The screencapture-onlyvideo from asdlei99

screencapture-onlyvideo's Introduction

录屏功能支持：开始，暂停，结束。
使用Qt+C++封装FFmpeg API，没有使用废弃的FFmpeg API。
主线程：Qt GUI线程，以后可接入录屏UI。
父线程（读）：ScreenRecordThreadProc() 打开输入/输出流，创建子线程，然后从fifoBuffer读取帧，编码生成各种格式视频。
子线程（写）：ScreenAcquireThreadProc() 从输入流采集帧，缩放后写入fifoBuffer。
父子线程通过AVFifoBuffer（环形缓冲区）通信。是生存者与消费者的关系。使用条件信号和互斥量提高CPU利用率。
目前没添加录音功能，纯视频。

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