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Minimizing audio capture latency in DirectShow | 6581 ...
https://sid6581.wordpress.com/2006/10/09/minimizing-audio-capture-latency-in-directshow/
Call this function with your audio capture pin and your desired latency in milliseconds (try 50ms), and your latency problems should hopefully be taken care of. HRESULT SetAudioLatency(IPin *AudioCapturePin, int BufferSizeMilliSeconds) { assert(AudioCapturePin); assert(BufferSizeMilliSeconds > 0); // Get the interfaces we need.
Setting Audio Capture Properties - Win32 apps | …
https://docs.microsoft.com/en-us/windows/win32/directshow/setting-audio-capture-properties
This interface is useful for controlling the amount of latency in audio preview. By default, the Audio Capture filter uses a half-second buffer size. This buffer size is optimal for capturing but causes a half-second preview delay. To reduce the latency, call the IAMBufferNegotiation::SuggestAllocatorProperties method before you connect the Audio …
Live Sources - Win32 apps | Microsoft Docs
https://docs.microsoft.com/en-us/windows/win32/directshow/live-sources
Latency. A filter's latency is the amount of time it takes the filter to process a sample. For live sources, the latency is determined by the size of the buffer used to hold samples. For example, suppose the filter graph has a video source with a latency of 33 milliseconds (ms) and an audio source with a latency of 500 ms.
audio - How to eliminate 1 second delay in DirectShow ...
https://stackoverflow.com/questions/7881420/how-to-eliminate-1-second-delay-in-directshow-filter-chain-using-delphi-and-ds
// Calculate the size of the buffer needed to get the desired // latency in milliseconds given the average bytes per second // of the Media Type's audio format. allocProp.cbBuffer := Trunc(wfex.nAvgBytesPerSec * (bufLatencyMS / 1000)); allocProp.cbPrefix := -1; allocProp.cBuffers := -1; // Try to set the buffer size to the desired.
Why do I experience latency when using a capture card?
https://knowledge.dataton.com/knowledge/why-do-i-experience-latency-when-using-a-capture-card
Getting the frame from DirectShow and showing it on the screen usually takes two display frames due to double buffering. So, if you are running the displays at 60 Hz then WATCHOUT will add around 33 ms. All other latency comes from the DirectShow capture filter and capture hardware. Most hi-end hardware adds around one frame when not re-sampling etc.
Audio Capture - Win32 apps | Microsoft Docs
https://docs.microsoft.com/en-us/windows/win32/directshow/audio-capture
An application can use DirectShow to capture audio data from microphones, tape players, and other devices, through the inputs on the sound card. Typical scenarios include: Recording a voiceover narration for later dubbing over a video stream. Converting legacy analog audio content to digital format.
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