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• Duplicate input stream into many output streams

  10 juin 2017, par Farshad

  I want to catch my ip camera stream and distribute it into for example 10 different streams with ffmpeg ? How can i do that ? I have checked here but nothing helpful.

  Is it possible or is there any better option ?

• Python VTK, how to record a video ?

  15 avril 2016, par Maksim Surov

  I am trying to record a video of VTK 3D animation using ffmpeg. The example I found http://www.itk.org/Wiki/VTK/Examples/Cxx/Video/FFMPEG is a bit strange for me, because it does not create a render, so it is not clear how to attach actors in this case. So, my question is how to connect vtkRenderer to vtkFFMPEGWriter ? I wrote a simplified example

  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()

• Adding Gapless Playback information to AAC

  13 juillet 2018, par StaticBR

  im currently trying to develop an Video / Audio encoding pipline.
  My goal is it to encode mp4 files containing an h264 video track and an AAC audio Track. These files should be played one after another without any gaps in between.

  Currently im converting the videos with ffmpeg.
  Unfortunately my input files are missing the gapless playback metadata, which will be needed for gapless playback of the AAC track.

  Infact im looking for a way to add the iTunSMPB udta comment, as it is needed by the Exoplayer. (See Parser for Details : GaplessInfoHolder.java )

  I could not find a way to add this via ffmpeg ( ffmpeg AAC encoder doc), did i maybe missed something ?

  Even Wikipedia only lists two converters that should be able to do that : Nero Digital and Itunes. But this infomation could be outdated.

  Do anyone of you know a java library or (linux) command that can add this metadata to an mp4 file ?

  I hope some of you might be able to help me.
  Thank you.