我正在尝试使用ffmpeg录制VTK 3D动画的视频。我发现http://www.itk.org/Wiki/VTK/Examples/Cxx/Video/FFMPEG的示例对我来说有点奇怪，因为它没有创建渲染，因此不清楚如何在其中附加演员这个案例。所以，我的问题是如何连接vtkRenderer到vtkFFMPEGWriter？我写了一个简化的例子
import vtk
# draw a plane
plane_source = vtk.vtkPlaneSource()
plane_source.SetCenter(0, 0, 0)
plane_source.SetNormal(0, 0, 1)
plane_mapper = vtk.vtkPolyDataMapper()
plane_mapper.SetInput(plane_source.GetOutput())
plane_actor = vtk.vtkActor()
plane_actor.SetMapper(plane_mapper)
# create render
render = vtk.vtkRenderer()
renWin = vtk.vtkRenderWindow()
renWin.AddRenderer(render)
renWin.SetSize(800, 600)
renInter = vtk.vtkRenderWindowInteractor()
renInter.SetRenderWindow(renWin)
render.AddActor(plane_actor)
renWin.Render()
renInter.Initialize()
# set callback
def cb(interactor, event):
global plane_actor
plane_actor.RotateZ(0.1)
interactor.GetRenderWindow().Render()
renInter.AddObserver('TimerEvent', cb)
timerId = renInter.CreateRepeatingTimer(100);
# put something here?
writer = vtk.vtkFFMPEGWriter()
# ??? writer.SetInputConnection(...)
writer.SetFileName("test.avi")
writer.Start()
# run
renInter.Start()
使用vtkWindowToImageFilter（在此处进行描述）可以轻松解决该问题：
windowToImageFilter = vtk.vtkWindowToImageFilter()
windowToImageFilter.SetInput(renWin)
windowToImageFilter.SetInputBufferTypeToRGBA()
windowToImageFilter.ReadFrontBufferOff()
windowToImageFilter.Update()
writer = vtk.vtkAVIWriter()
writer.SetInputConnection(windowToImageFilter.GetOutputPort())
writer.SetFileName("test.avi")
...
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我来说两句