[vtkusers] vtkAVIWriter with renderer gradient background shows distinct lines

[Santosh Biradar]

Sorry for the late reply Cory
I tried the following options via  vtkAVIWriter's SetCompressorFourCC()
method

'MSVC'(default) - works but gives the scattered lines in the background
for gradient background
'DIB' -  Full Frames (Uncompressed) - works well and removes the gradient
background problem - creates large AVI files (upto 300 MB for a 4-5 second
animation)
'LAGS' - Lagarith Lossless Codec - got unknown compressor error
'MJPG' - got unknown compressor error
'DIVX'  - got unknown compressor error
'XVID' - got unknown compressor error
'H264' - got unknown compressor error

Thanks,
Santosh

On Fri, Nov 30, 2018 at 7:51 PM Cory Quammen <cory.quammen at kitware.com>
wrote:

> Great, glad to hear it. What compression options did you settle on in
> case someone runs into this issue in the future?
> On Fri, Nov 30, 2018 at 8:30 AM Santosh Biradar <scbiradar at gmail.com>
> wrote:
> >
> > Thanks Cory. I was able to try different compression options and was
> able to remove the background lines appearing because of the gradient
> albeit with large size of the AVI files.
> > Thanks Andras for pointing me to an alternate to vtkAVIWriter. I will
> explore the MKV container.
> >
> > Santosh
> >
> > On Wed, Nov 28, 2018 at 1:01 PM Andras Lasso <lasso at queensu.ca> wrote:
> >>
> >> In 3D Slicer we use VP9 codec with MKV container and it works well. VP9
> is not as widely used as H264 but it is completely royalty-free and offers
> good compression ratio and acceptable speed even with lossless settings.
> >>
> >>
> >>
> >> We build required libraries (VP9, libwbm, yasm) using CMake superbuild
> on Windows/Linux/Mac. Container file reading/writing implementation is
> here:
> https://github.com/IGSIO/IGSIO/blob/master/Source/VideoIO/MKV/vtkMKVWriter.cxx,
> and VP9 codec is here:
> https://github.com/IGSIO/SlicerIGSIO/blob/master/VideoIO/Codecs/vtkVP9VolumeCodec.cxx
> .
> >>
> >>
> >>
> >> Andras
> >>
> >>
> >>
> >> From: vtkusers <vtkusers-bounces at public.kitware.com> On Behalf Of Cory
> Quammen
> >> Sent: Tuesday, November 27, 2018 10:11 AM
> >> To: santosh <scbiradar at gmail.com>
> >> Cc: vtkusers <vtkusers at vtk.org>
> >> Subject: Re: [vtkusers] vtkAVIWriter with renderer gradient background
> shows distinct lines
> >>
> >>
> >>
> >> I'm afraid I don't have a lot of experience with the AVI compression
> options. You might experiment with vtkAVIWriter::SetCompressorFourCC() to
> see if you can find a compressor that gives more satisfactory results.
> >>
> >>
> >>
> >> Personally I prefer to dump animation frames and assemble them with
> outside video software.
> >>
> >>
> >>
> >> Cory
> >>
> >>
> >>
> >> On Tue, Nov 27, 2018 at 9:26 AM Santosh Biradar <scbiradar at gmail.com>
> wrote:
> >>
> >> Thanks for the quick response Cory.
> >>
> >> I tried setting quality to 0,1,2. The quality of the movie was best for
> 2 and worst for 0 but the background remained the same in each case.
> >>
> >> The quality of the output of the  filter (in this case, a
> vtkContourFilter) reduces with reduction in SetQuality but the background
> remains of the same quality.
> >>
> >> There is no difference in the quality of the background.
> >>
> >>
> >>
> >> I also get the same behavior in Paraview's Save Animation feature
> (version 5.5 on windows)
> >>
> >>
> >>
> >> Thanks,
> >>
> >> Santosh
> >>
> >>
> >>
> >>
> >>
> >> On Tue, Nov 27, 2018 at 7:29 PM Cory Quammen <cory.quammen at kitware.com>
> wrote:
> >>
> >> Sounds like quantization/compression artifacts. You can try changing
> the quality setting to reduce compression via vtkAVIWriter::SetQuality().
> >>
> >>
> >>
> >> HTH,
> >>
> >> Cory
> >>
> >>
> >>
> >> On Tue, Nov 27, 2018 at 8:55 AM Santosh Biradar <scbiradar at gmail.com>
> wrote:
> >>
> >> I am trying to create a movie of an animation using vtkAVIWriter.
> >>
> >> The renderer has a gradient background. The .avi file created has
> distinct lines/bands in the background because of the gradient. Is it
> possible to get rid of these lines. I notice that if I use a vtkBMPWriter
> and write an image, the image seems fine without any such lines/bands.
> >>
> >>
> >>
> >> A code snippet of what I am doing:
> >>
> >>
> >>
> >> window_to_image = vtk.vtkWindowToImageFilter()
> >> window_to_image.SetInput(renWin.GetRenderWindow())
> >> window_to_image.SetInputBufferTypeToRGB()
> >> window_to_image.ReadFrontBufferOff()
> >>
> >> writer = vtk.vtkAVIWriter()
> >> writer.SetInputConnection(window_to_image.GetOutputPort())
> >>
> >> I am running python wrapper of VTK-6.3.0 on windows
> >>
> >>
> >>
> >> Thanks,
> >>
> >> Santosh
> >>
> >>
> >>
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> >>
> >>
> >> --
> >>
> >> Cory Quammen
> >> Staff R&D Engineer
> >> Kitware, Inc.
> >>
> >>
> >>
> >>
> >> --
> >>
> >> Cory Quammen
> >> Staff R&D Engineer
> >> Kitware, Inc.
>
>
>
> --
> Cory Quammen
> Staff R&D Engineer
> Kitware, Inc.
>
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