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ARMv7 optionally with NEON, AArch64 optionally with NEON.

Intel x86 optionally with MMX/SSE (no AVX yet, help is welcome).

Multiple reference frames when specified in Sequence Parameter Set (SPS).

Dynamic changes to bit rate, frame rate, and resolution.

Periodic and on-demand Instantaneous Decoder Refresh (IDR) frame insertion.

Multiple reference frames when using LTR and/or 3-4 temporal layers.

Single reference frame for inter prediction.

Memory Management Control Operation (MMCO).

Spatial simulcast up to 4 resolutions from a single input.

Simulcast AVC up to 4 resolutions from a single input.

Temporal scalability up to 4 layers in a dyadic hierarchy.

Multiple threads automatically used for multiple slices.

Slice options: 1 slice per frame, N slices per frame, N macroblocks per slice, or N bytes per slice.

Rate control with adaptive quantization, or constant quantization.Arbitrary resolution, not constrained to multiples of 16x16.Constrained Baseline Profile up to Level 5.2 (Max frame size is 36864 macro-blocks).It is suitable for use in real time applications such as WebRTC. OpenH264 is a codec library which supports H.264 encoding and decoding.