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    #21
    Junior Member
    Join Date
    Sep 2010
    Posts
    14
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    First I want to thank lPowell for all the work you are doing for the benefit of all. This is my first post after a lot of time reading yours. I've experimented with all the settings and I've reached my own conclusions. Mixing various settings, I use the one here today show if anyone wants to try. The result is exceptional 1080pN/25 with only one failure (read speed) in many months of use and according StreamParser any empty frames. I do not know if it can be useful for someone. 48Mbps average in high detail scenes, without mud, and some peak of 100Mbps !!!!!. I understand that is not 100% reliable, but its quality is exceptional. In 720p/50 I get plenty of empty frames and its not usable, but incredibly ok for 1080pN/25.

    Thanks everybody.

    Settings:
    Prevent version compare=Checked
    Third-party battery=Checked
    All Interface Languages=Checked
    30min limit removal=Checked
    PAL<->NTSC Menu=Checked
    720p30 width=1440
    720p30 height=816
    720p30 420->422 color sampling=Checked
    E1 Quality=280
    E1 Table=4
    E2 Quality=250
    E2 Table=10
    E3 Quality=225
    E3 Table=24
    E4 Quality=200
    E4 Table=48
    Native 24p/25p=Checked
    Video Bitrate FHD/SH=51000000
    Video Bitrate H=29000000
    Video Bitrate L=17000000
    Overall Bitrate=61000000
    720p50 GOP Size=20
    720p60 GOP Size=20
    1080p25 GOP Size=15
    1080p24 GOP Size=15
    Preset bitrate=545
    Overall Bitrate 2=61000000
    Constant for 1080p=5184000
    Constant for 720p=518400
    Framerate related comparison=12


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    #22
    Default
    This patch looks v promising. Many thanks lpowell and blackout.

    For those without anamorphic adapters, what pixel squeeze factor should one use in post (in a package like AE) to eliminate the horizontal stretch correctly?


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    #23
    Default
    Thanks, Blackout and lpowell, for your continuous effort. After installing the patch I had 4 card speed errors in FHD 24p with high detailed green foliage after about 15-20 sec in the clip (using the 14-140 kit lens and a 8 gb class 10 sandisk). So it seems that stability is still an issue to some extent. Nevertheless, it is a great feature and I will continue to use the 24p mode. As you mentioned at the beginning of the thread - it is rather predictable at what type of shot the cam will fail. So one can avoid these shots to a certain extent. Great work
    Joho
    ____________________________
    www.vimeo.com/album/1580551


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    #24
    Member
    Join Date
    Dec 2010
    Location
    Germany
    Posts
    55
    Default
    Hi everyone, I know this question has been posed very often, but I still can't find an exact answer:

    What's the advantage of 25pN over just record in 50i and then put it into 25p timeline?
    I've read that there's a difference in color, but then in another thread I read there is no difference.

    So, what's the advantage of this hack if I'm in PAL-country?


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    #25
    Senior Member
    Join Date
    Feb 2010
    Posts
    908
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    "The key to stabilizing the Native 24p patch was finding a way to eliminate the sporatic occurance of empty P-frames in the video stream. Once I figured out that trick, I fine-tuned Blackout's average and maximum bitrates to match. Nothing was more stable than Blackout's original12-frame GOP, which I used in 25, 50, and 60fps modes as well."

    so what was the trick?

    Now that my GH2 is coming, I can mess with the GH1 settings a little bit again before my next shoot. I'd like to shoot native 24p but still can't handle the R/W speed failures during production.


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    #26
    Junior Member
    Join Date
    Sep 2009
    Location
    Dallas, TX
    Posts
    29
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    I've been chomping at the bit to put a native 24p patch on my camera.

    Does this patch still disallow in-camera playback? That is a near deal-breaker for me as the HDMI out only works for playback and when on set I need to playback takes for the director.


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    #27
    Senior Member
    Join Date
    Mar 2010
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    2,524
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    Quote Originally Posted by CalebStephens View Post
    Does this patch still disallow in-camera playback?
    All AVCHD files produced by the Blackout-Powell Native 24p Patch should play back normally in-camera. The MJPEG files produced by this patch, however, will not play back in-camera.


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    #28
    Senior Member
    Join Date
    Mar 2010
    Posts
    2,524
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    Quote Originally Posted by onion View Post
    For those without anamorphic adapters, what pixel squeeze factor should one use in post to eliminate the horizontal stretch correctly?
    When shooting in MJPEG HD mode with a normal, non-anamorphic lens, you'll need to vertically stretch the patch's 1920x720 frame out to the standard FHD 1920x1080 frame size.


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    #29
    Senior Member
    Join Date
    Sep 2010
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    655
    Default
    So is a stable 1920x1080 MJPEG just not possible? Is that the reason for the 1920x720?


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    #30
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    Mar 2010
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    Quote Originally Posted by CColton View Post
    So is a stable 1920x1080 MJPEG just not possible? Is that the reason for the 1920x720?
    A Full HD 1080p frame produces too much data for the MJPEG codec to handle reliably. The 1920x720 MJPEG mode in the Blackout-Powell Native 24p Patch is the widest that will support 4:2:2 color depth at moderately high bitrates of around 50Mbps. It also works natively with 1.5X anamorphic adapters, which will produce widescreen videos that require no stretching in post-production.


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