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mxnet-videoio's Introduction

本工程封装MXNet Rec接口，实现视频I/O读取速度优化.

优化前后性能对比

mxnet: 1.0.1
network: BN-Inception
machine: GTX 1080ti
data classes: 101
number of frames: 3f/video
frame resolution: 256x320

读取方式                       单个gpu             4个gpu                                
cv2.imread，单线程 速度：23.44samples/sec 显存: 9491MB 速度： 26.81samples/sec 显存: 12274MB  
cv2.imread，多线程（10） 速度：23.44samples/sec 显存: 9481MB 速度： 26.81samples/sec 显存: 12274MB  
优化后   速度：120.50 samples/sec 显存: 9497MB 速度： 464.67 samples/sec 显存: 12298MB

接口使用姿势

1:本工程未提供截帧程序，视频需要提前截帧，每个视频对应的帧图像存放在同一个文件夹

2:遍历文件夹，生成训练列表文件，文件每行描述一个视频信息，格式为：‘文件夹绝对路径 ，截取的帧图像数，视频所属类别’

3:运行video2rec.py读取txt文件，将图像打包成rec文件

4:运行dataloader.py读取rec文件，并打包成 VideoDataIter

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