This can be seen in the noticeably coarser macroblock artifacts in the 24p B-frame image recorded at the stock 24Mbps bitrate. They will typically encode highly compressed B-frames at lower image quality than the I and P-frames. This can produce not only smeared image details, but undesireable macroblock artifacts as well, which can be seen in the sporadic rectangular edges in detailed areas of the decoded frame grabs.Ĭonsumer-grade H.264 encoders are optimized to maximize data compression rather than image quality. With extremely detailed moving images, however, the encoder's image quality may deteriorate when it reaches the limits of its maximum bitrate. After the H.264 decoder reconstructs the encoded pixel data, it uses a built-in Deblocking Filter to blend the rectangular edges of the adjacent macroblocks together. Sophisticated compression techniques are used to compress the encoded data within each macroblock, reusing image data from adjacent macroblocks and video frames. H.264 encoders divide each video frame into horizontal and vertical rows of tiles called macroblocks. P-frame Comparison 1080p30 (IP 15-frame GOP): I-frame Comparison 1080p30 (IP 15-frame GOP): P-frame Comparison 1080p24 (IBP 12-frame GOP):ī-frame Comparison 1080p24 (IBP 12-frame GOP): I-frame Comparison 1080p24 (IPB 12-frame GOP):
I then displayed and cropped them at 200% magnification in side-by-side 24Mbps versus 54Mpbs comparison shots, and saved screenshots of each comparison. After loading the video files into a 32-bit Adobe After Effects project, I selected I, P, and B-frames from the second GOP in each video sample. In 1080p30 mode, the D5100 records in an IP format using a 15-frame GOP. In 1080p24 mode, the D5100 records in H.264 IPB format using 12-frame GOP. This type of subject presents a myriad of high-contrast moving images that tax the motion tracking and bitrate allocation algorithms of the camera's H.264 video encoder. I selected a sunlit scene of a running stream of water with highlights on the water ripples. The camera was locked down on a tripod and used the Neutral Picture Profile.
#NIKON D3300 FIRMWARE HACK ISO#
I took these shots with a Tamron 24-70mm f2.8 lens set at 70mm, f5.6, and ISO 100. I recently shot comparison tests of the D5100 in 1080pp30 video modes, using the stock 24Mbps bitrate, and hacked 36Mbps and 54Mbps bitrates.
#NIKON D3300 FIRMWARE HACK MOVIE#
Nikon choose to optimize image quality and built quality for an serious DSLR users, Flip camera's are film camera's optimized for people who want a small video camera that has high movie specs on paper.D5100 macroblock artifact comparison:stock 24Mbps versus hacked 54Mbps You are comparing 2 completely different products.
For each camera choices are made regarding quality of components, functionality etc. I would be suprised if a 150 dollar Flip camera was capable of capturing 60fps, but the d7k was physically incapable, however being fairly new to the video world I suppose there are plenty of things that would come as a shock.
(Whether it 'should' be possible is another discussion ))
Just saying that the 60fps would be possible with other firmware just based on pricing makes no sense at all. Unfurtunately, the is only 1 other camera with the same sensor, and there is no reason to assume that Nikon also "crippled" the D5100. If there were a camera with the same sensor that does do 60fps then one could think that such capabilities are "locked" on the D7K (not looking at the other hardware components). Here the sensor is most probably the limiting part. I am no sensor/camera engineer, but I can only assume that such capabilities are a combination of the (physical) sensor, the (physical) electrical components and the software. It appears to many that it's a feature they are holding to release in bodies with a higher price point.ĭon't get me wrong, I also would like my D7000 to do 60fps, but your reasoning is far from logical. What makes me think the d7k would be capable is the fact that most other cameras at this point are capable of capturing 60p. So the first questions are:ġ) Which processors(s) are used (the D70 had two different CPUs).Ģ) Which OS is used as a base? D70 as well as D300 use "6Softune REALOS/FR is Realtime OS for FR Family, based on micro-ITRON COPYRIGHT(C) FUJITSU LIMITED 1994-1999" so we can assume that the D7000 uses the same.ģ) Does anyone have firmware files for the D7000 already? Things will be easier to find out when we have a firmware image.Īnyone ready to open and disassemble his/her new D7000, yet (apart from a crazy guy who paints it pink) to find out about the hardware? The most detailed information I could find about any Nikon firmware hack is for a D70 (partly English/German):īut for the D7000 we probably have to start from the beginning again. It seems like a firmware hack is far away.
0 kommentar(er)
