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GH2 Possible Improvements
  • 288 Replies sorted by
  • EtbEtb
    +1 for Rangetogethe

    I would like to play with a tester-patch on 720p120 too, since the sensor capability is able to do (we can dream until we haven't try) :-)
  • Mark_the_HarpMark_the_Harp
    Hi all - have now got out of my virus problems (one of those ones that interrupts running of AV software and then denies access to folders).

    Anyway, I tested out bringing the CD audio into a Vegas project (44.1k audio for both CD and Vegas project settings) then imported the 50i footage (Vegas set to 25p). And yes, basically the GH2's audio is 8-9 frames ahead of the CD after 4 mins.

    Is this something to do with my settings or (strokes imaginary beard) does it reveal something about the GH2? Any helpful answers would be gratefully received!

    I can try the external resampling thing then bringing it into Vegas, but the Vegas project was actually at 44k1 anyway. I also tried directly DrDave's advice - resampling the CD track to 48k and then importing all into a vegas project running at 48k (because the GH2 audio is also 48k) but alas I still get the same issue with sync.

    The only other thing I can think of is that I made a special CD with some clicks at the start (CD at 44k1 of course) but it could be the CD player was somehow playing back slightly "fast" during the shoot.
  • Mark_the_HarpMark_the_Harp
    Thank you both - will have a good look but just ran into a virus problem on my machine so hours of fun ahead first!
  • DrDaveDrDave
    Sounds like a 44./48 sampling date issue. Resample the audio to 48/32 float in a separate audio editor, check the the total time matches you clip, and reimport in the NLE
  • bdegaziobdegazio
    @Mark_the_Harp
    8 frames in four minutes is suspiciously close to the pull down rate of 2 frames per minute. Maybe Vegas is pulling down your CD audio (therefore causing the gh2 pix to appear to run fast?)
  • Mark_the_HarpMark_the_Harp
    @DrDave I think that's my comment - it was probably more than 8 frames to be honest. I was just using the GH2 stand-alone, ie nothing connected to it, if that's what you mean. I didn't think I'd need to have it sync to a clock source (I don't bother with my other cameras) and not sure if / how you would do that anyway on the GH2. I was basically picking up the sound of a CD player in the room, and that same CD track was also imported into my editor (Vegas pro 10) along with the GH2 footage and synced up using the GH2's audio, and only later when I cut up the clips, did I start to discover the drift. I never thought of checking both ends of each long take first, as I've never had this issue over such a short time before.

    Thinking about it, maybe there was some weird sample rate or CD-player thing going on between the imported timeline file and the CD / CD player in the room. So perhaps I'm blaming the GH2 for nothing. I'll do an experiment today directly playing the timeline and audio recording it on the GH2 and importing that back into the timeline to see if there's any drift. If there isn't, then it's probably just the CD player doing something weird.
  • DrDaveDrDave
    Quote
    Typically, over 4 minutes I find it's drifted so it's slightly early by around 8 frames
    End quote
    Mine does not drift like this. 8 frames in four minutes is a lot. If you can borrow a superclock or an RME you can double check it. What is your clock source?
  • Roy_BattyRoy_Batty
    Un-squeezed 2.35 in the LCD.
  • fehafeha
    Some ideas (wishes) :
    1. if possible variable movie mode add more options like:
    500%, 700% , 1000% or more great for timelapse video :-)
    2. Global quality recording modes in Mbit's (at least up to 44)
  • ElenionElenion
    Hi, what about different color curves that can achieve the highest possible dr and latitude? It could be useful because currently i found the images of the gh2 a little too compressed to be graded properly, compared for examples with the images of the fs100 (that as almost the same bitrate)
  • Mark_the_HarpMark_the_Harp
    Hey - three in a row!

    I'm in the middle of editing a music video and rather annoyingly I'm discovering the GH2's sync drifts by quite a bit. Typically, over 4 minutes I find it's drifted so it's slightly early by around 8 frames. I only discovered it when I ditched my 2 XHA1 camcorders and decided to do the whole shoot on my GH2. So now I've got better low-light pictures, but I'm spending a long time trying to tidy up this sync issue. I was shooting in 1080i 50 to keep it consistent with the first shoot, where I used both XHA1s and GH2.

    I guess there's no way of curing this beyond obviously just having to sync all 60+ timeline clips manually. Just very annoying! Didn't think I'd ever get annoyed with my GH2 but there you are.
  • Mark_the_HarpMark_the_Harp
    ...and I believe @tttulio that peaking would be good too. In both cases it would be great to switch them on and off during recording (in other words, just use them for a quick check). The advantage of peaking is that you still get to see the whole image.
  • tttuliotttulio
    Something simple but that would make all the difference:
    Being able to use the Focusing Magnifier function WHILE filming.
    It is agreat tool to focus correctly before shooting, but after you start recording, it goes away. People tend to move and so does the camera...
    Thanks
  • ElenionElenion
    I hope that after major improvements someone will concentrate on bringing back the af tracking during video 'cause it is definitely a must if you want to focus with a handheld steadycam with a normal lens.
    I'd like to help testing but the problem is that i've no competences in this field and i don't know what and how to do the tests you need. I think i'll wait when things will be more clear
  • MattMatt
    @Angry_c

    Then you've not been pixel-peeping properly. ;) Take a look at this video... the colour issues are clearly apparent on the faces when they aren't in focus...



    There are no technical reasons why it would only happen on skies... all colour gradients are affected.

    If there was some way that Vitaliy could make the MJPEG mode run at different framerates (probably not possible like the GH1?), it would mean that it would be a great mode to film in, because the colours are so much better. Sure you'd loose some resolution only being 720p, but for many people it would be worth it. Either that or a fix for the AVCHD mode's 8-bit compression to dither or something... that's probably not possible either unfortunately. :(
  • Angry_CAngry_C
    @Matt:

    shot bright blue sky, which goes to dark blue sky. I ever saw the bending problems only in this situation.
  • MattMatt
    @_gl

    Isn't the GH2's MJPEG mode 10-bit anyway? Take a look at this video...
    even the source file (raw from the GH2) doesn't show any colour banding issues that plague GH2 AVCHD clips. Take a look at that blurred background...
  • B3GuyB3Guy
    5k and 1000fps are clearly not possible, and you'd know this if you'd read the thread. As for the coffee, you must not own a GH2. Mine makes coffee quite well, and I'm sure I've seen "freddo cappuccino" in a submenu somewhere. Perhaps others can confirm this.
  • stefanosstefanos
    @Rangetogethe
    how about 5k 1000fps and the ability to make freddo cappuccino coffee:)
  • RangetogetheRangetogethe
    Improvements:
    - 1080p60
    - 720p120
    - 1080p25
    - alot of different framerates (EG. 48(2*24), 72(3*24) for slowmo or 22fps for speedup in action scenes).
    - Overall higherbitrates
    - 4k res
    - 4:2:2 MJPEG
    - 4:3, 1:1.85, 1:2.35 aspect ratio's (if possible with ETC).
    - Lower ISO values
    - Ability to lock the focus while in auto focus
    - Automatic appliance of the 180degree shutter rule
    Thanks!

  • sparedogsparedog
    @-gl, i use apple compressor to convert to uncompressed 10bit. in compressor, the input/output is true 10 bit, yes?
    but now i've just discovered grading in photoshop cs5 with smart objects, nice.
  • _gl_gl
    ? I pointed out clearly that it may not be possible for several reasons.
  • Vitaliy_KiselevVitaliy_Kiselev
    @gl

    This topic has word improvements and not fantasies for a reason :-)
  • _gl_gl
    Well GH2 RAW images hold 12bits, so the sensor can do it. But it's unknown if video sensor modes support it (maybe). Apparently MJPEG can support 10bit, but again it depends if the GH2 implementation allows it. Would of course be nice!

    EDIT: ... of course then the question is, what software can actually load 10bit MJPEG (without sneakily converting it to 8bit)? Anyone know?
  • sparedogsparedog
    @_gl, thanks i have now read up on it and now understand it.
    what do you know about bit depth? in theory, would we be able to get 10bit mjpeg from the sensors?
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