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AVC1是h264还是x264编码？音频编码AC3内的0x2000代表什么？如何查看视频的起始码？ - 知乎 H 264=AVC=MPEG-4 Part 10，是一种编码规范 H264、x264、AVC1是基于上述规范的不同编码器 H264付费，但支持硬件加速；x264开源免费，不支持硬件加速 AVC1:bitstream without start codes；H264:bitstream with start codes 但是大家都在混用，尤其是H 264和H264，所以具体含义得结合上下文。