Results 11 to 18 of 18
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Senior Member
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- Jul 2012
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Senior Member
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- Nov 2009
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- Cary, NC
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08-08-2012 05:55 AM
Technically the hack hack benefits 720p more than 24p since 720p is only offered at 17 mb/sec without B frames in stock form and 24p is 24 mb/sec with B frames. The hack takes those parameters to a completely different level but the difference between hacked and unhacked should be greater for 720p vs. the 1080p frame rates.
Panasonic DMC-GH2 movies
http://www.youtube.com/user/mpgxsvcd#play/uploads
http://vimeo.com/user442745
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Senior Member
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- Nov 2006
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- yeovil uk
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08-08-2012 02:18 PM
Ok J.F.R and mpgxsvcd interesting.
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Senior Member
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08-09-2012 05:56 AM
high bit rate(ie: hacked) 1080p @ 60 FPS in the GH3 will render this conversation mute.
Panasonic DMC-GH2 movies
http://www.youtube.com/user/mpgxsvcd#play/uploads
http://vimeo.com/user442745
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Senior Member
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- Jun 2009
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- 345
08-11-2012 08:04 AM
I know that GH2 enthusiasts make some pretty strong claims for the various hacks but this has to be the most ludicrous statement that I have ever heard regarding the GH2. I'll acknowledge that it shoots good video for the price but the best video camera available today? You have got to be kidding!
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Senior Member
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Senior Member
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- Mar 2010
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08-11-2012 12:17 PM
What shortchanges the current generation of DSLR video cameras is the poor performance of their H.264/AVCHD encoders, (in addition to moire artifacts on some models). H.264 was originally engineered as a highly compressed format for commercial distribution of consumer content, such as Blu-ray discs. Professional Blu-ray encoders use multiple encoding passes with elaborate motion tracking algorithms to achieve excellent quality at relatively low bitrates. Even so, Blu-ray images are far too compressed for post-production grading or magnified theater projection.
The H.264 encoders in DSLR's have a much more demanding task: real-time capture of HD video with tightly constrained processing and memory resources. In these circumstances, standard H.264 encoding works quite well for consumer-grade videos displayed directly on HDTV's. Where its shortcomings appear is when shooting highly detailed scenes with complex motion, intended as source footage for post-production grading. The results are not simply blurred or lacking in detail, they are often contaminated with jagged digitized artifacts that are difficult to remove.
While the AVCHD encoder in the GH2 is no better than the rest, it is implemented entirely in software. That's made it the most hackable encoder of its generation, along with the camera's ability to reliably handle bitrates of over 100Mbps. This makes it possible to capture panning and rapid movements with excellent motion picture quality (by recording a much higher number of independent key frames per second).
The encoder optimization techniques we use to hack the GH2 are quite different from the industry guidelines used in standard H.264 encoders. Rather than sacrifice image quality for the sake of compression efficiency, our aim is exactly the opposite. Mainstream DSLR manufacturers are focused on marketing products for a broad range of customers, and my impression is that image quality is not their highest priority. As with the auto industry, performance optimization is a field more suited to after-market specialists.






