OpenH264 介绍
OpenH264 是思科公司发布的一个开源的 H.264 编码和解码器。
编码器特性
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Constrained Baseline Profile up to Level 5.2 (4096x2304)
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Arbitrary resolution, not constrained to multiples of 16x16
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Rate control with adaptive quantization, or constant quantization
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Slice options: 1 slice per frame, N slices per frame, N macroblocks per slice, or N bytes per slice
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Multiple threads automatically used for multiple slices
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Temporal scalability up to 4 layers in a dyadic hierarchy
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Spatial simulcast up to 4 resolutions from a single input
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Long Term Reference (LTR) frames
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Memory Management Control Operation (MMCO)
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Reference picture list modification
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Single reference frame for inter prediction
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Multiple reference frames when using LTR and/or 3-4 temporal layers
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Periodic and on-demand Instantaneous Decoder Refresh (IDR) frame insertion
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Dynamic changes to bit rate, frame rate, and resolution
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Annex B byte stream output
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YUV 4:2:0 planar input
解码器特性
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Constrained Baseline Profile up to Level 5.2 (4096x2304)
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Arbitrary resolution, not constrained to multiples of 16x16
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Single thread for all slices
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Long Term Reference (LTR) frames
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Memory Management Control Operation (MMCO)
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Reference picture list modification
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Multiple reference frames when specified in Sequence Parameter Set (SPS)
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Annex B byte stream input
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YUV 4:2:0 planar output
支持的操作系统
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Windows 64-bit and 32-bit (initial release is only 32-bit, 64-bit will follow soon)
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Mac OS X 64-bit (initial release does not include this target, will follow soon)
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Linux 64-bit and 32-bit (initial release is only 32-bit, 64-bit will follow soon)
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Android 32-bit (initial release does not include this target, will follow soon)
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iOS 64-bit and 32-bit (not supported yet, may be added in the future)
支持的处理器
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Intel x86 optionally with MMX/SSE (no AVX yet, help is welcome)
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ARMv7 optionally with NEON (initial release does not include this target, will follow later)
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Any architecture using C/C++ fallback functions
OpenH264 官网
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