I cant save animation of my simulation

I can not save an animation of my simulation. I am using ParaView 5.4.1 64 bit on Ubuntu with an NVIDIA GT430 graphics card: I get the following warnings and errors:

Generic Warning: In /build/paraview-lH8wFv/paraview-5.4.1+dfsg3/VTK/Rendering/Volume/vtkVolumeTextureMapper3D.cxx, line 680

vtkVolumeTextureMapper3D::vtkVolumeTextureMapper3D was deprecated for VTK 7.0 and will be removed in a future version.

Generic Warning: In /build/paraview-lH8wFv/paraview-5.4.1+dfsg3/VTK/Rendering/VolumeOpenGL/vtkOpenGLVolumeTextureMapper3D.cxx, line 57

vtkOpenGLVolumeTextureMapper3D::vtkOpenGLVolumeTextureMapper3D was deprecated for VTK 7.0 and will be removed in a future version.

Generic Warning: In /build/paraview-lH8wFv/paraview-5.4.1+dfsg3/VTK/Rendering/Volume/vtkVolumeTextureMapper3D.cxx, line 680

vtkVolumeTextureMapper3D::vtkVolumeTextureMapper3D was deprecated for VTK 7.0 and will be removed in a future version.

Generic Warning: In /build/paraview-lH8wFv/paraview-5.4.1+dfsg3/VTK/Rendering/VolumeOpenGL/vtkOpenGLVolumeTextureMapper3D.cxx, line 57

vtkOpenGLVolumeTextureMapper3D::vtkOpenGLVolumeTextureMapper3D was deprecated for VTK 7.0 and will be removed in a future version.

Warning: In /build/paraview-lH8wFv/paraview-5.4.1+dfsg3/ParaViewCore/Animation/vtkSMSaveAnimationProxy.cxx, line 166

vtkSMSaveAnimationProxy (0x563b87a3b010): The requested resolution '(998, 519)' has been changed to '(996, 516)' to match format specification.

Generic Warning: In /build/paraview-lH8wFv/paraview-5.4.1+dfsg3/VTK/IO/FFMPEG/vtkFFMPEGWriter.cxx, line 449

Problem encoding frame.

ERROR: In /build/paraview-lH8wFv/paraview-5.4.1+dfsg3/VTK/IO/FFMPEG/vtkFFMPEGWriter.cxx, line 620

vtkFFMPEGWriter (0x563b86f7d2e0): Error storing image.

Do not use the avi writer in ParaView. It produce low quality high size frames.
I would recommend using the png writer to save your animation and then use ffmpeg to create your video.