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GH4 4K Panasonic video camera, official topic
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  • heradicattorheradicattor

    thanks @Eno

  • tommytommy

    I'd like this camera! But only found a (rumour) price for the DMW-YAGH around € 2000,= Damn... that's a lot for XLR audio.... (as I don't need the rest) I'll be back once more is known.

  • Vitaliy_KiselevVitaliy_Kiselev

    @Matt

    Sensor size is same as GH3.

  • MattMatt

    No one know whether the sensor size is the same as the GH2 then?

    The GH3 was true 43ds size (smaller), whereas the GH2 had a larger sensor for multi aspect ratio... this being a panasonic sensor, I wonder if they've gone back to a multi aspect sensor yet?

  • EnoEno

    Here is the link to the original 4K samples, and some photos extracted from them: http://we.tl/tX9w9alJni Best regards to all of you!

  • Vitaliy_KiselevVitaliy_Kiselev

    Anyone mirrored the original file to download? The Dropbox account is disabled :(

    I am sure that many downloaded it. Just need to share files using better method :-)

  • heradicattorheradicattor

    Anyone mirrored the original file to download? The Dropbox account is disabled :(

  • andrew00andrew00

    I'm really interested in the GH4. I often take fashion-y pics, aka with strobes and stuff, and always like the idea of being able to take video that 'look' the same.

    GH4 seems like it's going to get nice and close. Nothing needs to change if the setup is continuous, just switch between the two.

    I'm also interested in how the 4K will look if it's modified a bit. I'm also a fan of using a Black Pro Mist and am curious about the SLR Magic Anamorphic. Wondering if the two of them + a GH4 could be nice - footage that's pretty nice and natural looking with an abundance of resolution could down sample nicely to 2k?

  • AriaAria

    I wonder if they will do a firmware update to bring this Display Overlay from the GH4 to the GH3? It sounds like something they could port over.

  • TomasoTomaso

    @dannydale Yes this was the answer to that qustion. He was also saying that by pressning any KEY the info display comes back.

  • dannydaledannydale

    In the Personal View/Driftwood interview with Mark Baber, at 19:06 Mark states that the screen info will fade from white to gray and stay on for 5 minutes while recording video before turning off...did anyone else catch that? He also said that it will dim after :30 seconds and stay on for another :30 before turning off...maybe this 1-minute cycle only happens when camera is in standby?

  • TronTron

    I'm surprised they haven't instituted pixel shift technology for the display overlays if burn-in is what they are primarily trying to avoid. My Panasonic plasma from 2005 has pixel shift and has never had any issues with burn-in. 60 seconds is a lot more manageable then the current 10 seconds but it would be nice not to have to hit a function button to get them back during a shot.

  • SuperSetSuperSet

    Bummed that the display is still going to dim and disappear after some time. It looks like the timer is now longer though (30s to dim, 60s to disappear). Will have to see how this affects operation.

  • AdamTAdamT

    In one of the interview videos (Nick's, I think) a Panasonic rep. says that the camera's processor was the bottleneck that limited 4K to 100 Mbs. The hardware just couldn't process all that data fast enough.

  • TomasoTomaso

    @Tron From the specs in the pdf posted earlier and the specs on page 1 of this post it is only 1920x1080 mov/mp4 All-I in all frequensies that can be recorded in 200 Mbps

  • TronTron

    The image sharpness looks really impressive. For proper 4K encoding they probably should have gone with at least 200Mbps though. I thought I heard somewhere that the cinema 4K mode will be able to do 200Mbps??

  • caveportcaveport

    Did some more testing in Resolve. I can see the compression macro blocks. I will try to attach some screen grabs to show the artefacts when zoomed at maximum in the Resolve viewer. I think the 4K is very good and will down convert to HD with impressive results. On a 4K screen heavy grading may make some compression artefacts visible.

    Full size.png
    1280 x 720 - 1M
    Detail full zoom.png
    1920 x 1080 - 604K
  • MattMatt

    Anyone know whether the GH4 has an oversized sensor like the GH2? "Multi aspect ratio" sensor is what they called it I think...

  • plasmasmpplasmasmp

    I was going into it thinking the 4k would be unusable at 100mb, but those samples at native 4k are impressive. Sure there isn't a whole lot of motion/contrast to stress the codec, but the sensor grain is clearly visible at 4k and not smeared - similar to the prores of the BMCC4K but at a much lower bitrate. Certainly not a repeat of the unhacked GH2 where I thought the GH4 would be starved for bandwidth.

  • EnoEno

    Thank you for the link to original samples MarcioK. Although the samples are shot from the hand, the AF is hunting a little and the DOF is extremely shallow, the quality is very good, I'm satisfied.

  • caveportcaveport

    @rNeil The colour balance was due to two different light sources. Blue on the left, yellow on the right. I did a heavy secondary correction (during my lunch break) to minimise the yellow cast and another secondary to lift the colour in the eyes. Used DaVinci Resolve and had no sizzling edges or other artefacts. I graded using the full 4K file download and rendered out to ProRes HQ 4:2:2. It looked very clean even though I would not consider it a good skin tone. At this early stage I am very happy with how the image holds up under heavy grading, and this is 8bit 4:2:0!!! Panasonic have really done a nice job with the compression on this camera.

  • rNeilrNeil

    @caveport

    good to see your comments vis a vis grading. What jumped out at me from just watching that clip above was the absolute lack of "plasticene" or red/magenta blooming. That skin looked like skin with normal human texture to it. Yea, the color balance was crap but still it was skin.

  • AdamTAdamT

    @caveport Thanks for the report -- sounds like Panasonic has a winner.

  • MarcioKMarcioK

    @caveport Since it was a photo show and the reviewer said that only had a few minutes with the camera, I guess that it is the internal 4:2:0 recorded in a SD card indeed.

  • caveportcaveport

    I just downloaded the sample clip of the girl's face and converted using Quicktime 7 to Avid DNxHD 185 10bit PAL. I then imported into Avid Symphony 6.5.2 and played around with colour correction to see how it looked. I have a Flanders Scientific monitor and a Sony 42" pro screen for grading.

    Good news for all you colour grading types. It looked great. I isolated RGB channels looking for blockiness in the colour and pushed the grades to ridiculous extremes. No artefacts, no blockiness, just a slight amount of fine grained noise in some shadow areas. I can't make any comment about 4K performance but for down converting to HD it looks really really good. I can't wait to see some samples shot with proper lighting instead of the trade show lighting that was on this clip.

    Also I suspect that this is shot to the onboard card in 4:2:0 8 bit. If 4:2:2 10 bit looks better than this then I will be one happy Panasonic customer.

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