crystal clear quality. But there are still many people with old TV sets at home who don't want to lose quality by watching the show on their old crappy TV. cfa1e77820
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