Gh1 Hack and Final Cut Pro 7

G

gohanmj

New member
I am starting this thread because I have done a lot of research on the GH1 hack but I cannot find any information on what should be a common real-world problem with the hack. Here is the problem and all relevant information:


1. I have hacked my previously unhackable GH17 with all of the popular patches and a couple of my own modified patches using ptool 362.


2. Of all patches I have tried, lpowell's max latitude 100mbps patch seems to have the highest average bit rate according to Media Info.


3. Media Info says the max latitude patch has a max overall bit rate of 108 Mbps and averages 20.8 Mbps


4. Media Info says that footage from my unhacked GH17 has a max overall bit rate of 18 Mbps and averages 11.8 Mbps


5. Once my footage is transferred into Final Cut Pro 7 using Pro Res 422, the data rate in FCP7 of my unhacked footage averages 17 MBps while the data rate of my hacked footage averages about 13.5 MBps.


6. This discrepancy makes no sense to me. And moreover it would seem that if you edit in FCP7 that you are better off not hacking the GH1. Is this assumption correct? Can someone share more information on this issue?
 
Can you see visual differences in the lower bitrate footage of the hacked footage?

Try applying some extreme curves to check out if info is being discarded or getting muddied/lost in the extreme shadows and highlights.

Just an idea for some investigation.
 
Could this be a case of bits and bytes? The way you have it written, which I believe is the way FCP 7 reports, you're talking initially about 108 Mbps, and FCP is reporting 17 MBps. 17 MBps = 136 Mbps. Does that make sense? When B is capitalized, it refers to bytes, when it is lowercase, it refers to bits. Hence, Firewire 800 can handle 800 Mbps, but you'd never see any firewire connection handle 100 MBps, or even close to it because of overhead.
 
You've got to understand that when transcoding to ProRes the original AVCHD bitrates mean nothing, only the actual improvement of the image quality they yield matters. ProRes is a very different codec in how it works and it's likely that the difference in the resulting bitrates is due to a significantly less amount of encoding artifacts/errors in the hacked footage.
 
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