The gold standard is to deliver an uncompressed signal over SDI. Then it goes directly to the TV provider’s encoder, which distributes it further through its own network. However, taking the signal in SDI is only possible with Dutch channels, and in practice the H264 or H265 signal is taken at a fixed bit rate. Your TV provider can convert this into a variable bit rate signal.
The DVB standard is defined by ETSI, which in turn explains the MPEG standards. The most relevant standard is TS 101 154, which regulates the resolution combinations and other parameters used and specifies what television providers are allowed to broadcast and what televisions must support. For example, TS 101 154 states that HDTV is 1080i maximum and all require multiple UHD devices, or that if H.265 is used, 50p must always be used and SD broadcasts are prohibited in H.265.
The huge mess that exists with smart TVs, in which you can’t use your apps after a few years, doesn’t exist with broadcast TV, thanks to this standard: TV providers across Europe adhere to TS 101 154, so that if you buy a TV in the store you buy it, it’s Compatible with your TV provider’s signal.
It makes no sense for ETSI to introduce AV1 in TV standards: UHD TV standards are already established, H.265 is mandatory. Every 4K TV sold supports H.265 and if TV providers want to offer 4K they will have to use H.265. Adding AV1 only causes the consumer to suffer and therefore adds nothing.
However, you can expect H.266 154 to be allowed in a future version of TS 101. At the moment, this is not allowed yet, and the improvements are often interrelated. Just as 4K, H.265, 50p, HDR, and BT.2020 will be tied together, so will H.266 and other enhancements that will all need to be supported together.
[Reactie gewijzigd door dmantione op 30 december 2022 21:25]
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