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Dropped Frames?

Discussion in 'Videography' started by (c)ow, Oct 5, 2018.

  1. (c)ow

    (c)ow Premium Member

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    pixelstate recently Please login or register to view links about stutter/lost frames. Now I have also two examples where, other than in his clip, I didn't do fast pans.




    Subtle but noticable.

    My setup/settings:

    -XH1 with XF16-55 mm lens
    - FHD, 25p, f-log
    - Battery grip, boost mode "on"
    - 1/50 s, ISO 800, f/5.6 (2), WB fixed
    - 2x SanDisk Extreme PRO 32 GB (SDHC II, 300 MB/s), sequential mode
    - IBIS on

    Any idea as to what's going on? In the post of pixelstate I asked already wether it's related with writing speed to the card. But in my case I have very fast cards.

    Thanks,
    Oli
     
    Last edited: Oct 5, 2018
  2. (c)ow

    (c)ow Premium Member

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    Nobody any idea??
     
  3. pszilard

    pszilard RemektekMedia.com

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    Check the floor under the camera. Might have dropped there... Just kidding. What memory cards are you using? Test their write speed, if you can.
     
  4. bralk

    bralk Premium Member

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    IBIS?

    I had the same problem with a Panasonic video cam with ibis active
     
  5. (c)ow

    (c)ow Premium Member

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    That would be a bummer. IBIS should be beneficial for handheld video shots...
    Ah, one more thing: my XT20 did it also, no IBIS.
    When I return home from BKK I‘ll check the speed of my SD cards. The Blackmagic tool should do
     
  6. (c)ow

    (c)ow Premium Member

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    Did a speed test with two different tools: Blackmagicdesign Disk Speed Test and HELIOS LanTest. I used a Lexar highspeed SD card connector for UHS II -> USB 3, because my internal card reader is far slower. Here are the results for 3 different cards:

    upload_2018-10-17_9-32-3.png

    What does this test tell? Obviously I used the fasted card for video recording. But is write speed really the problem? Are there faster cards out there (that work proper with the XH1)?
     
  7. Greybeard Photography

    Greybeard Photography Premium Member

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    Just checked the Fuji site and it seems that the X-H1 is only operating at 50Mbps for FHD 25p so its unlikely to be the card - even the Sony card should be able to manage that.

    Do those speed test programs show minimum write speed or is that average?

    I have wondered about this with reference to the X-T3 and 400Mbps. Does the video stream bypass the buffer? I've never seen anything on this subject.
     
  8. (c)ow

    (c)ow Premium Member

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    The HELIOS app does 10x write/read operations and averages the result. From the BM app I just read the value.

    The sample videos were shot with these settings:

    1080p, 25 FPS, F-log, 100 Mbps

    The 100 Mbps recording speed is below the measured write speed of the SanDisk card, which I've used for the above videos. Still I don't understand this phenomenon.

    EDIT: I just realised that the bitrate of 100 Mbps translates to 12,5 MB/s (not 100 MB/S). Got confused with bits and bytes...
     
    Last edited: Oct 18, 2018 at 7:09 AM
  9. (c)ow

    (c)ow Premium Member

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    I think it is a problem between keyboard and chair :rolleyes:
    The above clips were shot at 25 fps and my timeline in Resolve is 24 fps. Putting them in a 25 fps timeline the problem is gone...
    Sorry for being such an ignorant :oops:.
     
  10. Greybeard Photography

    Greybeard Photography Premium Member

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    That's a relief - no need to worry about card speed
     

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