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HEVC compression format requires half the bandwidth to run a channel in same quality as compared to what will needed using MPEG4 technology. So if a HD channel requires 5 to 8 Mbps bandwidth (depending on resolution of channel and quality maintained by operators) using MPEG 4 , same can b achieved within 2.5 to 4 Mbps bandwidth if HEVC technology is used.
Now a 4K channel requires twice the bandwidth of a HD channel hence as all hybrid/smart boxes of various DTH r HEVC enabled hence they can provide a 4K channel in equal bandwidth as is required for running a HD channel in MPEG4 on their platform
Forget About 4K, If Bandwidth Is Not An Issue For DTHs,
Why So Many HD Channels Pending To Be Added Across All DTHs?