COMP: further fixes for FFMPEGWriter.
COMP: further fixes for FFMPEGWriter.

Wuteyan/VTK,spthaolt/VTK,gram526/VTK,demarle/VTK,arnaudgelas/VTK,arnaudgelas/VTK,msmolens/VTK,msmolens/VTK,keithroe/vtkoptix,keithroe/vtkoptix,jmerkow/VTK,SimVascular/VTK,gram526/VTK,sankhesh/VTK,sumedhasingla/VTK,sumedhasingla/VTK,mspark93/VTK,candy7393/VTK,sankhesh/VTK,ashray/VTK-EVM,aashish24/VTK-old,naucoin/VTKSlicerWidgets,biddisco/VTK,aashish24/VTK-old,msmolens/VTK,johnkit/vtk-dev,jmerkow/VTK,sankhesh/VTK,berendkleinhaneveld/VTK,johnkit/vtk-dev,naucoin/VTKSlicerWidgets,johnkit/vtk-dev,ashray/VTK-EVM,johnkit/vtk-dev,gram526/VTK,demarle/VTK,keithroe/vtkoptix,jmerkow/VTK,biddisco/VTK,ashray/VTK-EVM,demarle/VTK,collects/VTK,jeffbaumes/jeffbaumes-vtk,ashray/VTK-EVM,gram526/VTK,johnkit/vtk-dev,cjh1/VTK,Wuteyan/VTK,biddisco/VTK,naucoin/VTKSlicerWidgets,spthaolt/VTK,demarle/VTK,candy7393/VTK,sumedhasingla/VTK,collects/VTK,hendradarwin/VTK,gram526/VTK,johnkit/vtk-dev,collects/VTK,mspark93/VTK,Wuteyan/VTK,naucoin/VTKSlicerWidgets,arnaudgelas/VTK,hendradarwin/VTK,ashray/VTK-EVM,sumedhasingla/VTK,daviddoria/PointGraphsPhase1,mspark93/VTK,ashray/VTK-EVM,mspark93/VTK,keithroe/vtkoptix,jeffbaumes/jeffbaumes-vtk,mspark93/VTK,candy7393/VTK,SimVascular/VTK,msmolens/VTK,jeffbaumes/jeffbaumes-vtk,daviddoria/PointGraphsPhase1,daviddoria/PointGraphsPhase1,jeffbaumes/jeffbaumes-vtk,jmerkow/VTK,berendkleinhaneveld/VTK,aashish24/VTK-old,spthaolt/VTK,demarle/VTK,mspark93/VTK,msmolens/VTK,spthaolt/VTK,Wuteyan/VTK,sumedhasingla/VTK,msmolens/VTK,SimVascular/VTK,hendradarwin/VTK,berendkleinhaneveld/VTK,candy7393/VTK,jmerkow/VTK,aashish24/VTK-old,collects/VTK,hendradarwin/VTK,collects/VTK,berendkleinhaneveld/VTK,SimVascular/VTK,keithroe/vtkoptix,biddisco/VTK,candy7393/VTK,aashish24/VTK-old,demarle/VTK,SimVascular/VTK,sankhesh/VTK,arnaudgelas/VTK,jeffbaumes/jeffbaumes-vtk,ashray/VTK-EVM,SimVascular/VTK,keithroe/vtkoptix,biddisco/VTK,gram526/VTK,cjh1/VTK,demarle/VTK,sankhesh/VTK,naucoin/VTKSlicerWidgets,sankhesh/VTK,daviddoria/PointGraphsPhase1,cjh1/VTK,sumedhasingla/VTK,biddisco/VTK,hendradarwin/VTK,keithroe/vtkoptix,mspark93/VTK,aashish24/VTK-old,hendradarwin/VTK,demarle/VTK,spthaolt/VTK,Wuteyan/VTK,collects/VTK,jmerkow/VTK,candy7393/VTK,msmolens/VTK,sumedhasingla/VTK,hendradarwin/VTK,arnaudgelas/VTK,jeffbaumes/jeffbaumes-vtk,keithroe/vtkoptix,daviddoria/PointGraphsPhase1,spthaolt/VTK,Wuteyan/VTK,candy7393/VTK,candy7393/VTK,cjh1/VTK,gram526/VTK,Wuteyan/VTK,berendkleinhaneveld/VTK,johnkit/vtk-dev,sankhesh/VTK,cjh1/VTK,cjh1/VTK,jmerkow/VTK,daviddoria/PointGraphsPhase1,berendkleinhaneveld/VTK,gram526/VTK,naucoin/VTKSlicerWidgets,sumedhasingla/VTK,berendkleinhaneveld/VTK,mspark93/VTK,sankhesh/VTK,spthaolt/VTK,SimVascular/VTK,biddisco/VTK,msmolens/VTK,ashray/VTK-EVM,jmerkow/VTK,arnaudgelas/VTK,SimVascular/VTK