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Frequently Asked Questions (FAQ)

  • VA keeps nagging that the file I want to load can not be found
    • If you load a file from hard drive, it has to be placed on the computer where the VA server is running - not necessarily on the client side, if you are using a remote connection. Use relative paths for loading files only, avoid absolute paths. Add search paths (folders where your files can be found) to help VA find the files. You can do this in the configuration file of the VA server, or you can interactively add the search path over the VA interface.
  • I can't connect to my VA server, although I am certain that the IP and port is correct.
    • It is very likely, that your firewall has blocked the program due to insufficient privileges. This happens a lot in managed networks like universities, where you are not allowed to open a TCP/IP port. Please contact your network administration or check, if your firewall settings are blocking VA.
      Also, check if the versions are matching and you are not mixing different VA binary packages of different compiler versions. Especially if dynamic linking to ViSTA and VA libraries is used, this can lead to unpredictable behavior, because the DLLs will have the same name - but are incompatible. It is strongly recommended to use static linking for bindings like Python or Matlab for this reason.
  • My audio output sounds strange
    • Check your sampling rates and buffer sizes.
      Do not overload your computer. There are limits on how much sound sources and sound receivers can be processed depending on the number of rendering and reproduction modules you've instantiated.
      Use ASIO drivers.
  • Can a VA server run on a mobile device, for example on an Android platform?
    • No.
  • I am trying to use a VA binding, but I get a 'module not found' or 'library not found' error.
    • You are missing a dependent shared library (dll on Windows). Make sure to include the dependencies if you copy libraries. If you are a developer, the Dependency Walker is an excellent supporter for solving these problems on Windows platforms. Otherwise consider switching to static linking to avoid this problem with the VA bindings.
  • Can I use SOFA HRTFs in VA?
    • Not directly, but you can convert SOFA HRTF files into OpenDAFF using the ITA-Toolbox for Matlab. Create an itaHRTF and load the SOFA file, then export using ita_write_daff.


    Issue tracker

    Issues are very likely to appear. VA is a prototyping software, and the usage can hardly be foreseen by the developers. However, it is important to identify if the issues you have are usage-related or require a bug fix in the code. If you are insecure, go through the FAQ and discuss with the community first.

    If you have trouble configuring and using VA, there is a whole section about that in the getting started page, which should be carefully read first.

    If you are sure it is a bug that should be fixed, then * in most cases, VA and its rendering or reproduction modules will behave oddly, which usually points to a problem in the core of VA. Also, if you do not know where to file your issue, use the VACore as it is the most active part of development.


    VA community

    The developers of VA can not answer every question due to limited resources. The solution approach is to establish a community of users that help each other to a) minimize the workload for the dev team and b) handle potentially easy-to-solve questions quicker.
    Right now, questions can be asked at stack exchange's sound design group. If there are enough VA questions, a tag va can be created that should be assigned with every question.


    VA has no official support team

    We are very sorry to inform you, that there is no official support team in place. We, the developers of VA, are scientists and are paid for research, not commercial or private support activity. However, if you are willing to start a research alliance or fund a joint project that gives us opportunities to spend time on your ideas, we will be open to discuss your proposal. Please contact the administration of the Institute of Technical Acoustics (ITA), RWTH Aachen University, in this case.