SetSupplier
fAudioSupplier->SetSupplier(NULL, fVideoFrameRate);
fVideoSupplier->SetSupplier(NULL);
fAudioSupplier->SetSupplier(fAudioTrackSupplier, fVideoFrameRate);
fVideoSupplier->SetSupplier(fVideoTrackSupplier);
SetSupplier(fSupplier, fVideoFrameRate);
void SetSupplier(AudioTrackSupplier* supplier,
void SetSupplier(VideoTrackSupplier* supplier);