Hi All, I have 2 separate filters, each having their own DispatchProcess routines. As my current driver is based on "avssamp" sample. Currently my both filter are having one single unique dataformat of 44100 , 16bit , 2 channels. Capture Process :- In case of capture filter's DispatchProcess, I read from a file and render it on Capture pin's Data obviously depending on Capture Pin's BytesAvailable. So here I calculate how much data to be rendered // // Compute the number of bytes of audio data necessary to move the stream // forward TimeDelta time. Remember that TimeDelta is in units of 100nS. // ULONG Samples = (ULONG)( (m_WaveFormat.nSamplesPerSec * TimeDelta) / 10000000 ); ULONG Bytes = Samples * (m_WaveFormat.wBitsPerSample / 8) * m_WaveFormat.nChannels; This comes out to be 5884 and ProcessPin->BytesAvailable is 8192. So 5884 bytes are copied on Pin. Render Process :- In case of render process where same file is rendered with same format 44100,16,2 ProcessPin->BytesAvailable is 1764. I checked with data it is getting received correctly but just in less bytes and which is different from captures request(8192), the slower rate, may be causing problems . I found that it was using Time Interval for DPC based on VideoInfoHeader->AvgTimerPerFrame which is 333667. My conjecture is that since it was a sample, only capture, and having complete data ready to send in CaptureProcess, M$ used same interval value for video as well as too audio . To me this looked more dark when checked file of 11sec is taking 40sec to render at this rate(333667) on render filter by graphedit. So I tried with lower different values could make it tentatively 11-12 sec, but I am sure this will not be accurate. Do you know what standard values to provide in AVStream in Timer for DPC ? Do I need different timer values for capture and render ? So Can I increase the size of reception of data in RenderProcess ? Or Is there any other way of getting both of them working in correct way ? -- ...Swapnil || Hare Krishna Hare Krishna Krishna Krishna Hare Hare || || Hare Rama Hare Rama Rama Rama Hare Hare ||