<div dir="ltr">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.<div>Thanks Andras for pointing me to an alternate to vtkAVIWriter. I will explore the MKV container.</div><div><br></div><div>Santosh</div></div><br><div class="gmail_quote"><div dir="ltr">On Wed, Nov 28, 2018 at 1:01 PM Andras Lasso <<a href="mailto:lasso@queensu.ca">lasso@queensu.ca</a>> wrote:<br></div><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">
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<p class="MsoNormal">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.<u></u><u></u></p>
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<p class="MsoNormal">We build required libraries (VP9, libwbm, yasm) using CMake superbuild on Windows/Linux/Mac. Container file reading/writing implementation is here:
<a href="https://github.com/IGSIO/IGSIO/blob/master/Source/VideoIO/MKV/vtkMKVWriter.cxx" target="_blank">
https://github.com/IGSIO/IGSIO/blob/master/Source/VideoIO/MKV/vtkMKVWriter.cxx</a>, and VP9 codec is here:
<a href="https://github.com/IGSIO/SlicerIGSIO/blob/master/VideoIO/Codecs/vtkVP9VolumeCodec.cxx" target="_blank">
https://github.com/IGSIO/SlicerIGSIO/blob/master/VideoIO/Codecs/vtkVP9VolumeCodec.cxx</a>.
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<p class="MsoNormal">Andras<u></u><u></u></p>
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<p class="MsoNormal"><b>From:</b> vtkusers <<a href="mailto:vtkusers-bounces@public.kitware.com" target="_blank">vtkusers-bounces@public.kitware.com</a>> <b>
On Behalf Of </b>Cory Quammen<br>
<b>Sent:</b> Tuesday, November 27, 2018 10:11 AM<br>
<b>To:</b> santosh <<a href="mailto:scbiradar@gmail.com" target="_blank">scbiradar@gmail.com</a>><br>
<b>Cc:</b> vtkusers <<a href="mailto:vtkusers@vtk.org" target="_blank">vtkusers@vtk.org</a>><br>
<b>Subject:</b> Re: [vtkusers] vtkAVIWriter with renderer gradient background shows distinct lines<u></u><u></u></p>
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<p class="MsoNormal">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.<u></u><u></u></p>
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<p class="MsoNormal">Personally I prefer to dump animation frames and assemble them with outside video software.<u></u><u></u></p>
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<p class="MsoNormal">Cory<u></u><u></u></p>
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<p class="MsoNormal">On Tue, Nov 27, 2018 at 9:26 AM Santosh Biradar <<a href="mailto:scbiradar@gmail.com" target="_blank">scbiradar@gmail.com</a>> wrote:<u></u><u></u></p>
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<p class="MsoNormal">Thanks for the quick response Cory.<u></u><u></u></p>
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<p class="MsoNormal">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. <u></u><u></u></p>
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<p class="MsoNormal">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. <u></u><u></u></p>
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<p class="MsoNormal">There is no difference in the quality of the background.<u></u><u></u></p>
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<p class="MsoNormal">I also get the same behavior in Paraview's Save Animation feature (version 5.5 on windows)<u></u><u></u></p>
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<p class="MsoNormal">Thanks,<u></u><u></u></p>
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<p class="MsoNormal">Santosh<u></u><u></u></p>
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<p class="MsoNormal">On Tue, Nov 27, 2018 at 7:29 PM Cory Quammen <<a href="mailto:cory.quammen@kitware.com" target="_blank">cory.quammen@kitware.com</a>> wrote:<u></u><u></u></p>
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<p class="MsoNormal">Sounds like quantization/compression artifacts. You can try changing the quality setting to reduce compression via vtkAVIWriter::SetQuality().<u></u><u></u></p>
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<p class="MsoNormal">HTH,<u></u><u></u></p>
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<p class="MsoNormal">Cory<u></u><u></u></p>
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<p class="MsoNormal">On Tue, Nov 27, 2018 at 8:55 AM Santosh Biradar <<a href="mailto:scbiradar@gmail.com" target="_blank">scbiradar@gmail.com</a>> wrote:<u></u><u></u></p>
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<p class="MsoNormal">I am trying to create a movie of an animation using vtkAVIWriter.<u></u><u></u></p>
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<p class="MsoNormal">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.<u></u><u></u></p>
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<p class="MsoNormal">A code snippet of what I am doing:<u></u><u></u></p>
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<pre><span style="font-size:9.0pt;color:black">window_to_image = vtk.vtkWindowToImageFilter()<br>window_to_image.SetInput(renWin.GetRenderWindow())<br>window_to_image.SetInputBufferTypeToRGB()<br>window_to_image.ReadFrontBufferOff()<br><br>writer = vtk.vtkAVIWriter()<br>writer.SetInputConnection(window_to_image.GetOutputPort())<u></u><u></u></span></pre>
<pre><span style="font-size:12.0pt;font-family:"Arial",sans-serif;color:#222222">I am running python wrapper of VTK-6.3.0 on windows</span><span style="font-size:9.0pt;color:black"><u></u><u></u></span></pre>
<pre><span style="font-size:9.0pt;color:black"><u></u> <u></u></span></pre>
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<pre><span style="font-size:12.0pt;font-family:"Arial",sans-serif;color:#222222">Thanks,<u></u><u></u></span></pre>
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<pre><span style="font-size:12.0pt;font-family:"Arial",sans-serif;color:#222222">Santosh<u></u><u></u></span></pre>
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<pre><span style="font-size:12.0pt;font-family:"Arial",sans-serif;color:#222222"><u></u> <u></u></span></pre>
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<p class="MsoNormal">-- <u></u><u></u></p>
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<p class="MsoNormal">Cory Quammen<br>
Staff R&D Engineer<br>
Kitware, Inc.<u></u><u></u></p>
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<p class="MsoNormal">-- <u></u><u></u></p>
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<p class="MsoNormal">Cory Quammen<br>
Staff R&D Engineer<br>
Kitware, Inc.<u></u><u></u></p>
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