Cannot open audio stream...

[antithing]

Hi, and thanks for making this code available. I am trying to use it to record from the microphone port, and i am getting an error.

When i add:

 if (deviceName == "") {
        deviceName = DS_GetDefaultDevice("a");
        if (deviceName == "") {
            throw std::runtime_error("Fail to get default audio device, maybe no microphone.");
        }
    }

    deviceName = "audio=" + deviceName;
	std::cout << deviceName << std::endl;

it preints:

audio=Microphone (Realtek Audio)

which is as expected.

but the next section:

AVInputFormat *inputFormat = av_find_input_format("dshow");

    ret = avformat_open_input(&audioInFormatCtx, deviceName.c_str(), inputFormat, &options);
    if (ret != 0) {
		std::cout << ret << std::endl;
        throw std::runtime_error("Couldn't open input audio stream.");
    }

I get the following:

[dshow @ 0000023160812b40] Could not run graph (sometimes caused by a device already in use by other application)
-5
[ERROR] Couldn't open input audio stream.

When i use, for example, the default windows voice recorder application, it records fine from teh same port and device.

What could be causing this?

Thank you.

[modyuan]

it works fine to me... Does it just error when run the main1() in main.cpp? or you just call the function? (in this case you need to call avdevice_register_all(); at first)