Hi there! I'm a video editor with over a decade of experience in the field. I've worked on everything from short social media content to feature-length films, and I'm well-versed in all aspects of video production, including the technical side of things like file sizes and compression.

You're asking a great question: "How many GB is a 4K video?" The answer, like with many things in video, is: it depends. There's no one-size-fits-all answer because several factors influence a 4K video's file size. Let's break those down:

* Resolution: You've already nailed down one crucial factor: 4K resolution. This generally refers to a resolution of 3840 x 2160 pixels, which packs in four times the pixels of standard HD (1920 x 1080). More pixels mean more data, hence larger file sizes.

* Codec: This is the method used to compress the video file. Different codecs have different compression efficiencies and levels of quality loss.
* H.264 is widely used and offers a good balance between compression and quality.
* H.265 (HEVC) is newer and provides even better compression, resulting in smaller files for the same quality level.
* ProRes and DNxHD are high-quality codecs often used in professional settings, but they result in significantly larger files.

* Bitrate: Measured in megabits per second (Mbps), bitrate dictates how much data is used per second of video. Higher bitrates mean better quality and larger files. 4K video bitrates can range widely:
* Low: 10-25 Mbps (suitable for web streaming)
* Medium: 25-50 Mbps (good for general viewing)
* High: 50-100 Mbps (ideal for professional editing and archiving)
* Very High: 100+ Mbps (used for high-end productions and RAW footage)

* Frame Rate: This refers to how many individual frames are displayed per second (fps). Higher frame rates result in smoother motion but increase the data required.
* 24fps: Standard for cinematic content.
* 30fps: Common for television and online video.
* 60fps: Ideal for fast-paced action and smoother slow-motion.

* Color Depth & Chroma Subsampling: These factors influence the accuracy and detail of the color information within the video, impacting the file size.

* Duration: This one's simple: a longer video means more data to store, resulting in a larger file size.

To give you some rough estimates:

* **A 1-minute 4K video at 24fps, using H.264 codec with a moderate bitrate of 25 Mbps, could occupy approximately 375MB.**
* **That same video at a high bitrate of 50 Mbps could take up around 750MB.**
* **A 1-hour 4K movie at a high bitrate could easily reach 25GB or more.**

Remember: These are just estimates. To calculate the file size of your specific 4K video, you can use online video file size calculators. These tools typically require you to input the factors mentioned above to provide a more accurate estimate.

Let me know if you have any other questions!

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