DirectShow transform filter with multiple video frames - Sync with audio

Question

I've written a DirectShow transform filter (in C# but concept is the same in C++) which buffers multiple video frames before sending them to the renderer (hence a delay). These frames are processed before producing an output frame (think sliding window of say 6 frames).

On a 6fps video source, this causes a 1 second delay. Audio ends up playing back 1 second ahead of video. How do I tell the graph to delay audio by the same amount?

Answer 1

Video and audio renderers present data respecting attached time stamps. You need to restamp your audio data adding the desired delay.