Another "neat" video on the GH4...

Discussion in 'Amateur Video Production' started by David Ruether, Mar 20, 2014.

  1. Here's another "neat" video covering the Panasonic GH4's
    video features:
    http://www.43rumors.com/first-look-at-the-panasonic-lumix-gh4-with-zacuto/

    This one seems clearer and better-organized than most, and
    there is mention of a new Zacuto product for it that is of
    interest to me, since it will provide "proper" controllable
    motorized zooming (plus grip-located controls over some
    camera settings).
    --DR
     
    David Ruether, Mar 20, 2014
    #1
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  2. David Ruether

    Brian Guest

    I took a look at the video David.
    It was a good video to promote the camera.

    I seem to remember that the view finder was a weak part of one of your
    Panasonic cameras so it looks like the view finder has been improved to 1.3
    million pixels on the GH4

    While watching the video a question was asked on how much 4K video you
    could record on a 32 Gig U card and the reply was less than a minute.
    Therefore a 128 Gb card would give you approx 4 minutes of 4K recording. So
    unless the camera has plenty of internal memory you are not going to be
    recording video for very long. Its going back to the days when you could
    record only 3 minutes of video on a small spool of film.
    If the camera has a usb 3.0 port then maybe you could attach a portable
    external hard drive and record 4K video to the hard drive. It would depend
    on if the cameras battery was able to power the portable hard drive. You
    could have the hard drive in your top pocket while recording.
     
    Brian, Mar 21, 2014
    #2
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  3. And to explain its features somewhat more clearly than
    I had seen before (although I think I caught it in one
    error - not bad for a "live" discussion, though...;-).
    The eye-level VF on the G6 - great color/contrast,
    but inferior sharpness to the one in the G5, so it's
    kind of a "toss-up" between them. The GH4's EVF is a
    big improvement over both. The rear screens are very
    similar on all these, though...
    No, almost double that for the EVF...
    I think you may have heard that wrong... At 100Mbps for
    4K (and figuring roughly...;-), assuming 12.5 gigs/hour
    at 25Mbps for HDV, for time/rate-comparison, and ignoring
    VBR compression-rate differences (if any...;-), for 4K
    that indicates 1-hour = 50gigs (4x25Mbps=100Mbps, so
    4x12.5MB/hr.=50MB/hr. at 100Mbps, and for a 32-gig card,
    that would be 32-gigs/50-gigs=.64hr., or about 38 minutes
    of recording time (roughly!;-) for 4K (or 19 minutes for
    1080-60p at 200Mbps...). 'Course, one can record to a
    64-gig or 128-gig card internally to increase this, or
    to an external recorder through the HDMI port for more
    time (and this also permits, for some modes, up to 10-bit
    4:2:2 video[!]). For me, sinceI never shoot long clips
    these days, and I don't need 10-bit or 4:2:2 recordings,
    one or two Kingston 32-gig SDHC UHS-1 Speed Class 3
    (Amazon $55, B&H $54) cards will do just fine for
    recording video cheaply with the GH4...
    This is "normal" procedure for "pro" users (using an
    external HDMI recorder...), and the GH4's HDMI output
    is "clean" (without overlays), and uncompressed (as I
    understand it...;-), giving the best possible results,
    with 10-bit 4:2:2 (and that with 4K can be processed
    to 10-bit 4:4:4 1080p, if you want...!;-). BTW, as a
    "throw-in" here, it's looking like the new Sony RX10
    compact camera with integrated 24-200mm-equivalent lens
    finally brings Sony "into the game" with very good video
    image-quality and with good video-related features. Still
    waiting for Canon and Nikon to do the same, though...;-)
    --DR
     
    David Ruether, Mar 21, 2014
    #3
  4. [...]

    Or, 100Mbps = 12.5MBps; 32-gigs = 32,000-MB; 32,000/12.5
    = 2560-seconds; 2560/60 = 42.67-minutes for a 32-gig
    card [which also isn't likely truly 32-gigs...;-]) Or,
    my "math" may also be "all wet".........! 8^) But, if
    not, one should be able to record about 40 minutes of
    100Mbps 4K or 1080 video onto a 32-gig card, or about
    20-minutes of 200Mbps 1080 video onto a 32-gig card...
    --DR
     
    David Ruether, Mar 21, 2014
    #4
  5. Ooops - I hasten to add to the above that the SD card
    should be one of the new SDHC UHS-1 Speed Class 3 types
    to be fast enough to sgoot video smoothly at these high
    data rates...
    --DR
     
    David Ruether, Mar 21, 2014
    #5
  6. Uh, errrr, yeah.......! That should be "shoot"....! 8^)
    --DR
     
    David Ruether, Mar 21, 2014
    #6
  7. David Ruether

    Brian Guest

    I thought that may have been an error in the video or I heard it wrong as
    no one would want a camera that could only record a few minutes of high
    quality video.

    I read somewhere that a camera or smartphone that had the 4K video
    recording feature had a limit of recording for 5 minutes so you don't use
    up all of the memory in the device.
     
    Brian, Mar 22, 2014
    #7
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