Comcast spike tv channel 720p#
When it comes to H265/HEVC, AIUI 1080i is encoded without any awareness of interlacing (unlike H264 which can use PAFF and MBAFF to increase compression efficiency) and treats the 1080i fields as consecutive 540p frames (so exploits no inter-field compression) and this means 1080i encodes even less efficiently than 720p in H265 than in H264. The real reason is, no doubt, that 720p compresses to a lower bitrate. So in reality their argument is close to nullified. (So the argument about a single encode is moot at that point.)
That said - any IP delivery aimed at consumer devices over the public internet and/or WiFi in the final link should, these days, be using MPEG-DASH style streaming that allows seamless bitrate switching, which allows for seamless resolution switching too. Presumably Comcast can cross-convert 1080i to 720p and then make the streams available to IP-type devices as well as conventional TVs/set-top boxes. One area where the move from i to p makes sense is if you use the same streams for delivery to both set-top boxes and tablets/AppleTV/Roku type devices (which typically have poor or no deinterlacing internally and don't offer a passthrough option) Many leading HD channels already deliver video in 720p60, and the progressive format renders motion more effectively.īased on extensive testing and research, we’re confident the combination of MPEG-4 encoding and the progressive format will allow us to deliver superior video performance to our customers. Most video delivery is moving toward progressive formats. The interlaced format reduces the effective resolution of 1080i significantly. In addition, the transition to progressive format allows us to offer a uniform HD experience across all devices, apps and screens, ensuring a consistently excellent experience. The progressive format offers a number of advantages, and is an important component of the transition to IP video delivery. This means that some channels that were delivered in 1080i will now be delivered in 720p60. We are making this change in conjunction with the transition to MPEG-4. As part of our ongoing work to improve and modernize the way we deliver HD channels, we are transitioning all of our HD streams to “progressive” format. In regards to 720p delivery, some of your HD channels have transitioned from 1080i to 720p60. I was out of the office last week on vaction and just returned today. 1080i channels are being changed to 720p60 channelsĪpologies for the delay in responding.
0 kommentar(er)
