ffplay安装

ffplay播放H264视频帧，需要终端安装ffplay，但是brew install ffmpeg --with-ffplay会提示安装失败，改成-sdl2就可以了。

使用时，

汇总：

1. brew reinstall ffmpeg \
2. -- with-chromaprint \
3. -- with-fdk-aac \
4. -- with-libass \
5. -- with-librsvg \
6. -- with-libsoxr \
7. -- with-libssh \
8. -- with-libbluray \
9. -- with-libbs2b \
10. -- with-libcaca \
11. -- with-libgsm \
12. -- with-libmodplug \
13. -- with-libvidstab \
14. -- with-opencore-amr \
15. -- with-openh264 \
16. -- with-openjpeg \
17. -- with-openssl \
18. -- with-tesseract \
19. -- with-rtmpdump \
20. -- with-rubberband \
21. -- with-sdl2 \
22. -- with-snappy \
23. -- with-tools \
24. -- with-webp \
25. -- with-x265 \
26. -- with-xz \
27. -- with-zeromq \
28. -- with-zimg \
29. -- with-frei0r \
30. -- with-game-music-emu