# Create Unsteady Dataset from Steady Dataset for Particle Tracer .pvd-data

**URL:** https://discourse.paraview.org/t/create-unsteady-dataset-from-steady-dataset-for-particle-tracer-pvd-data/9398
**Category:** ParaView Support
**Created:** [April 9, 2022, 8:34pm UTC](https://discourse.paraview.org/t/create-unsteady-dataset-from-steady-dataset-for-particle-tracer-pvd-data/9398 "2022-04-09T20:34:28Z")
**Posts on this page:** 2
**Page:** 1

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### Author: ![alkali](https://discourse.paraview.org/letter_avatar_proxy/v4/letter/a/9f8e36/32.png) [@alkali](https://discourse.paraview.org/u/alkali)
#### Post date: [April 9, 2022, 8:34pm UTC](https://discourse.paraview.org/t/create-unsteady-dataset-from-steady-dataset-for-particle-tracer-pvd-data/9398/1 "2022-04-09T20:34:28Z")

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Hello,

I have a question related to the following webinar:

[![](https://discourse.paraview.org/uploads/default/original/2X/7/7ae9a91a1ff3b108a0e6f362ad713d29d9a9174c.jpeg "Kitware ParaView Streamlines Webinar") ](https://www.youtube.com/watch?v=7WMaHXLK6No)

Starting at 45:15 it shows how to create an unsteady dataset from a steady dataset.  
Unfortunately the .vtu format is not supported anymore or? Also, you can’t use the vtu/vtk format with multiple cores with Paraview-MPI, or am I wrong here?

Anyway, my question is if it would also be possible to add multiple pvd files equivalent to the video one after the other? Simply swapping the file extensions results in an error for me, unfortunately. I have attached a screenshot of the file and the error.

A second question would be if someone can recommend a file format for large files for particle tracking regarding speed.

Thanks a lot for the help!

 ![2](https://discourse.paraview.org/uploads/default/original/2X/2/2605244016ed1009f8687c9d4e6871c504c5df3d.png)  
 ![1](https://discourse.paraview.org/uploads/default/original/2X/4/47062cf9a6485629f3f844cf6fa81d037605e56c.png)

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### Author: ![mwestphal](https://discourse.paraview.org/user_avatar/discourse.paraview.org/mwestphal/32/17_2.png) [@mwestphal](https://discourse.paraview.org/u/mwestphal)
#### Post date: [April 11, 2022, 7:40am UTC](https://discourse.paraview.org/t/create-unsteady-dataset-from-steady-dataset-for-particle-tracer-pvd-data/9398/2 "2022-04-11T07:40:53Z")

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Hi @alkali ,

> [@alkali](#):
>
> Unfortunately the .vtu format is not supported anymore or? Also, you can’t use the vtu/vtk format with multiple cores with Paraview-MPI, or am I wrong here?

Your file is incorrect, you want to create a .series file with this kind of formalism:

[https://gitlab.kitware.com/paraview/paraview/blob/v5.5.0/Documentation/release/ParaView-5.5.0.md#user-content-json-based-new-meta-file-format-for-series-added](https://gitlab.kitware.com/paraview/paraview/blob/v5.5.0/Documentation/release/ParaView-5.5.0.md#user-content-json-based-new-meta-file-format-for-series-added)

Best,