本文介绍了使用最新版ffmpeg4.0和x264库进行视频编码的速度测试，探讨了不同配置参数对编码效率的影响。
1, 最新版本的ffmpeg4.0及x264库.
可以直接改preset那个地方
av_opt_set
在x264.h里面有一个枚举
x264_preset_names
改成medium，faster甚至very fast都可以试试
这几个里面subq相差挺大的，最快时候的可能是slow的二倍多
av_opt_set
在x264.h里面有一个枚举
x264_preset_names
改成medium，faster甚至very fast都可以试试
这几个里面subq相差挺大的，最快时候的可能是slow的二倍多
/* x264_param_default_preset:
* The same as x264_param_default, but also use the passed preset and tune
* to modify the default settings.
* (either can be NULL, which implies no preset or no tune, respectively)
*
* Currently available presets are, ordered from fastest to slowest: */
static const char * const x264_preset_names[] = { "ultrafast", "superfast", "veryfast", "faster", "fast", "medium",
* The same as x264_param_default, but also use the passed preset and tune
* to modify the default settings.
* (either can be NULL, which implies no preset or no tune, respectively)
*
* Currently available presets are, ordered from fastest to slowest: */
static const char * const x264_preset_names[] = { "ultrafast", "superfast", "veryfast", "faster", "fast", "medium",
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