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About davmel

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  1. The ABC are probably so desperate to save money that by moving to MPEG audio they don't have to pay royalties to Dolby or their license fee. Given that it's a MPEG-4 HD channel the audio should have been AAC rather than MPEG-1 because backwards compatibility isn't needed. Oh, and Alanh, for bitrates of 128kbps and higher (whether stereo or surround sound 5.1+ channels) LC-AAC should be used. HE-AAC is preferred only for <128kbps streams.
  2. Norway is the first country to switch off FM radio broadcasts completely in 2017 in favour of DAB: https://www.newscientist.com/article/2117569-norway-is-first-country-to-turn-off-fm-radio-and-go-digital-only/
  3. You can watch all the Tennis in full HD online for free. No need to waste your time with Prime if they refuse to get their act together.
  4. I can't blame you for having trouble in finding information. The online forums are full of clueless posters claiming that audio transmissions are using PCM etc because they are looking at the already decoded stats on their TV's rather than analysing the transmission parameters. No broadcaster on the planet would waste precious bandwidth transmitting audio in uncompressed PCM (as that would be 48kHz x 16bit = 768kbps just for stereo audio!). Digging deeper they appear to still be using dual stream audio on many terrestrial HD channels with AC3 DD5.1 in addition to MPEG-1 layer 2 (like some of our Australian broadcasters did many years ago). But the UK also transmits their channels on Freeview SAT and they appear to have identical (mostly dual AC3/MPEG) audio streams as on terrestrial, see transponder 10847 V: http://www.lyngsat.com/packages/Sky-UK.html I believe due to incompatibility with some Freeview STB's the UK couldn't fully support AAC audio on the Freeview platform (at least not until those devices are no longer supported). So they have to stick with AC3/MPEG1 for the time being.
  5. The fireworks in Sydney were very good quality. I noticed ABC HD was averaging just above 6 Mbps and with peaks around 6.8 Mbps during the fireworks which is double what ABC HD normally averages. I actually enjoyed the music performances from the Falls festival shown earlier in the night which looked amazing in HD. As for Melbourne fireworks on Seven, well not surprisingly both the fireworks themselves and the broadcast were a dud like they are every year compared with Sydney. Total waste of time unless you want something to scare the pets. Trying to broadcast them in HD wouldn't be worth the effort. Plus Melbourne studio shots and some ENG are still upscaled SD. It's nice of the ABC to repeat the entire broadcast from last night in full this afternoon.
  6. I agree, the Nigella show was noticeably better picture quality, but it still lacked critical detail that made it look like native HD. It still looked upscaled, however the appalling low bitrate can make it hard to tell. Even with a low bitrate (measured on my recording of Nigella as 2.768 Mbps) the very still static scenes should look good but the detail in those scenes is still missing so as far as I can tell it's still just upscaled SD.
  7. Foxtel doesn't want to upgrade all the older SD STB's all at once. They are waiting until natural attrition removes the remaining stock out in the field. Only when the last box is switched off will anything be done to change to HD. But as long as they are milking customers for a BS "HD" fee there is no incentive to change. SD will be around for a long time yet. Heck, they can't even be bothered to stream any channels online in HD. Foxtel are just a pathetic joke. They had good potential many years ago when they started HD but took the cheap way out and compressed more channels onto their transponders, then they pissed off many including myself by locking out 3rd party decoders. They never got another cent from me after that and never will. Financially supporting Foxtel by subscribing to them is just encouraging them to deliver substandard TV.
  8. Alan, where have you been for the past 10 years? ABC & SBS terrestrial multiplexes have been relayed throughout all of Australia in identical form via dedicated transponders for each state on Optus D1 for the past 10 years. There is no need for demuxing and remuxing etc as you claim because the entire terrestrial multiplex is transmodulated from the respective sat transponder for that state (and that now includes the ABC HD channel). Terrestrial re-transmissions of ABC and SBS have nothing to do with VAST. Only selected commercial network channels are demodulated from VAST and converted to MPEG-2 for broadcast locally in remote towns. The ABC/SBS channels on VAST are only there for viewing by direct VAST customers on VAST approved devices, not for relaying to terrestrial transmission sites (which is done via Optus D1). The ABC/SBS transponders on Optus D1 aren't even encrypted so it's relatively cheap and easy to transmodulate them to terrestrial without the expense and complexity of authorised smartcards, CAMs etc.
  9. Earlier this week they decided to massively increase the bitrate of SBS HD at the expense of the other SD channels (some of which had high bitrates of 5-6 Mbps. Up until this week SBS HD had an average bitrate of ~3 Mbps which was bloody awful and caused all the rapid scene change blocking problems. Increasing the bitrate back up to the levels it was at several years ago (currently averaging 9.2 Mbps).has improved the situation substantially. The resolution also increased from 1440x1080i to 1920x1080i. I imagine the "me too" timing of the SBS HD quality change was done deliberately at the same time ABC HD launched as a rather sad attempt to not look like SBS had the worst HD channel of all the broadcasters once ABC HD started. Frankly, it's rather pathetic that FTA broadcasters only get off their ass and improve picture quality when a competitor does something that would make them look bad. They don't give a sh*t what viewers want to see and the quality of the experience for viewers. It's all driven by ego and which network can get away with delivering the absolute minimum to keep the boss happy and money rolling in.
  10. The only changes noticed today are: 1. Recording the HD ABC channel now uses up noticeably less recorded space than recording SD ABC before. 2. The weather graphics etc on ABC News 24 have obvious interlacing artefacts with general coarse edges.
  11. As long as the fireworks are set off one at a time then it should look ok. If two or more fireworks are shown on TV at the same time then it will overload the encoder and the picture will look terrible ;-)
  12. Average bitrates ABC multiplex last week: ABC: 4.76 Mbps ABC2: 3.87 Mbps ABC ME: 3.53 Mbps ABC News 24 (HD): 7.34 Mbps Average bitrates ABC multiplex today: ABC: 4.04 Mbps ABC2: 3.72 Mbps ABC ME: 3,42 Mbps ABC News 24 (SD): 4.04 Mbps ABC HD: 3.17 Mbps Pretty easy to see how they just split the old ABC News 24 allocated bitrate and divided it up between the old and new channel.
  13. From memory ABC made significant changes to their multiplex in the past during the early hours of the morning, but lately given budget cuts I don't think they can afford the overtime so they may just end up doing the changes during the day when most full time staff are around to implement the changes.
  14. Any news on what time on Dec 6 the changes will take place? Will it be in the early hours or some time during the day?
  15. Either Telstra or NBNCo are providers of last resort. Under 100 premises per development NBNCo is the providers of last resort if the area is already RFS or publicly listed rollout area. NBNCo only does FTTP for greenfields areas. Only if the development is under 100 premises and not in an upcoming rollout area for NBN will Telstra be forced to deploy copper but the conduits and pits must still be designed for future fibre installation. I never said the noise margin on all lines is zero. That is just how you calculate the maximum attainable rate. A line at 0dB noise margin is on the threshold of instability where any extra noise impulses will result in transmission errors. Hence why minimum nominal noise ratio is set at 6dB both for ADSL and VDSL. This means if the maximum attainable rate (at 0dB noise margin) was 80 Mbps then the line will sync with a 6dB noise margin that would have a line sync data rate somewhere around 70 Mbps. So you're talking about the pillar, not the "rocket". Yeah, it's not unusual to have a good percentage of pairs become useless over the years. Especially when they are no longer connected to foreign battery DC voltages that prevent oxidisation. As more customers dumped their fax and modem lines they used on 2nd pairs in favour of a single POTS/ADSL copper pair per premises all those unused and disconnected lines rapidly started to oxidise. Again, if there aren't enough good pairs then NBNCo must install new cabling. Unlike Telstra they can't say too bad and walk away. Sounds like cheap and nasty insulation that has delaminated from the core. If that cable is between your MDF and the node then NBNCo must replace it. Oh, yeah, that's the argument that anti FTTN whingers always fall back on when their false claims about the copper VDSL segment have been disproved. NBNCo supply multiple gigabit uplink cards per node that can be upgraded to 10Gbit line cards where needed. It's no different to the GPON FTTP architecture where the ~2.5Gbps segment can have additional fibre wavelengths or higher capacity XGPON added later. But that's the backhaul which is different to the last mile access technology. There are tens of thousands of speed test posts on Whirlpool. NBNCo are the only organisation that would have the results of what every FTTN customer has been able to sync at and only the RSP's know how much CVC bandwidth they have purchased at each POI and the utilisation capacity at any particular time. But with hundreds of thousands of premises with activated FTTN connections only a very very small percentage are complaining about their service. By comparison you'll get a far greater percentage of fixed wireless or sat NBN customers complaining about their service during peak times. The posts that were accumulated to make up that graph were only added where the poster supplied accurate line distance data provided by the NBN technician or by the RSP. If you ask the NBN installer what the line length is they can tell you because they all have TDR testers in their kit. The cable sizes between customer premises and the node have all been audited to correct the errors that may have existed in outdated Telstra databases. So the velocity factors are reasonably accurate estimates. Oh and for TDR tests you don't need a modem to reply, it is all based on signal reflections based on where impedance mismatches occur on the line, so no active equipment is required on the other end. In fact during the remote node based TDR test the line must be deactivated which is why you'll lose DSL sync to complete the test. Well statistically the median line length for NBN FTTN services is just under 400 metres which is around the point that a line can just support a 100/40 Mbps line sync. So half of all customers will be able to get 100/40 Mbps speeds and the other half will be somewhere less than that. The fibre cables NBNCo use down the street are typically 12+ core fibre. It's no easy job to clean and fuse fibres together down in a hole some back hoe has dug before damaging a cable. Now don't get me wrong, I'm not saying fibre isn't an ideal medium for comms. It clearly has its advantages but the far higher cost to install it in brownfields areas just isn't justified for the speeds most people need now or in the near future. The need just isn't there to supply >100Mbps speeds to every home and no one can provide a current or future application that needs that speed 24/7. NBNCo have reported that are now less than 50 customers (and actually decreasing over time!) across the country that are paying for services in excess of 100Mbps which demonstrates that the demand for faster speeds just isn't there. Yeah, Optus are one of the worst offenders for purchasing insufficient CVC bandwidth for each POI. TPG/iiNet/Internode are also pretty bad and should be avoided if you want good peak hour speeds. But the same problems exists regardless of the NBN fixed line technology since that congestion is caused by the lack of bandwidth provisioned by the RSP for each POI. One of the worst decisions ever made in the NBN design was massively increasing the number of POI's from 14 to 121 and the ACCC is solely to blame for that. Well ideally you don't distribute broadcast TV through unicast sessions. That is why NBN offers a multicast product for that purpose. But demand has wavered because most of us no longer sit down at a fixed time to watch a program. We would prefer to catch up on the show by streaming or downloading it later at a time that we choose. Not the broadcaster. Only live sports and news broadcasts need to be multicast in real time. Netflix is on the cutting edge of the revolution be distributing shows all at the same time rather than frustrating customers with a single episode per week as per the old broadcasting model.