Average bit rates

Discussion in 'DIRECTV - HMC PC Playback Discussion (private)' started by PoitNarf, Apr 4, 2008.

  1. Apr 4, 2008 #1 of 10
    PoitNarf

    PoitNarf New Member

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    While I was watching some recordings tonight I decided to check to see what the average bit rate was during playback. Here's the results (all in Megabits per second):

    Late Nite with Conan (MPEG4 HD):
    - Average over 1 minute during monologue: 10.64 Mbps
    - Average over 1 minute during interview: 15.44 Mbps

    Mythbusters (MPEG4 HD):
    - Average over 1 minute: 9.6 Mbps

    South Park (MPEG2 SD):
    - Average over 1 minute: 2.25 Mbps

    Colbert Report (MPEG2 SD):
    - Average over 1 minute: 3.15 Mbps

    That's certainly a lot of data to transfer and process in real time when viewing HD content. Hopefully someone other than myself finds this interesting :D
     
  2. Apr 4, 2008 #2 of 10
    Stuart Sweet

    Stuart Sweet The Shadow Knows!

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    It certainly has a bearing on why I can play SD but not HD.
     
  3. Apr 4, 2008 #3 of 10
    mhayes70

    mhayes70 New Member

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    Yeah, I find it very interesting. Like Stuart said I think it is the main issue why we are having so many problems watching HD on our computers.
     
  4. Apr 4, 2008 #4 of 10
    RAD

    RAD Well-Known Member

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    Dripping...
    I sure would have thought that the bit rates for the MPEG4 programs would have been lower and for Conan MUCH lower, those are close to the full ATSC OTA bandwidth.
     
  5. Apr 4, 2008 #5 of 10
    tfederov

    tfederov Well-Known Member

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    Where are you getting those numbers? I'd like to try tracking mine just to see how they compare.
     
  6. Apr 4, 2008 #6 of 10
    RAD

    RAD Well-Known Member

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    Dripping...
    You could try the task manager network tab to see what it says.
     
  7. Apr 4, 2008 #7 of 10
    PoitNarf

    PoitNarf New Member

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    I went to the status of my LAN connection in Windows and monitored the received bytes (sometimes this is shown as packets instead of bytes, depends on your NIC). I recorded how many bytes had been transferred, waited 60 seconds and recorded the number of bytes after that minute. Then I had the total transfer in bytes over that minute and after some simple math I get Mbits per second. :D

    [​IMG]
     

    Attached Files:

  8. Apr 4, 2008 #8 of 10
    PoitNarf

    PoitNarf New Member

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    I just noticed that the performance monitor in Vista does a nice job as well. Although, the numbers only make sense when I monitor bytes sent and not received (very confusing...) in addition to the numbers displayed have to be in bits because they look just about 8 times too large to be bytes (even though the monitor lists it as bytes) :lol:

    Also when I was checking this out, I noticed that after recovering from 30 second skips in the application, the bits received can jump to as high as 40Mbps!!! It goes down to normal levels shortly after, but that's a HUGE jump.
     
  9. Apr 4, 2008 #9 of 10
    VLaslow

    VLaslow Active Member

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    Those numbers are about what I am getting via my wireless ethernet bridge.
     
  10. PoitNarf

    PoitNarf New Member

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    Monitored network performance during the first 10 minutes of tonight's HD MPEG4 Battlestar Galactica episode (no trickplay). Here's the results:

    Average bit rate: 6.78Mbps
    Minimum bit rate: 2.95Mbps
    Maximum bit rate: 13.26Mbps

    And I even have a pretty graph! Value listed are in bytes, vertical scale goes up to 12MBps since that's about 96Mbps (it wouldn't let me put in 12.5 to be exact to 100Mbps).

    [​IMG]
     

    Attached Files:

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