Every time you press the record button, your camera does a small miracle: it turns a stream of full-resolution images into a compact file you can actually store and share. The technology that decides how aggressively to squeeze that footage — and how much quality survives — is the video codec. Your camera probably gives you a list of them (H.264, H.265, ProRes, and sometimes RAW), and the choice affects file size, editing speed, and how much detail you can pull back in post. Here’s what each one is, how it works, and when to reach for it.

What Is a Video Codec, Exactly?

The word codec is a portmanteau of compressor / decompressor. It is the algorithm that shrinks video for storage and rebuilds it for playback. A single uncompressed frame is enormous — a 4K frame holds over eight million pixels across three color channels — and at 24, 30, or 60 frames per second the raw numbers quickly become unmanageable. A codec removes redundant information that the human eye is unlikely to notice, trading some computation for dramatically smaller files. The two questions that define any codec are how much it compresses, and what it throws away.

Delivery Codecs: H.264 (AVC) and H.265 (HEVC)

If you have shared a video online in the last two decades, it was almost certainly compressed with H.264, formally Advanced Video Coding (AVC). It remains the most universally compatible format on the planet: every phone, browser, and streaming platform can play it. Its successor, H.265 (High Efficiency Video Coding, or HEVC), delivers roughly the same visual quality at about half the bitrate — a real saving when you are pushing 4K and 8K footage — but costs more processing power to encode and decode.

Both are typically inter-frame (or Long-GOP) codecs. Instead of storing every frame in full, they save one complete “keyframe” (an I-frame) and then record only the differences from frame to frame (P-frames and B-frames) until the next keyframe arrives. This is why they compress so efficiently — a static interview shot barely changes between frames — but it also makes them harder to edit, because the editor must reconstruct an entire group of pictures just to show a single frame.

Editing Codecs: Apple ProRes

Professional workflows usually record or transcode to an intra-frame codec such as Apple ProRes. In an intra-frame codec, every single frame is encoded independently, with no reliance on its neighbors. That means larger files, but instant, frame-accurate scrubbing and much smoother editing on ordinary hardware. ProRes is also designed to be visually lossless through many generations of re-encoding, so a clip can be exported, graded, and re-exported without visibly degrading.

ProRes comes in a family of flavors with different data rates. At 1080p and 29.97 fps, ProRes 422 targets about 147 Mbps, while ProRes 422 HQ targets about 220 Mbps — roughly two-thirds the data rate of the HQ version for nearly the same quality. Both are 10-bit, 4:2:2 formats that preserve enough color information for serious color grading.

RAW Video: Maximum Latitude, Maximum Files

At the top of the quality ladder sits RAW video. Rather than baking a processed, compressed image into the file, a RAW codec stores the sensor’s original data with minimal processing. Formats such as ProRes RAW, Blackmagic RAW, and Canon Cinema RAW Light let you change white balance, ISO, and exposure after the fact with far more latitude than a compressed file allows. The trade-off is size: RAW footage is dramatically larger than even ProRes, and it demands fast storage and a powerful computer. It is the domain of narrative, commercial, and high-end work where the flexibility is worth the overhead.

Long-GOP vs All-Intra: The Choice That Matters

The practical decision most shooters face is between a Long-GOP codec (small files, harder to edit) and an All-Intra codec (big files, effortless editing). H.264 and H.265 are available in both modes on many modern cameras; “All-Intra H.264” behaves more like ProRes while still being broadly compatible. A useful rule of thumb: if you are shooting long events or vlogs where storage is the constraint, Long-GOP is your friend. If you are shooting footage destined for heavy grading and frame-by-frame work, reach for All-Intra or ProRes.

Choosing the Right Codec

There is no single “best” codec — only the right one for the job. For quick delivery to the web, H.264 is the safe, compatible default. For 4K or higher where bandwidth and storage matter, H.265 (or the newer, royalty-free AV1, now spreading across streaming) cuts file sizes roughly in half. For editing and grading, ProRes is the industry workhorse. For maximum post-production flexibility, RAW video wins — if your storage can take it. Many creators land on a simple two-stage workflow: record in a high-quality codec, then export a compressed H.264 or H.265 master for distribution.

Conclusion

A codec is the invisible contract between your camera, your storage, and your editing software. Understanding the difference between efficient-but-fragile Long-GOP formats, robust-but-large intra-frame codecs like ProRes, and flexible-but-huge RAW video is what separates footage that edits smoothly from a drive full of files you cannot easily work with. Next time you dive into your camera’s movie menu, you will know exactly what those three-letter options are really trading away.

FAQ

What is the difference between H.264 and H.265?

H.265 (HEVC) offers roughly the same visual quality as H.264 (AVC) at about half the bitrate, so it produces smaller files or better quality at the same size. It requires more processing power and slightly less universal compatibility.

Why do professionals edit in ProRes instead of H.264?

ProRes is an intra-frame codec: every frame is stored independently, so editors can scrub frame-by-frame instantly, and it survives many re-encodes without visible quality loss. Long-GOP H.264 is smaller but much heavier to edit.

What is the difference between ProRes and ProRes RAW?

ProRes stores a processed (though lightly compressed) 10-bit image, while ProRes RAW preserves the sensor’s original data so white balance and exposure can be changed dramatically after shooting. RAW files are far larger.

Is RAW video worth it?

Only if you need maximum flexibility in grading or are shooting high-budget work. For most everyday and event video, a good compressed or ProRes codec is far more practical and still looks excellent.