You're getting an SD channel resolution of 576p from most of the satellite channels because that's the most default resolution which is provided by the playout software these channels are using. In youtube, 1080p, 720p and 480p are the default resolution, while in playout software these are 570p, 420p etc. And this resolution helps the channels for an easy uplinking and downlinking from the satellite and hassle-free playback of show from the channel software.
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