最近研究x265编码时如何启用high profile（后来才了解到对x265来说应该是high tier），之前接触x264的时候了解到的是直接在编码指定profile时就会有main和high的profile之分，如main、high、high10、high422等，但到了x265时却发现可指定的profile只有这么几个：
static const char * const x265_profile_names[] = {
/* HEVC v1 */
"main", "main10", "mainstillpicture", /* alias */ "msp",
/* HEVC v2 (Range Extensions) */
"main-intra", "main10-intra",
"main444-8", "main444-intra", "main444-stillpicture",
"main422-10", "main422-10-intra",
"main444-10", "main444-10-intra",
"main12", "main12-intra",
"main422-12", "main422-12-intra",
"main444-12", "main444-12-intra",
"main444-16-intra", "main444-16-stillpicture", /* Not Supported! */
0
};
并没有像x264的各种high，后经研究发现x265的high profile是通过另一个参数：“high-tier”来控制的，于是用ffmpeg命令行作了如下测试：
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