Why it matters

For maximum compatibility, H.264 is still the answer. Understanding features helps encoder tuning.

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The architecture

Profiles: baseline (basic), main (typical), high (best quality). Different feature sets.

Levels: max bitrate, resolution, framerate.

H.264 config spaceProfilesbaseline / main / highLevelsconstraint ceilingEncodersx264 dominantx264 is dominant open encoder; hardware encoders vary in quality
H.264 configuration.
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How it works end to end

x264: dominant open-source encoder. Excellent quality, widely used.

Hardware encoders: nvenc (NVIDIA), quicksync (Intel), VideoToolbox (Apple). Fast but lower quality than x264 at same bitrate.

Streaming: HLS and DASH both support H.264 natively.

License: MPEG-LA patent pool. Fees for content distribution.