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Feed: World Judo Championships in HD @ 16° East

Discussion in 'General TV Discussions Forum' started by Abstrakt, Sep 7, 2005.

  1. Abstrakt

    Abstrakt
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    Greetings HD fans,

    Alfacam’s OB11 unit is in Cairo, covering the 2005 World Judo Championships for Japanese TV. This feed is almost certainly being picked up by BT in London and relayed via fiber back to Japan.

    Eutelsat W2 @ 16° East
    11138 V, FEC: Auto, SR: 26042
    VPID: 133, APID: 134


    Video: MPEG-2 HP@HL, 1920x1080i/50, 4:2:2, 37.5 Mbps
    Audio: MPEG-4 AAC, 688 Kbps

    Cheers.
     
  2. Muf

    Muf
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    Thanks Abstrakt,
    Just a test card at the moment, the event starts tomorrow I believe.

    Jim.
     
  3. Abstrakt

    Abstrakt
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    Keep checking it today as well; you might catch some interesting sights. ;) Earlier today there were shots from inside the dojo, with performers rehearsing what I assume will be the opening act... And only minutes ago there was a liveshot of a lady reporter (from NHK I believe.)

    Cheers.
     
  4. RecordablDVDfan

    RecordablDVDfan
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    Nothing on my quali, is it active at the moment ? Incredibly high video bit rate is'nt it ?
     
  5. Abstrakt

    Abstrakt
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    Not active at the moment -- check back tomorrow around noon.

    That bitrate is normal for a high def feed... In fact, It’s not unusual for standard def feeds to average 15 - 20 Mbps for a single video stream. It’s when you’re dealing with channels on DTH birds, where bandwidth is at a premium, that bitrates get drastically reduced and compression artifacts rear their ugly heads.

    Cheers.
     
  6. RecordablDVDfan

    RecordablDVDfan
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    So this is about as pure HD as you'll get then ? HD1 is only 18 Mbps I thought. Good test for an HTPC
     
  7. Abstrakt

    Abstrakt
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    The purest HD you’ll get is 10-bit uncompressed, which runs at something around 1.5 Gbps. But even the most sophisticated post houses won’t work at those bitrates; they’ll usually work at around 220 Mbps using proprietary systems like the Avid Nitris.

    But I digress… As far as MPEG-2 goes, yes, HP@HL is the highest possible profile. The bitrate can still go much higher than 37 Mbps though; the real limiting factor here is the transponder’s bandwidth. Given a typical 36 MHz transponder, you can’t go higher than roughly 40 Mbps using DVB-S modulation. So you’ll either need a higher bandwidth transponder (they exist, but 36 MHz is already monstrously expensive), a new modulation (DVB-S2 doesn’t help much, you just gain a few megabits) or a whole new video codec. This is why everyone is so eager to dump MPEG-2 in favor of more efficient codecs.

    And regarding Euro1080/HD-1, yes they use the lesser MP@HL profile along with a bitrate that is admittedly lower than a high quality contribution feed in standard def… But that doesn’t mean they are doing anything wrong. 18 Mbps is a very respectable bitrate for a DTH high def broadcast.

    Cheers.
     
  8. RecordablDVDfan

    RecordablDVDfan
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    Thanks fo rthe info, very informative! At the moment I am getting a very weak unlockable signal on 11.138 with a 1m dish, is this it ?!
     
  9. mediamogul

    mediamogul
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    Thanks for the info, but im getting no signal on my quali well 20% but its not locking at the moment
     
  10. RecordablDVDfan

    RecordablDVDfan
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    Yep some here about 20%, must be on low power
     

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