tonydeng / Fmj
FMJ (FFMpeg for Java)。通过Java调用FFMpeg命令的方式来对音视频进行处理（获取信息、截图等等）。
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项目介绍
FMJ (FFMpeg for Java)
通过Java调用FFMpeg命令的方式来对音视频进行处理（获取信息、截图等等）。
FFMpeg安装
建议使用 ffmpeg-2.6.1 版本
Linux
yum install ffmpeg
apt-get install ffmpeg
Mac
brew install ffmpeg
Windows
- 可以在这儿下载编译好的FFmpeg
- 解压到 /path/to/ffmpeg
- 添加 /path/to/ffmpeg/bin 到你的环境变量 PATH 中。
- 打开命令行，执行 ffmpeg -version
具体的ffmpeg命令可以参考下面的文档
其他解释
全金属被甲弹（FMJ - Full Metal Jacket）
弹头为铅质或铅锑合金以提升比重与质量，然而铅质延展性过强以致于如果直接作为弹头发射，会于击发时碎裂或与枪管摩擦产生变形，最后与大气作不良的空气动力结合而失去弹道精准性。因此将铅为铜所完全包覆，使弹头能够承受击发时的推进力又不会磨损变形；然而较轻的比重与质量使得全金属包覆弹进入密度高的目标物，例如人体（人体密度为大气的1000倍），就会因为因惯性而产生的动能扩散于目标物上，以至于动能对目标物所产生的作用力结合入射角/反射角的效应而产生滚转。这个滚转为预期与期盼的效果，尽管子弹终端弹道的滚转不可预期，然而滚转的途径势必能够造成深层广泛的肌肉撕裂伤，甚至切断动脉击碎骨骼，而造成人员严重的伤害与死亡。
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