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GH2 Possible Improvements
  • 288 Replies sorted by
  • _gl_gl
    @sparedog, the sensor isn't capable of 4:4:4 (Google 'Bayer Sensor').
  • bwhitzbwhitz
    What is it in the GF1 that allows 4:2:2 recording?
  • sparedogsparedog
    does anyone know if 4:4:4 is possible within the mpeg codec standard?
  • roguebotroguebot
    @Chaos123x Even at an incredibly high bitrate the AVCHD codec would still compress the image and result in a loss of information. Prores still compresses the image even though it's "theoretically lossless", but having a clean HDMI signal would mean we could record an uncompressed/lossless signal.

    The difference may be negligible to some and huge to others.
  • Chaos123xChaos123x
    If you get the bit rate up on the 24P H setting would we even need prores recorders?
  • alcomposeralcomposer
    @Vitaliy "Good thing is that some HDMI related functions names are present is some debug messages as well as their arguments names."

    You have to be having a laugh regarding the "HDMI Debug messages"- considering that there never was a bug until Panny introduced it! :-D
  • Vitaliy_KiselevVitaliy_Kiselev
    @Chaos123x

    No one can answer you precisely.
    Good thing is that some HDMI related functions names are present is some debug messages as well as their arguments names.
  • Chaos123xChaos123x
    What are the chanced that the hdmi out cadence problem can be fixed with Ptools?

    Love to have the option to use a Atomos Ninja of other ProRes recorder with the Gh2.
  • JaapsbJaapsb
    @Vitaliy, I understand you think it"s not a big deal about those questions about Composite out during video, but I can link to a huge list off forums, with a lot of people around the world who are waiting just for this.. Because the GH2 is the perfect camera for aerial video with Multirotors, because off performance /price/ sensor /and most important weight. (The aternatives like a go-pro we can not use for prof. video.)
    On board we can not have much more adapters, converters, etc. those need power and adds weight again.
    So please, have a look at it, take your time, but if not, it's not. And we all know the answer then.
    Regards, and good luck ! ;) Thanks in advance for looking at it!
  • lenuisiblelenuisible
    On the HDMI topic, I was wondering if HDCP was not the reason why HDMI monitoring was not working on all HDMI LCDs.
    Vitaliy, did your investigations allow you to know if HDCP is used somehow, or it is still too early (or even impossible) to identify these HDMI stuff ?
  • alcomposeralcomposer
    @EOSHD
    "There is a colour space shift which causes gamma to change in that mode, and of course it is interlaced which is bad for the Ninja. If we can change HDMI sensor mode, it would really help. The gamma change alone is very distracting when gong from live view to record, and it is live view where the exposure is done."

    After reading quite a few articles- I think that live view is RGB- then when record is enabled- its YUV- currently the jury is out as to what the HDMI chroma issue is- but there is a massive issue with cadences- with lots of frames just added in to pad the video (in 24p 1080i50). For 1080i50 there is no padding- but the lower field is sometimes written at the same time that the upper one is- thus it jumps around I think about once a second, (don't think it is that regular either). Currently one could just deinterlace the upper field only from the HDMI- and lower field only from the AVCHD- and then just combine the two- but the question is how much you gain depending on how much of a headache you get from doing that! Think that we should make a HDMI & Interlaced discussion board topic... As these are two very important issues.

    Cheers.
  • ImaginateImaginate
    I'd like to see if its possible to hack a new 1.85:1 gridline overlay as an optional choice for the display
  • alcomposeralcomposer
    @EOSHD

    Sorry to make this sound like a football game- but "Yes- Yes Yes!". HDMI is one of the most important aspects to this camera... and this was actually something that was working 100% before firmware 1.0! Hopefully the code is still inside the firmware - just deactivated... :-D

    I for one am VERY (if not completely) interested in the HDMI aspect of this camera- for me- a fix for this achieves many if not all of the objectives for this project (higher bit rate- quality etc).

    Cheers,
    Alex
  • EOSHDEOSHD
    I'm very interested to see what the sensor mode is for HDMI :)

    There is a colour space shift which causes gamma to change in that mode, and of course it is interlaced which is bad for the Ninja. If we can change HDMI sensor mode, it would really help. The gamma change alone is very distracting when gong from live view to record, and it is live view where the exposure is done.
  • nitai_chaitanya_anynitai_chaitanya_any
    Actually my #1 improvement to make this camera more usable would be to change the ISO while recording in small (like 100) increments.
    Otherwise the codec is very good and with an external monitor with peaking, 1-to-1 focus, waveform monitor, etc. your pretty well setup. However for documentary stuff with multiple GH2's having to stop and start to change the ISO is terrible.
  • sparedogsparedog
    do you think 4:4:4 mjpeg would be possible?
  • coptercopter
    Hi Vitaly,

    I also need composite video out while recording video badly. There is a huge aerial photo scene which is waitng for that. We could use a HDMI-composite converter but it DOES NOT WORK, HDMI signal changes, while video recording starts, and is not convertible by the HDMI converter (fro what reason, I do not know). When you do not record the HDMI signal can be converted.
    But of cours everyone wants a picture while recording, best would be composite anyway.

    Regards
    copter
  • flashflash
    Yes Gopro is bad quality ;) And the wireless HDMI transmitters have big latency...
    Thank you very much Vittaly for answers :-)
  • Vitaliy_KiselevVitaliy_Kiselev
    @flash
    Contact this guy - http://shop.ebay.com/rastamansar1/m.html?_trksid=p4340.l2562
  • v10tdiv10tdi
    @flash - what about GoPro Hero HD? Not quite GH2 picture quality, but I believe it does have composite out - and cheaper if something goes wrong. Skeleton case should allow wire connections (including 5v mini USB power if flight is longer than couple of hours).

    Just an idea.
  • flashflash
    If you hold Trashcan button during few seconds you can activate the back video and see on a Tv (or monitor) what you are targeting with GH2 but if you hold Record button the back video disappear :(
  • flashflash
    If you could have a look it would be very cool
  • flashflash
    It is of the weight in more and that consumes some electricity.
  • Vitaliy_KiselevVitaliy_Kiselev
    @flash
    How about small camera that will be shooting GH2 LCD screen?
    Chinese are selling bunch of them with RCA out and wires to power it.
  • flashflash
    I need it because the video sender on my RC helicopter have only COMPOSITE IN (like all video sender on RC helicopter they work only one in composite).
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