50Mbps AVCHD Fast Action 3-Frame GOP Patch
- Thread starter Lpowell
- Start date
rambooc1
Well-known member
I've never found cineform Neoscene to be a good deinterlacer for 50i, they promised to fix this in later versions, but still the blending method they use leaves my moderate motion footage ghosty. I much prefer Sony Vegas Pro interpolate deinterlace on cineform 50i imported footage even if it takes a small resolution hit.
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3m 49s limit on the 60Mbps MPEG(LPowell "I" setting")
3m 49s limit on the 60Mbps MPEG(LPowell "I" setting")
I install the "I" patch and it work great! except when I use the 60Mbps Mpeg, the video recording is limit to 3m49s, and i'm using 32gb memory stick.
Am I missing something, the remove 30 limit box is checked.
Thanks
3m 49s limit on the 60Mbps MPEG(LPowell "I" setting")
I install the "I" patch and it work great! except when I use the 60Mbps Mpeg, the video recording is limit to 3m49s, and i'm using 32gb memory stick.
Am I missing something, the remove 30 limit box is checked.
Thanks
Check out the link in my signature for detailed instructions on installing my Fast Action 3-Frame GOP Patch. After you've downloaded PTool, the Panasonic firmware, and an INI patch file to the same folder, you need to load the Panasonic firmware and press one of PTool's A-J buttons to update it with the INI file's patches.
bronxjragon
Well-known member
Is it possible to combine this Patch with also your 40Mbps AVCHD High Reliability? http://www.dvxuser.com/V6/showthread.php?219132-40Mbps-AVCHD-High-Reliability-Patch
It would be great to use these settings for 720p/60 so I can capture high quality images for slow mo later, and also have the high bit rate settings in your 40mbps high reliability patch when I want to film in my usual 1080p/24 preferred format! Thanks!
It would be great to use these settings for 720p/60 so I can capture high quality images for slow mo later, and also have the high bit rate settings in your 40mbps high reliability patch when I want to film in my usual 1080p/24 preferred format! Thanks!
just had a greenscreen shoot yesterday and used the 60mbps 422 Mjpeg option of this patch with a Transcend Class 10 16Gb card and got write errors at the beginning of several takes. this was a very well-lit scene with very little detail (no grass, no water ripples, etc). fortunately the errors came up immediately, at the beginning of a shot, and not in the middle or at the end!
i'm not sure, but i think i was able to avoid further 'write errors' by turning AF off. at the time it seemed to me that the camera couldn't handle auto-focusing while writing 60mbps to the card.
i'm not sure, but i think i was able to avoid further 'write errors' by turning AF off. at the time it seemed to me that the camera couldn't handle auto-focusing while writing 60mbps to the card.
I've seen this happen with auto-focus lenses on rare occasions as well. If recording starts before focus-lock has been achieved, you'll actually see the image come into focus in the initial frames of the video. If the camera is already straining to handle a high bitrate, this could be enough to provoke an internal write error. To preclude this pitfall with auto-focus lenses, I first get a focus-lock in AFS mode with a half-press of the shutter button, and then switch to manual focus mode before taking the shot.
alignment1
Well-known member
Great to know! thanks lpowell!
I'm a little confused. I thought the point of a "fast action" patch was to film fast action stuff. Like Skiing for example. But I see you've limited the 720 in avhcd mode to only 30p.
Wouldn't 60p be a better choice for fast action. It's likely I'm not tech intelligent enough to understand what you have done off the bat, but I always held the idea that 60p was simply better in capture much movement activities.
Yes, 60p has inherent advantages in capturing rapid movement with twice as many frames as 30p. If the GH1 had a 100Mbps Intra-frame encoder that recorded at 60fps, it would be the preferred choice for fast action videos.
Unfortunately, the 60p AVCHD encoder has technical limitations that can degrade its image quality on rapidly moving objects. In order to handle a 60p video stream with practical efficiency, it records only about two key frames (I-frames) per second. For the rest of the frames it encodes only the pixels that have changed from previous frames (P-frames). When there's a lot of fast motion in a scene, the P-frames can require so much data to encode that there may not be enough bitrate left to encode the I-frames in high quality. In extreme cases, there will be visibly degraded regions where the motion looks muddy.
The direct way to improve image quality is to increase the encoder's available bitrate, but with the GH1, there are reliability issues that impose limitations on this approach. An alternate approach for handling fast motion is to increase the number of I-frames in the video. This restricts the amount of motion that can occur between key frames, which can significantly reduce the bitrate required to encode the P-frames.
What I discovered working on this patch is that if I reduced the AVCHD frame rate from 60p to 30p, I could dramatically shorten the GOP to just three frames, producing ten key frames per second. At such a quick rate, there's very little motion between key frames, and the P-frames can be efficiently encoded at relatively low bitrates. That gives you image quality close to what you'd get with an Intra-frame encoder at twice the bitrate.
The shortest GOP I've been able to make work reliably at 60p is 12 frames, which produces five key frames per second. Check out the link in my signature for more details.
UPDATED to Version 2! PTool 3.56d INI files ready for download
As you may have heard, the latest version of PTool 3.56d liberates all previously unhackable versions of not only the GH1, but the GF1 and G2 cameras as well. In addition, it provides a variety of new patches that I've been able to incorporate into the Fast Action 3-Frame GOP Patch, making it more versatile than ever.
The Fast Action 3-Frame GOP Patch is ideally suited for the GF1 and G2 cameras' hardware capabilities. The NTSC version of these cameras produces native 720p30 video streams in both AVCHD SH mode and in MJPEG HD mode. This patch boosts the peak bitrate of both video modes to over 50Mbps and in SH mode uses a remarkably short 3-frame GOP-size, recording 10 key frames per second. (This 3-frame GOP is used in PAL AVCHD SH mode as well, recording at 720p25.) Using such a high density of key frames enables the Fast Action 3-Frame GOP Patch to maintain excellent image quality while tracking rapid moving objects.
In addition, all GF1 and G2 cameras may now be freely switched between NTSC and PAL video modes, and all available user interface languages. This patch also enables Manual-exposure video modes, third party batteries, and eliminates 30-minute recording limits in AVCHD modes.
Fast Action 3-Frame GOP Patch v2
As you may have heard, the latest version of PTool 3.56d liberates all previously unhackable versions of not only the GH1, but the GF1 and G2 cameras as well. In addition, it provides a variety of new patches that I've been able to incorporate into the Fast Action 3-Frame GOP Patch, making it more versatile than ever.
The Fast Action 3-Frame GOP Patch is ideally suited for the GF1 and G2 cameras' hardware capabilities. The NTSC version of these cameras produces native 720p30 video streams in both AVCHD SH mode and in MJPEG HD mode. This patch boosts the peak bitrate of both video modes to over 50Mbps and in SH mode uses a remarkably short 3-frame GOP-size, recording 10 key frames per second. (This 3-frame GOP is used in PAL AVCHD SH mode as well, recording at 720p25.) Using such a high density of key frames enables the Fast Action 3-Frame GOP Patch to maintain excellent image quality while tracking rapid moving objects.
In addition, all GF1 and G2 cameras may now be freely switched between NTSC and PAL video modes, and all available user interface languages. This patch also enables Manual-exposure video modes, third party batteries, and eliminates 30-minute recording limits in AVCHD modes.
Fast Action 3-Frame GOP Patch v2
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Fool4UAnyway
Active member
Is this patch (still) available for the GH1 as well?
Is this patch (still) available for the GH1 as well?
Is this FA GOP3 v2 patch also functioning for the GH1?
Or is the previous version for that camera still available?
Or will there be a new one?
Is this patch (still) available for the GH1 as well?
Is this FA GOP3 v2 patch also functioning for the GH1?
Or is the previous version for that camera still available?
Or will there be a new one?
The Fast Action 3-Frame GOP Patch v2 is still compatible with the GH1 and the AVCHD modes work exactly the same as the original version of the patch. Version 2 works on both hackable and previously unhackable cameras and provides new options for MJPEG mode on all GF1, G2, and GH1 cameras.
The 1080p modes in the Fast Action 3-Frame GOP Patch v2 work only on the GH1 and produce interlaced 24/25p NTSC/PAL videos with a maximum bitrate of 55Mbps. The performance of this 1080p video mode is comparable to that of the Blackout-Powell Native 24p Patch, but it is only able to produce videos in non-native interlaced format.
Fool4UAnyway
Active member
Yes, I wanted to keep the help balloon simple, so I didn't mention the GH1. However, the patch still works fine with the GH1, though it's not the best choice any more since it doesn't support Native 24/25p recording.
Is this the best patch for green screen work?
Is this the best patch for green screen work?
Hello, I am working on a hobby project involving green/blue screen. I own a GF1 with the 20mm fixed lense, and I also own a bunch of konica hexanons that I use with an adapter. I have been having problems with pulling keys with the footage, I just cannot get good chroma separation, in particular tough situations with semi transparent objects and long hair. A friend gave me a hint to these hacked firmware thingys, but I downloaded PTool, and I am quite confused on which patches I should install. Then I stumbled onto this one. Will the 100mbit AVCHD give me enough chroma and sort out the edging artifacts so that I may pull a good key? Or should I find a way to get the MJPEG codec up to par by increasing it's bitrate and checking the 4:2:2 option? But it says 30p and I have a PAL camera, so that part also confuses me a bit. I would like to work in 25p, but the footage off the camera lists as 25p, but after effects claims it is 50i when I try to use the rotobrush...
Anyways... is this the hack to get? Or is there another better option?
Drcircuit.
Is this the best patch for green screen work?
Hello, I am working on a hobby project involving green/blue screen. I own a GF1 with the 20mm fixed lense, and I also own a bunch of konica hexanons that I use with an adapter. I have been having problems with pulling keys with the footage, I just cannot get good chroma separation, in particular tough situations with semi transparent objects and long hair. A friend gave me a hint to these hacked firmware thingys, but I downloaded PTool, and I am quite confused on which patches I should install. Then I stumbled onto this one. Will the 100mbit AVCHD give me enough chroma and sort out the edging artifacts so that I may pull a good key? Or should I find a way to get the MJPEG codec up to par by increasing it's bitrate and checking the 4:2:2 option? But it says 30p and I have a PAL camera, so that part also confuses me a bit. I would like to work in 25p, but the footage off the camera lists as 25p, but after effects claims it is 50i when I try to use the rotobrush...
Anyways... is this the hack to get? Or is there another better option?
Drcircuit.
I optimized the Fast Action 3-Frame GOP Patch specifically for the GF1 and it sounds like this will be the best choice for your needs. As detailed in the first post of this thread, the MJPEG HD mode in this patch will record at a high bitrate in 4:2:2 color depth, providing the highest chroma resolution for color keying that the camera can produce. However, MJPEG always works at 30p, regardless of whether it is in PAL or NTSC mode.
Thank you very much for your reply.
Just another quick question. Will these video modes overwrite those that are currently on the camera? Or will they surface in addition to those there allready?
Is there anything I need to know or have to do if I want to revert back to factory firmware? (For instance for warranty repairs and such..)
Drcircuit.
Just another quick question. Will these video modes overwrite those that are currently on the camera? Or will they surface in addition to those there allready?
Is there anything I need to know or have to do if I want to revert back to factory firmware? (For instance for warranty repairs and such..)
Drcircuit.