Codecs & bit depth
XAVC HS, S, and S-I in plain language, what 10-bit 4:2:2 buys you, and what a learner actually needs.
- Tell the a6700's video codecs apart and know when each fits
- Explain what bit depth and chroma subsampling mean for editing
- Pick a sensible default and know when to deviate
Once the frame rate and shutter are set, the camera has to write the file, and Sony offers several ways to do it. The names look cryptic; the ideas behind them are not.
The three codecs
- XAVC S — the efficient, friendly default. Long-GOP compression keeps files reasonable and edits smoothly on most computers. This is where you start.
- XAVC HS — a newer, more efficient codec (HEVC/H.265) that packs more quality into the same space, at the cost of needing more computer power to edit.
- XAVC S-I — “I” for intra-frame: every frame is stored whole. Superb quality and the easiest to edit frame-by-frame, but the files are large.
For almost everything you will shoot while learning, XAVC S is the right answer. Step up to S-I only when a project genuinely needs the extra robustness.
Bit depth: 8-bit versus 10-bit
Bit depth is how finely tones are recorded. 8-bit holds 256 levels per channel; 10-bit holds 1024. You rarely see the difference straight out of camera, but you feel it the moment you grade: 10-bit resists banding in skies and gradients and gives color correction far more room. The a6700 shoots 10-bit, and you should use it.
Chroma: 4:2:0 versus 4:2:2
Chroma subsampling describes how much color detail is kept relative to brightness. 4:2:0 keeps less; 4:2:2 keeps more. The extra color of 4:2:2 helps with grading, green-screen keying, and clean color edges. On this body, 10-bit 4:2:2 is available and worth it.
The learner’s default
Put it together and the recommendation is simple:
- XAVC S, 10-bit 4:2:2, at 4K24.
That gives you clean, gradable footage at file sizes a normal computer and card can handle. Deviate only with a reason: XAVC S-I for a demanding edit, HS when storage is tight and your computer is strong, 8-bit essentially never on this camera.
In the field
Record one clip with a bright window and a smooth wall gradient. Grade it hard — push the color and contrast. The 10-bit 4:2:2 file holds together where an 8-bit clip would band and smear. That resilience is what the acronyms were protecting.