Psychtoolbox uses the [GStreamer](GStreamer) multi-media framework for all multi-media
related operations. On MS-Windows and macOS with Matlab, [GStreamer](GStreamer) is also
needed for high quality text rendering via Screen(‘DrawText’).
All movie playback, movie creation, video capture and video recording
operations are based on [GStreamer](GStreamer). These functions won’t work without a
working [GStreamer](GStreamer) installation on your system (with the exception of
video capture from firewire and USB-Vision DCAM/IIDC machine vision
cameras on Linux, where high-performance multi-camera capture works via
libdc1394, see ‘help VideoCaptureDC1394’, and [GStreamer](GStreamer) is only needed
for video recording, not live capture).
You will need at least version 1.8 of [GStreamer](GStreamer) on Linux, and at least
version 1.18 on Windows and macOS, but we recommend to use the latest
stable release of the version 1 series tested by us (see below). For limited HDR
playback support on Linux, you will need at least [GStreamer](GStreamer) 1.16 + some
modifications to your playback scripts. For full HDR playback support on
Linux, just as on Windows, you will need at least version 1.18. HDR
playback is not yet supported on macOS due to macOS operating system
deficiencies - an insufficiently advanced OpenGL implementation.
Any decent Linux distribution will include support for [GStreamer](GStreamer)-1 in its
package management system, so you can easily install it via the software
management tools of your system. If you install PTB via NeuroDebian, then
most [GStreamer](GStreamer) packages will get automatically installed, with the
possible exception of some optional packages with potential license or
patent restrictions, so read on.
You may need to install those extra plugin packages to play back all
common audio and video file formats like MP3 and MP4. Video or movie
recording with high quality (DivX may also require recent
versions of additional plugin packages which contain support for these
formats. These may not installed by default due to licensing and patent
clauses in place for some territories on this planet. You may want to
specifically add them to your system depending on your format needs.
An easy test is to run SimpleMovieDemo. If it fails or only plays sound,
but not video, then some of the plugins are missing, e.g., the important
“gst-libav” plugins. For basic HDR playback support, Ubuntu 20.04 LTS
(and maybe 18.04 LTS - untested) would suffice. For full HDR playback
support, you would need Ubuntu 20.10, or some 3rd party provided
[GStreamer](GStreamer) 1.18+ packages, or packages built from source.
MS-Windows and Apple OSX:
macOS: You must install [GStreamer](GStreamer) if you want to use multi-media functions or
if you want to use the high-quality text renderer with Matlab, which provides
consistent, fast, high-quality text rendering, instead of the lower quality,
officially unsupported, legacy Apple CoreText text renderer.
If you don’t intend to use such functionality then installation of [GStreamer](GStreamer)
is optional on macOS. Screen will work normally, but abort with an error
message if you try to use any multi-media functions.
Windows: You must install [GStreamer](GStreamer) regardless if you want to use multi-media
functionality or not, as the Screen() mex file won’t work at all without
[GStreamer](GStreamer) installed! You must install at least version 1.18.0 of the MSVC
variant of [GStreamer](GStreamer).
Here is a FAQ entry on resolving [GStreamer](GStreamer) problems:
NOTE: If [GStreamer](GStreamer) complains about not being able to find some plugins,
e.g., the video playback doesn’t work because there is a [GStreamer](GStreamer)
configuration problem, then it can help to delete the [GStreamer](GStreamer) plugin
registry to force a rebuild of that database. E.g., under Windows-10, if
your login user name would be Bob, you would probably have to delete the
Download and install the latest 64-Bit (“x86_64”) [GStreamer](GStreamer) runtimes from:
For MS-Windows: 64-Bit Intel MSVC runtime v1.18.5 for use with 64-Bit Matlab/Octave.
For Apple macOS: Runtime v1.18.5
When the installer asks you to select the components it should install,
select a “Full installation” or “Complete installation”, or if those
options do not exist then select a “Custom installation” (instead of a
“Basic installation” or such). Then, if you chose a “Custom installation”
in the displayed list of packages to install, select *all* components
manually, if you want support for all video formats and all
functionality. Without this, many popular video formats like H264 video
will not play at all, or video recording / video capture and similar
functions may not work. In fact, even our own demos, e.g.,
SimpleMovieDemo *will fail* if you don’t have all codecs installed! -> If
SimpleMovieDemo doesn’t work, then the most likely cause is that you
didn’t select all [GStreamer](GStreamer) packages for installation, so restart the
installer and repeat installation with the full set of packages.