FFmpeg錄製Windows桌面&攝像頭&麥克風

錄製桌面

1. 使用GDI screengrabber可以錄製主屏幕的內容

   You can also use gdigrab as input device to grab video from the Windows screen.

   To capture all your displays as one big contiguous display:

   ffmpeg -f gdigrab -framerate 30 -i desktop output.mkv
   

   If you want to limit to a region, and show the area being grabbed:

   ffmpeg -f gdigrab -framerate 30 -offset_x 10 -offset_y 20 -video_size 640x480 -show_region 1 -i desktop output.mkv
   

   To grab the contents of the window named “Calculator”:

   ffmpeg -f gdigrab -framerate 30 -i title=Calculator output.mkv
   

• 存在問題：縮放時耗費時間過長，導致幀率不高

2.使用screen capture recorder無法全屏錄製桌面

錄製音頻

ffmpeg -f dshow -i audio="virtual-audio-capturer" -acodec libmp3lame window.mp3

avdevice_register_all();

	pInputFmt = av_find_input_format("dshow");
	if (avformat_open_input(&pFmtCtx, "audio=virtual-audio-capturer", pInputFmt, &pOptions) < 0) {
		av_log(nullptr, AV_LOG_ERROR, "cant not open input file.\n");
		return -1;
	}

	av_dump_format(pFmtCtx, 0, "audio=virtual-audio-capturer", 0);

錄製攝像頭

查看輸入設備：

ffmpeg.exe -f dshow -list_devices true -i dummy

查看攝像頭圖像：

ffplay.exe -f dshow -video_size 640x480 -i video="HD WebCam"

avdevice_register_all();
pInputFmt = av_find_input_format("dshow");
int ret = avformat_open_input(&m_InputFmtCtx, "video=HD WebCam", pInputFmt, nullptr);
if (ret < 0)
{
	av_log(nullptr, AV_LOG_ERROR, "Could not open input file.\n");
	goto ERROR_PROC;
}

錄製麥克風

播放麥克風聲音：

ffplay.exe -f dshow -i audio="麥克風 (Realtek High Definition Audio)"

錄製USB攝像頭

ffmpeg.exe -f dshow -video_size 1280x720 -i video="HD USB Camera" -vcodec copy -rtsp_transport tcp -f rtsp rtsp://localhost/test