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Bit Rate differences

Discussion in 'Pro/Adv Discussion' started by rskardon, Dec 21, 2015.

  1. rskardon

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    Hi there,

    I see one other not too publicized difference between the adv and pro units is the 40mbs/60mbs bitrate, in practical terms what difference does this make? Is it only an issue at 2.7k and above?

    Thanks,

    R
     
  2. lenmcgilvary

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    60 Mb/sec is for 4k
     
  3. Reed L

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    actually the 60mbs is for the 2.7 and last I heard was 30mbs for the 4K but it's in bits per second or mbps is megabits per second. The higher the number the faster, sooo... If you want to run some video in slow motion, the faster bit rate to begin with will give you a smoother slow motion video. It's one of the main reasons that I bought the advanced over the pro because I do a lot of slow motion clips in my videos.
     
  4. suprphreak

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    reed L, I think you are confusing bitrate with frame rate.

    For slowmo, 60fps is ideal because you can export to 30fps, 50% speed, with zero quality loss. Bitrates are irrelevant.

    Higher bitrates will have more detail captured in the video. Analogous to jpg versus raw in stills....more bits, more details, sharper video especially if there is fast motion in the image.
     
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  5. Reed L

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    DUH... I like to look dumb sometimes :confused: Yup frames per second... Anyway the P3A has the 2.7K/ 60fps where the pro doesn't or didn't offer 60fps when I bought my advanced
     
  6. Noodle

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    As of the latest 1.5.3 version of firmware, the bitrate of P3A has been increased to equal of P3P's 60Mbps when recording in 1080p/60fps mode.
    P3A's 1080p/30fps mode has its bitrate increased from 25Mbps to 40Mbps in this latest firmware too.
     
  7. Noodle

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    Ahmmm no, P3A does not record in 2.7K/60fps. 2.7K is limited to 30fps.
    In the latest firmware, P3P also offers 2.7K/30fps mode.
     
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  8. John Locke

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    Where did you see this detail? I don't recall seeing it in the release notes.
    Do you suppose this new F/W increases the image quality when using the HDMI port with goggles? That's what many folks complained about with the slower bitrate of the P3A.
     
  9. Oso

    Oso

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    Dave tried it in this thread...

    Firmware 1.5 Increased video bit rate | DJI Phantom Forum
     
  10. Oso

    Oso

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    @Noodle - If you are knowledgeable enough, would you mind making corrections to this old table I copied from somewhere a while ago?

    UHD
    4096x2160 @ 24fps - 60mbps
    3840x2160 @ 24fps - 60mbps
    3840x2160 @ 30fps - 60mbps
    2704x1520 @ 30fps - 40mbps
    2704x1520 @ 24fps - 40mbps

    FHD
    1920x1080 @ 60fps - 40mbps
    1920x1080 @ 48fps - 40mbps
    1920x1080 @ 30fps - 25mbps
    1920x1080 @ 24fps - 25mbps

    HD
    1280x720 @ 60fps - 20mbps
    1280x720 @ 48fps - 16mbps
    1280x720 @ 30fps - 10mbps
    1280x720 @ 24fps - 8mbps
     
  11. Noodle

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    Sorry Oso, all I can confirm is the two modes I have flown in so far:
    1920x1080 @ 60fps - 60Mbps
    1920x1080 @ 30fps - 40Mbps
     
  12. Oso

    Oso

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    Thanks sir.
     
  13. realsting

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    Actually 60mbs for 4K is a pretty low bit rate if you compare it against 4K (or UHD, which is 3820x2160) on prosumer camcorders that support UHD between 100mbs - 150mbs. However, 60mps would be good enough for most prosumers. Yes, it's not all about bit rate but it's something worth considering if your mixing rushes on your timeline and pushing your grading.. Though grading 4:2:0 colour spaced material is limiting too.
     
  14. Noodle

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    Well there have been a few complaints that 60Mbps for 4k in GoPro Hero 4 Black is a bit low too. So this is not new for P3P. Sony action cam has about 100Mbps for their 4k video.