m_lVidPitch = m_lVidWidth * 4; 

quote:
Pitch is the distance, in bytes, between two memory addresses that represent the beginning of one bitmap line and the beginning of the next bitmap line. Because pitch is measured in bytes rather than pixels, a 640x480x8 surface has a very different pitch value than a surface with the same dimensions but a different pixel format. Additionally, the pitch value sometimes reflects bytes that Direct3D has reserved as a cache, so it is not safe to assume that pitch is just the width multiplied by the number of bytes per pixel.
[..]
Do not assume a pitch based solely on the display mode. If your application works on some display adapters but looks garbled on others, this may be the cause of the problem.

void D3Drender( void ){	D3DXMATRIX matWorld;	D3DXMATRIX matTranslation;	D3DXMATRIX matRotation;	//-------------------------------------------------------------------------	// Use the "render to" surface for off-screen rendering	//-------------------------------------------------------------------------	m_pRenderToSurface->BeginScene( m_pTextureSurface, NULL );        g_pD3DDevice->Clear( 0, NULL, D3DCLEAR_TARGET | D3DCLEAR_ZBUFFER, 		                 D3DCOLOR_COLORVALUE(0.0f,1.0f,0.0f,0.0f), 1.0f, 0);	//	// We'll need to change the projection matrix on the device, to match the 	// off-screen surface's dimensions, or the cube will look wrong.	//	g_pD3DDevice->SetTransform( D3DTS_PROJECTION, &g_matProjection_offscreenSurface );	//	// Let the user spin the cube about with the right mouse button, so our 	// dynamic texture will show motion.	//        D3DXMatrixTranslation( &matTranslation, g_fTransX_L, g_fTransY_L, 8.0f );	D3DXMatrixRotationYawPitchRoll( &matRotation, 		                            D3DXToRadian(g_fSpinX_R),		                            D3DXToRadian(g_fSpinY_R),		                            0.0f );        matWorld = matRotation * matTranslation;        g_pD3DDevice->SetTransform( D3DTS_WORLD, &matWorld );        //	// Now the render the cube to the off-screen surface	//        g_pD3DDevice->SetTexture( 0, g_pTestTexture );	g_pD3DDevice->SetStreamSource( 0, g_pVertexBuffer, 0, sizeof(Vertex) );        g_pD3DDevice->SetFVF( Vertex::FVF_Flags );	g_pD3DDevice->DrawPrimitive( D3DPT_TRIANGLESTRIP,  0, 2 );	g_pD3DDevice->DrawPrimitive( D3DPT_TRIANGLESTRIP,  4, 2 );	g_pD3DDevice->DrawPrimitive( D3DPT_TRIANGLESTRIP,  8, 2 );	g_pD3DDevice->DrawPrimitive( D3DPT_TRIANGLESTRIP, 12, 2 );	g_pD3DDevice->DrawPrimitive( D3DPT_TRIANGLESTRIP, 16, 2 );	g_pD3DDevice->DrawPrimitive( D3DPT_TRIANGLESTRIP, 20, 2 );        m_pRenderToSurface->EndScene( 0 );        g_pD3DDevice->GetRenderTargetData(m_pTextureSurface, g_pSurface);}//---------------------------------------------------------//---------------------------------------------------------// This is where we insert the surface bits into the video stream.// FillBuffer is called once for every sample in the stream.HRESULT CPushPinD3D::FillBuffer(IMediaSample *pSample){    BYTE *pData;    long cbData;    CheckPointer(pSample, E_POINTER);    CAutoLock cAutoLockShared(&m_cSharedState);    // Access the sample's data buffer    pSample->GetPointer(&pData);    cbData = pSample->GetSize();    // Check that we're still using video    ASSERT(m_mt.formattype == FORMAT_VideoInfo);    VIDEOINFOHEADER *pVih = (VIDEOINFOHEADER*)m_mt.pbFormat;    // Copy the surface bits over into our filter's output buffer.    LPDIRECT3DSURFACE9 pD3DSurface = NULL;	//D3D Source Surface    PushSourceD3D()->get_D3DSurface(&pD3DSurface);    D3DSURFACE_DESC surfaceDesc;    pD3DSurface->GetDesc(&surfaceDesc);    D3DLOCKED_RECT d3dlr;    BYTE  *pSurfaceBuffer;    pD3DSurface->LockRect(&d3dlr, 0, D3DLOCK_DONOTWAIT);    pSurfaceBuffer = (BYTE *) d3dlr.pBits + d3dlr.Pitch*(surfaceDesc.Height - 1);    int m_lVidPitch  = surfaceDesc.Width * 4; //video sample pitch    for (int i=0;i<(int)surfaceDesc.Height;i++)    {	memcpy(pData+(surfaceDesc.Height - i - 1) * surfaceDesc.Width * 4, (BYTE*) d3dlr.pBits + i * d3dlr.Pitch, surfaceDesc.Width * 4);    }    pD3DSurface->UnlockRect();    // Set the timestamps that will govern playback frame rate.    // If this file is getting written out as an AVI,    // then you'll also need to configure the AVI Mux filter to     // set the Average Time Per Frame for the AVI Header.    // The current time is the sample's start.    REFERENCE_TIME rtStart = m_iFrameNumber * m_rtFrameLength;    REFERENCE_TIME rtStop  = rtStart + m_rtFrameLength;    pSample->SetTime(&rtStart, &rtStop);    m_iFrameNumber++;    // Set TRUE on every sample for uncompressed frames    pSample->SetSyncPoint(TRUE);    return S_OK;}