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How DVCPRO HD Variable Frame Rate Recording Works

In 720p DVCPRO HD variable frame rate recording, the camera CCD outputs a frame rate while the recording rate is fixed at either 59.94 fps or 50 fps (depending on the camcorder model).

A 720p60 camera CCD can generate between 4 and 60 images per second, while the recording unit records at a constant rate of 60 fps (technically, 59.94 fps). When you select any frame rate lower than 60 fps, some images from the CCD are recorded more than once. These redundant frames are tagged for later removal using a special device called a frame rate converter.

What Is a Frame Rate Converter?

A frame rate converter, or FRC, is hardware or software that converts the frame rate of your footage by:

åSetting the rate of playback higher or lower, so that each frame lasts a longer or shorter amount of time on the screen. By changing the duration that each frame is shown onscreen compared to its recorded duration, you can speed up or slow down the action in your media.

åIntelligently skipping redundant frames containing variable frame rate flags

Some frame rate converters can also do upconverting and downconverting, allowing you to use 720p for variable speed cinematography and then transfer to 1080i or 480i (standard definition).

How a Frame Rate Converter Works

On tape, variable frame rate video footage may look a bit strange—almost stroboscopic— because many frames are repeated with the intention that they will be removed. Once the frame rate converter removes the duplicate frames and only unique frames remain, your footage plays back at the intended rate.

For example, if the camera is set to record 15 fps, three out of every four frames are tagged as duplicates and the frame rate converter ignores or discards them. The frame rate converter then converts the 15 fps footage to a new media file at a standard frame rate such as 23.98, 29.97, or 59.94 fps.

Chapter 2 Working with DVCPRO HD

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Apple 6 manual How Dvcpro HD Variable Frame Rate Recording Works, What Is a Frame Rate Converter?
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6 specifications

The Apple iPhone 6, released in September 2014, marked a significant evolution in Apple's smartphone lineup. This model introduced a larger screen and a sleeker design, setting the stage for future devices in the iPhone series.

One of the most notable features of the iPhone 6 was its display. With a 4.7-inch Retina HD screen, the iPhone 6 offered a resolution of 1334 x 750 pixels, delivering vibrant colors and sharp images. This screen size was a departure from previous models, appealing to users who favored larger displays for better viewing experiences, whether for gaming, watching videos, or browsing the web.

The design of the iPhone 6 was another highlight. It featured a slim, curved aluminum body that not only made it more aesthetically pleasing but also improved its ergonomics. Weighing just 129 grams, the phone was light yet robust. The placement of volume buttons, the power button, and the headphone jack was thoughtfully designed to enhance usability.

Under the hood, the iPhone 6 was powered by the A8 chip, a 64-bit dual-core processor that offered impressive performance and energy efficiency. Coupled with the M8 motion coprocessor, the device could effectively handle demanding apps and services while optimizing battery life, providing users with a smooth experience throughout the day.

The camera capabilities of the iPhone 6 were also advanced for its time. It featured an 8-megapixel rear camera with optical image stabilization and a f/2.2 aperture, allowing for clearer low-light photography. The front-facing camera was improved as well, offering a 1.2-megapixel resolution and support for 720p HD video, making it great for selfies and video calls.

Connectivity options included LTE support, enabling faster download speeds, and Wi-Fi calling, which allowed users to make calls over Wi-Fi networks, enhancing communication in areas with poor cellular coverage. The iPhone 6 also introduced the Apple Pay feature, allowing users to make secure transactions using their devices.

In terms of software, the iPhone 6 originally came with iOS 8, which boasted new features such as HealthKit and HomeKit, further integrating technology into daily life. Regular software updates ensured that users could enjoy the latest features and security enhancements well into the device's lifecycle.

Overall, the iPhone 6 distinguished itself with a combination of innovative design, powerful performance, and a user-friendly experience, solidifying Apple's position in the smartphone market and paving the way for future iterations in the iPhone lineup.
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