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  1. Collapse Details
    Quote Originally Posted by Greg_E View Post
    When you are transcoding, what are you setting to make it 24p. Not sure why I'm asking as I'm selling my GH1, but just worth the info.

    Somehow the interlaced recordings have a lower overall bit rate, even though they are twice the frame rate (24p vs. 48i), I still don't quite grasp this. Same goes for the ATSC 1080 30psf standard (60i vs. real 30p), it's really just the odd lines of a 30p frame in one field, and the even lines from that same frame in the second field. Bit rate should be the same but somehow this segmented frame allowed for broadcast where a real progressive frame did not.
    I'm not entirely certain how to explain the latter but far as transcoding I'm just using Aiseesoft MTS converter and choosing 24fps as the target (it identifies the original MTS file as 24fps) into a DNxHD format.

    I ran this GH13 SreamParser on the original file of the video here (since MediaInfo still identify it as 24fps, but also notes its interlaced)

    With the information box containing :

    File: B:\Videos\2017-07-13 Pens\PRIVATE\AVCHD\BDMV\STREAM\00000.MTS
        Size = 2,511,372,288 Bytes (13,080,064 Packets)
    Stream: Max Speed = 220,595,700 bps
        Mode =  (actual frame rate is half)
        PCR Timing Interval = 0.095 seconds
        Clip Time = -7:-444:24780.00
        Average Total Bitrate = -742,460
        Average Video Bitrate = 548,693
        Average Audio Bitrate = -4,900
        Average Other Bitrate = -16,491
        Max GOP Size = 2,906,496 Bytes (23,251,968 bits)
        Video Frame Size (Min/Ave/Max)= 26,112 / 184,088 / 395,136
    Frame: Video P Frame
    Bitrate viewer for that video :

    And MediaInfo states

    ID                                       : 0 (0x0)
    Complete name                            : B:\Videos\2017-07-13 Pens\PRIVATE\AVCHD\BDMV\STREAM\00000.MTS
    Format                                   : BDAV
    Format/Info                              : Blu-ray Video
    File size                                : 2.34 GiB
    Duration                                 : 9 min 24 s
    Overall bit rate mode                    : Variable
    Overall bit rate                         : 35.6 Mb/s
    Maximum Overall bit rate                 : 120 Mb/s
    ID                                       : 4113 (0x1011)
    Menu ID                                  : 1 (0x1)
    Format                                   : AVC
    Format/Info                              : Advanced Video Codec
    Format profile                           : High@L4
    Format settings, CABAC                   : No
    Format settings, RefFrames               : 2 frames
    Codec ID                                 : 27
    Duration                                 : 9 min 23 s
    Bit rate mode                            : Variable
    Bit rate                                 : 34.0 Mb/s
    Maximum bit rate                         : 16.6 Mb/s
    Width                                    : 1 920 pixels
    Height                                   : 1 080 pixels
    Display aspect ratio                     : 16:9
    Frame rate                               : 24.000 FPS
    Standard                                 : NTSC
    Color space                              : YUV
    Chroma subsampling                       : 4:2:0
    Bit depth                                : 8 bits
    Scan type                                : Interlaced
    Scan type, store method                  : Separated fields
    Scan order                               : Top Field First
    Bits/(Pixel*Frame)                       : 0.683
    Stream size                              : 2.23 GiB (95%)
    Color range                              : Limited
    ID                                       : 4352 (0x1100)
    Menu ID                                  : 1 (0x1)
    Format                                   : AC-3
    Format/Info                              : Audio Coding 3
    Format settings, Endianness              : Big
    Codec ID                                 : 129
    Duration                                 : 9 min 24 s
    Bit rate mode                            : Constant
    Bit rate                                 : 192 kb/s
    Channel(s)                               : 2 channels
    Channel positions                        : Front: L R
    Sampling rate                            : 48.0 kHz
    Frame rate                               : 31.250 FPS (1536 SPF)
    Bit depth                                : 16 bits
    Compression mode                         : Lossy
    Stream size                              : 12.9 MiB (1%)
    Service kind                             : Complete Main
    So I'm not entirely sure how 48i is being woven or if it's basically 24psf (which splits exactly half of two frames into one frame at any given time and can be easily deinterlaced).

    The way it was described by humpman when I asked the same on personal-view was

    @kbeezie i don't clearly underastand your problem, but:
    Stock GH1 NTSC mode is 24p and it's packed in 60i interlace with 3:2 pulldown video file.
    With "2997i to 2400i" 24p will pack in to 48i interlace without 3:2 pulldown file.
    Can't see problem here.

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  2. Collapse Details
    Hi, I just wanted to say thanks for the hack and the patches. I bought a second hand GH1 to play with it a bit and I'm enjoying experimenting with the different patches

    I did a test just for fun, comparing my small GM1 with the GH1 updated with this patch in a static scene at ISO 1600, and the results were surprising (at least for me). The sensor on the GM1 is so much better at high ISOs, that the higher bitrate doesn't matter much (GM1 around 22000kbps, GH1 around 35000kbps).
    On the GH1, Smooth film mode with everything on -2 except color. On the GM1, normal mode with everything on -5 except color.
    It looks like the GH1 is slightly brighter at the same ISOs than the GM1.

    A few crops below (GM1 left, GH1 right:




    The GM1 crops more from the Panasonic 20mm 1.7 than the GH1 in video.

    The videos:

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  3. Collapse Details
    Senior Member
    Join Date
    Feb 2009
    Long Island
    It's been way too long, but the GH2 is the icon for these patches...

    35 Mbps is kind of low. Once you start getting into the 150/175 Mbps with some of those final hacks from Vitaliy and Driftwood and company as those journey years came to an end, you'll see a nice improvement. (Some are more stable than others.)

    And the GH1 and GM1 are 4 years apart! Sensors are super important for these results.

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  4. Collapse Details
    I think the 35Mpbs are due to the lack of details, but in this case I totally agree that the sensor is super important.
    Even in the RAW photos there is no detail in the shadows, MFT sensors had evolved a lot since the GH1 :O

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  5. Collapse Details
    I recently bought a GH1 to play around with. Sometimes it's fun to go back to the older bodies and be reminded of what we had available to us a decade ago. It kind of puts into perspective what we have now.

    The GH2 was my main shooter for 2-3 years, but I never owned a GH1 (I was in the 7D crowd back then). It feels like a homecoming of sorts. It was fun to re-live the excitement of hacking the camera (LPowell's Blackout). I could swear that the GH1 grip feels chunkier and better in my hand than the GH2, which was one of my big issues with that camera. No HDMI out is unfortunate and the dynamic range isn't great but I do generally like the image and the color palette though, as far as hybrid mirrorless cameras go. And adding a cheap Viltrox focal reducer makes it a lot more versatile (though the wider sensor does cause some of my APS-C lenses to vignette):

    2 out of 2 members found this post helpful.
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  6. Collapse Details
    Senior Member
    Join Date
    Nov 2020
    Paris, France
    Yeah, nice. Is there some significance to the f/14 in the title?

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  7. Collapse Details
    Quote Originally Posted by Samuel Dilworth View Post
    Yeah, nice. Is there some significance to the f/14 in the title?
    Just noting it in case the images look soft due to diffraction. I only had a 2-stop ND filter with me and it wasn't nearly enough.
    Last edited by QuickHitRecord; 04-20-2021 at 03:52 PM.

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  8. Collapse Details
    Senior Member
    Join Date
    Nov 2020
    Paris, France
    As someone still learning the ropes, I like seeing simple and yet competent videos like this by people who know what they’re doing. Little details like the sped-up speedboat. Portland looks like a pleasant place.

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  9. Collapse Details
    That's very kind but if I really knew what I was doing, I would have had the foresight to bring my whole filter pouch instead of just the one filter! ; )

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  10. Collapse Details
    Some more from the GH1. I am shocked by how much I like the footage from this little camera, even (especially!) in 2021:

    1 out of 1 members found this post helpful.
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