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使用VS2015打开项目,运行就能生出视频。

  • 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。

  • MuxThreadProc:复用线程,启动音视频采集线程。打开输入/输出流,然后从fifoBuffer读取帧,编码生成各种格式视频。

  • ScreenRecordThreadProc:视频采集线程,从输入流采集帧,缩放后写入fifoBuffer。

  • SoundRecordThreadProc:音频采集线程,从输入流采集样本,重采样后写入fifoBuffer。

注意

  1. 如果电脑没有麦克风的话,音频会打开失败,导致程序退出。
  2. 音视频采集的帧数实际上是达不到25帧的(具体1秒能采集多少帧据说看机器配置),所以录制10秒的视频可能只有6秒,也就是机器1秒只能采集15帧,因为在帧率固定的情况下,后面的帧往前补充了,所以你也能感觉到视频加快了。解决这个问题可以考虑插帧法,保证帧数足够。网上搜了一下没有找到相关的算法,以后有机会再看看FFmpeg源码是怎么实现的,不过可能有点难:)

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