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uk.tech.digital-tv (Digital TV - General) (uk.tech.digital-tv) Discussion of all matters technical in origin related to the reception of digital television transmissions, be they via satellite, terrestrial or cable. Advertising is forbidden, with no exceptions. |
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According to A516digital, the update today was:
"Channel 788 - ITV3 (PSB2/D3&4) Duplicate of service on channel 10, but with increased resolution." Sorry for the ignorance, but what does this mean? Is it likely that other stations will follow? -- Jeff |
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On Wednesday, 28 February 2018 20:32:40 UTC, Jeff Layman wrote:
According to A516digital, the update today was: "Channel 788 - ITV3 (PSB2/D3&4) Duplicate of service on channel 10, but with increased resolution." Sorry for the ignorance, but what does this mean? Is it likely that other stations will follow? -- Jeff Probably a higher bit rate, not HD rather than SD, but will check tomorrow. |
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R. Mark Clayton wrote:
Jeff Layman wrote: According to A516digital, the update today was: "Channel 788 - ITV3 (PSB2/D3&4) Duplicate of service on channel 10, but with increased resolution." Sorry for the ignorance, but what does this mean? Probably a higher bit rate, not HD rather than SD 720x576 instead of 544x576 |
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"Jeff Layman" wrote in message
news ![]() According to A516digital, the update today was: "Channel 788 - ITV3 (PSB2/D3&4) Duplicate of service on channel 10, but with increased resolution." Sorry for the ignorance, but what does this mean? Is it likely that other stations will follow? ITV3 (like Drama, Yesterday, Talking Pictures TV etc) is one of those channels that broadcasts in sub-SD: 544x576 rather than 720x576 (ie 3/4 of the normal horizontal resolution, rounded to the nearest 16-pixel boundary). So maybe 788 is 720x576. Yes, I've just run TSReader (Windows program) via my DVB-T decoder on mux PSB2 and sure enough, 788 (ITV3) is 720x576. Looks as if LCN 10 is still on mux COM4. I presume at some stage it will be switched off and the one on PSB2 will become LCN 10. |
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"NY" wrote in message
o.uk... "Jeff Layman" wrote in message news ![]() According to A516digital, the update today was: "Channel 788 - ITV3 (PSB2/D3&4) Duplicate of service on channel 10, but with increased resolution." Sorry for the ignorance, but what does this mean? Is it likely that other stations will follow? ITV3 (like Drama, Yesterday, Talking Pictures TV etc) is one of those channels that broadcasts in sub-SD: 544x576 rather than 720x576 (ie 3/4 of the normal horizontal resolution, rounded to the nearest 16-pixel boundary). So maybe 788 is 720x576. Yes, I've just run TSReader (Windows program) via my DVB-T decoder on mux PSB2 and sure enough, 788 (ITV3) is 720x576. Looks as if LCN 10 is still on mux COM4. I presume at some stage it will be switched off and the one on PSB2 will become LCN 10. On further analysis, the differences a - 720x576 as opposed to 544x576 video - Programme sound is 192 kbps rather than 128 kbps - 720 version has a second audio description sound channel which the 544 version doesn't - Video bit rate 2.03 Mbps as opposed to 1.72 Mbps - File sizes (for identical 23m 17s clips) 393 MB as opposed to 319 MB Theoretically, the 720 version should be 4/3 the file size of the 544 version because of the greater horizontal resolution, *assuming the same amount of compression*. In fact the 720 version is only 1.23 instead of the theoretical 1.33 times the size of the 544, so it looks as if the 720 is compressed a bit more. Here are identical stills, all scaled to a theoretical 16:9 display size of 1024x576: https://s10.postimg.org/sw5x8i67d/ITV3_544_-_1.png https://s10.postimg.org/w30gs562x/ITV3_544_-_2.png https://s10.postimg.org/z9v0bry8p/ITV3_720_-_1.png https://s10.postimg.org/aglgb3zsp/ITV3_720_-_2.png |
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On 28/02/2018 21:46, Andy Burns wrote:
R. Mark Clayton wrote: Jeff Layman wrote: According to A516digital, the update today was: "Channel 788 - ITV3 (PSB2/D3&4) Duplicate of service on channel 10, but with increased resolution." Sorry for the ignorance, but what does this mean? Probably a higher bit rate, not HD rather than SD 720x576 instead of 544x576 And now on PSB2 (so available to all) rather than the version on COM 4 (only available to 90% of punters) -- Mark Please replace invalid and invalid with gmx and net to reply. |
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"Mark Carver" wrote in message
... On 28/02/2018 21:46, Andy Burns wrote: R. Mark Clayton wrote: Jeff Layman wrote: According to A516digital, the update today was: "Channel 788 - ITV3 (PSB2/D3&4) Duplicate of service on channel 10, but with increased resolution." Sorry for the ignorance, but what does this mean? Probably a higher bit rate, not HD rather than SD 720x576 instead of 544x576 And now on PSB2 (so available to all) rather than the version on COM 4 (only available to 90% of punters) Good point. I'd forgotten that COM 4,5,6 are only on main transmitters and a few key relays, whereas PSB 1,2,3 are on all transmitters, even the Freeview Lite ones. I'm lucky that I'm on Bilsdale so I get everything, including COM 7 and 8. |
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