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The size of a 2-hour movie in gigabytes (GB) depends on several factors, including the video resolution, video codec, audio codec, and frame rate. Here's a detailed breakdown of each factor and how it affects the file size:

Video Resolution:

The video resolution refers to the number of pixels that make up the video frame. Higher resolutions, such as 4K (3840 x 2160 pixels) and 8K (7680 x 4320 pixels), require more storage space compared to lower resolutions like 720p (1280 x 720 pixels) and 1080p (1920 x 1080 pixels).

Video Codec:

The video codec is a compression algorithm used to reduce the size of the video file without significantly compromising the visual quality. Common video codecs include H.264 (MPEG-4 AVC), H.265 (HEVC), and VP9. H.264 is widely used and offers a good balance between file size and quality, while H.265 and VP9 provide even better compression, resulting in smaller file sizes.

Audio Codec:

The audio codec is responsible for compressing the audio track of the movie. Common audio codecs include AAC (Advanced Audio Coding), MP3 (MPEG-1 Audio Layer 3), and AC3 (Audio Coding 3). AAC offers high-quality audio with a relatively small file size, while MP3 is a popular format that provides a good compromise between quality and file size. AC3 is commonly used for surround sound audio, which typically has a larger file size.

Frame Rate:

The frame rate refers to the number of frames displayed per second. Higher frame rates, such as 60 frames per second (fps) and 120 fps, result in smoother motion and can enhance the viewing experience. However, they also increase the file size compared to lower frame rates like 24 fps and 30 fps.

Example Calculations:

Based on the above factors, here are some approximate file sizes for a 2-hour movie:

* 4K H.264 AAC 60 fps: Approximately 15-20 GB
* 4K H.265 AAC 30 fps: Approximately 10-15 GB
* 1080p H.264 AAC 30 fps: Approximately 4-8 GB
* 720p H.264 MP3 24 fps: Approximately 2-4 GB

It's important to note that these file sizes are estimates and can vary depending on the specific content of the movie and the encoding settings used.

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