Question 1

What’s the difference between a codec and a container format?

Accepted Answer

A codec (like H.264 or ProRes) compresses and decompresses video data, while a container format (like MP4 or MOV) holds the compressed video along with audio, subtitles, and metadata in one file.

Question 2

Why does bit depth matter in video production?

Accepted Answer

Bit depth (e.g., 8-bit vs. 10-bit) determines how many shades of color and brightness a video can display. Higher bit depth allows smoother color gradients and reduces banding, which is especially important in color grading.

Question 3

Is H.265 better than H.264?

Accepted Answer

H.265 (HEVC) offers better compression than H.264, meaning it can maintain similar quality at smaller file sizes. However, it requires more processing power and isn’t supported on all devices or platforms.

Question 4

What is chroma subsampling and why is it used?

Accepted Answer

Chroma subsampling (e.g., 4:2:0) compresses color data to reduce file size, based on the idea that the human eye notices brightness more than color. It's widely used in streaming and web videos to save bandwidth.

Question 5

When should I use a professional codec like ProRes or DNxHD?

Accepted Answer

Use ProRes or DNxHD/HR in post-production workflows where quality and editing performance matter more than file size. These intra-frame codecs preserve more detail and are easier to edit than highly compressed formats like H.264.

Video terminology

Glossary of Video Format and Codec Terms: Your Essential Reference