![]() ![]() However, changing frame rates require a close examination of our storage as file sizes increase significantly as frame rates increase. When working with HD media, it is easy to assume that our storage can easily handle different frame rates – and it can, because the amount of data being transferred each second is relatively small at small frame sizes. NOTE: While many high-end productions are now shooting HDR material at bit-depths up to 16-bit, the general relationship of frame rate to storage remains the same, though the specific numbers will vary by frame size and codec. For example, p ProRes 422 requires 132 GB to store per hours while 60 fps 8K ProRes 4444 requires 5,091 GB! Notice that in all three charts, the shape of the curve is the same, only the amount of data being transferred changes. (Storage capacity required to store one hour of 8K media.) (Storage capacity required to store one hour of UHD media.) (Storage capacity required to store one hour of 1080p media.) The next three charts illustrate, based on Apple’s research, the capacity changes for 1080p, UHD, and 8K media as frame rates change. While not a small file, this pales into insignificance when compared to the gigabytes per hour that video requires. NOTE: What about audio? Well, an hour of uncompressed 16-bit audio is 650 MB. Which is at High settings on 1080p performance. 60 fps video requires 2.5X the capacity and bandwidth of 24 fps video. Getting the Graphing Calculator by Mathlab running while using a GeForce RTX 3090 can see it could return a reliable 70 FPS.If we set 24 fps media to 100% capacity and bandwidth, note how increasing the frame rate increases both the capacity required to store the media and the speed of the storage bandwidth to support the increased frame rate. This is the key chart that illustrates the numbers outlined in the Executive Summary. Higher frame rates require bigger and faster storage. Just as capacity increases by these amounts, so, also, does bandwidth. Useful and Common PWM Modes While a variety of period values can be selected, the fol- lowing modes would be most commonly used: 10-bit Mode: In this mode PWM duty cycle has full 10-bit resolution (maximum offered by the PIC17C42). 60 fps video = 250% capacity and bandwidth increase Note however that the duty cycle resolution is a little less than 7-bits.50 fps video = 208% capacity and bandwidth increase.30 fps video = 125% capacity and bandwidth increase.25 fps video = 104% capacity and bandwidth increase.Regardless of frame size, as frame rates increase, storage needs and bandwidth also increase. If we set the storage needs of 24 fps video (regardless of frame size) to 100%, then: Here’s a white paper from Apple with all the source numbers. Other codecs will generate different numbers, but the basic results are the same. NOTE: In this example, I’m using Apple ProRes as a baseline codec. This week, I want to look at the effect increasing video frame rates has on storage capacity and bandwidth. ![]() More generally, though, that article was about how storage bandwidth and capacity increase as frame size increases. Last week, I wrote about the challenges 8K video presents to our storage systems. ![]()
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