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Noise Test: Panasonic GH2 with Driftwood's 176mb GOP1
  • GabelGabel
    With the hack we all know how noise has become more apparent (because of the sharpness). I figured that it was time to test out and see the levels at different ISO values. So here are my results (since I'm not a Vimeo-pro member, there is some bad compression, but have the originals available for upload).

    I shot 10 seconds (which now might have been too long) at each ISO value, with the body cap on. Settings were:
    - Driftwood's "GOPStoppa" GOP1 176mb hack.
    - White balance at 5600K
    - Shutter at 50

    I've upped the mids in After Effects quite a bit.

    The major surprise was 320, which looks awful... Shot a second one, but had the same results! Very surprising...

    Here's the video:




    And the link to the original clips:
    http://www.megaupload.com/?d=5M4N08F1
  • 78 Replies sorted by
  • chriscalifanochriscalifano

    Robbin here is a better example

  • robbinrobbin

    Im at work atm so cant see how much grain there is. But footage seem under exposed. What iso where you using?

  • chriscalifanochriscalifano

    I picked up the gh2 and immediately hacked it. In this test video i shot on the hacked gh2 with a kit lens. I found that in almost all the videos there was digital noise as you will see in this video. I thought that maybe the light was the cause of the problem, but it shows up in light too! I'm wondering if its just my crappy kit lens. Please help me out. Perhaps my gh2 film settings are incorrect? I currently have it on cinema 24p. Smooth -2,-2,-0,-2

    http://vimeo.com/m/56618981

  • Ian_TIan_T
    @Giant_Steps Go here:

    http://mirillis.com/en/products/splash.html

    Download the free Splash player. Press play then right click anywhere on the screen and select "information." It will give you the info you are looking for.
  • balazerbalazer
    Use VLC to get the bit rate. (multiply by 5/4 to account for the slow motion) Aquamotion tops out around 100 Mbps.
  • freeheelsfreeheels
    Try mediainfo, its a snapshot but gives you a decent idea
  • Giant_StepsGiant_Steps
    Stream Parser wouldn't open on my Mac - it said there were problems.

    Anyone know what the Aquamotion Mbps rate is?
  • adventsamadventsam
    Download stream parser, somewhere you will find it on here and it will tell you.
  • Giant_StepsGiant_Steps
    Tested Driftwood Aquamotion. Fantastic. Can't believe the lack of noise. I'm using on 80% 30p Variable setting. I'm used to shooting P2 2700 Varicam 10bit 422 AVC-Intra100, and hard to believe but this it is looking brilliant.
    Using Canon 70-200 2.8 wide open with Vari ND.

    Unless you have a better idea I think I'll stick with Aquamotion. What is Mbps rate with this patch?
  • alcomposeralcomposer
    @exilenorth what lens is that? Nikon 24mm f2.8? Looks great!
  • Giant_StepsGiant_Steps
    I can't open up any of these files - like the SmoothAsFuck - I click on it in my Mac browser and nothing happens. I have Wine Bottler open... Sorry for the stupid question but I just don't know.

    EDIT: Never mind - I opened in Text Edit
  • balazerbalazer
    Driftwood's 176 Mbps patches aren't meant for 30p. You can use his Aquamotion, which is meant specifically for 30p and/or ETC, or SmoothAsFuck, which I've also found to work well in 30p. And I'm not sure what card you are talking about, but most of us have been using the SanDisk Extreme HD Video cards with success.

    http://personal-view.com/talks/discussion/953/gh2-patch-vault-most-popular-patches-in-one-place#Item_11
  • Giant_StepsGiant_Steps
    Hey Guys,
    Newbie here. Working with 176mb Driftwood patch. I prefer to work in 30p - my clients like the look. So I'm using the 80% Variable mode w/Sandisk Class 10 8GB HC1 card. I'm getting around 4-5 seconds and then it stops with the card message. Though on some less-busy static shots it can go nonstop. What's up? Is this the right card, or am I going to have to go with a slower patch? Also, is there a dedicated 1080/30p setting and I'm missing it? Thanks - love the short clips - incredible.
  • proaudio4proaudio4
    Thanks driftwood
    I forgot about that > ("start at a high ISO, quick recording, then back down to the lower iso")
    Very strange to say the least.

    I need to find some time to test these ISO differences and quirks.
    Hopefully Vitaliy can find an avenue to fix this in the code.
  • proaudio4proaudio4
    Just to make some assumptions clear...

    The hack and it's high bitrate settings don't make noise (of course...)
    It's not like Vitaliy added special code to add noise. LOL ;)

    The fact is, noise is an analog medium and is at the lower thresold levels emitting from the cameras sensor.
    Like analog, video has a noise floor. Some sensors and initial image signal processors and A/D converters have better signal-to-noise specs over others. It's then encoded to a digital medium.

    The GH2 stock "lower quality" AVCHD compression is smearing the fine detail (Remember, noise is fine detail too).

    With these high bitrate high quality AVCHD settings (thanks driftwood and others), we are now seeing closer to the "true" output of the sensor. NOW noise appears finer and more natural appearing. The noise is not as smeared by the lower ACVHD compression. Also, if we choose to remove noise in post, the higher quality image allows us to make a better model of actual noise for better noise removal.

  • driftwooddriftwood
    Remember to try and start at a high ISO, quick recording, then back down to the lower iso that you originally need. The GH2 can sometimes screwup.
  • Greek_m43Greek_m43
    @cosimo_bullo I did, it was an outdoor shot and the anchor's gray jacket still had noise
  • cosimo_bullocosimo_bullo
    Hi @Greek_m43. Try standard at iso 160 if you haven't already and tell if that affects noise. We're currently getting an all but noise free image in many settings.
  • Greek_m43Greek_m43
    I'll post some examples later on, but no matter what patch I use, even going from the original, I always get annoying noise in the greys. Right now I'm using the newest @driftwood patch reAQ
  • danyyyeldanyyyel
    yes seems so.
  • hiroshisaitohiroshisaito
    @brianluce, @proadudio4
    I didn't use noise removal software or plugin indeed. Just shoot with custom colour profile and over-exposure (and colour correct).
    Btw, The latest dfitwoods' patch is really awesome, I think it solves the noise issue.

    Hiroshi
  • apixapix
    @exilenorth
    What kind of flash card are you using?
    nice video :)
  • brianlucebrianluce
    @proadudio4
    But Hiroshi didn't say he used noiseremoval software.
    @exilenorth
    Wow, that is impressive footage. My unhacked gh2 for sure wouldn't get that shot. What ISO were you at? Settings?
  • cosimo_bullocosimo_bullo
    @exilenorth - great handle! Where are you located?!

    Have you compared the 244 vs 176? Any thoughts for low light superiority?
  • nomadnomad
    Driftwood has published different, optimized settings for 1080i50.
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