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安装好Psychtoolbox后提示以下报错，问题在于GStreamer版本不对。
>> ScreenTestMEX 文件 'D:\MATLAB2020a\toolbox\Psychtoolbox\PsychBasic\MatlabWindowsFilesR2007a\Screen.mexw64' 无效: 找不到指定的模块。出错 ScreenTest (line 8)screens = Screen('Screens'); 使用help GStreamer可以看到一段提示。其中一大堆废话，只有一句有用，就是那个。卸载原来的GStreamer，重新安装这个就行了。
>> help GStreamer GStreamer - Installation instructions for the GStreamer media framework. Psychtoolbox uses the GStreamer multi-media framework for all multi-media related operations. On Windows with Matlab, 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. These functions won't work without a working GStreamer installation on your system (with the exception of video capture from firewire DCAM/IIDC machine vision cameras on Linux and OSX). You will need at least version 1.4 of GStreamer on Linux and OSX and version 1.16 on Windows, but we recommend to use the latest available stable release of the version 1 series. Installation instructions: GNU/Linux: Any decent Linux distribution will include support for 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 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, H.264) 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. MS-Windows and Apple OSX: macOS: You must install 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 legacy Apple CoreText text renderer. If you don't intend to use such functionality then installation of 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 regardless if you want to use multi-media functionality or not, as the Screen() mex file won't work at all without GStreamer installed! You must install at least version 1.16.0 of the MSVC build variant of GStreamer. Here is a FAQ entry on resolving GStreamer problems: NOTE: If GStreamer complains about not being able to find some plugins, e.g., the video playback doesn't work because there is a GStreamer configuration problem, then it can help to delete the 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 file: 'C:\Users\Bob\AppData\Local\Microsoft\Windows\INetCache\gstreamer-1.0\registry.x86_64.bin' Download and install the latest 64-Bit ("x86_64") GStreamer runtimes from: You *must* install the MSVC variants of GStreamer, not the MinGW64 variants! For Apple OSX: Runtime v1.16.0 When the installer asks you to select the components it should install, select a "Custom installation" (instead of a "Basic installation" or such). Then, if you chose a "Custom installation" in the displayed check 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 packages for installation, so restart the installer and repeat installation with the full set of packages. 然后就遇到了下一个问题，同步错误。然后时间关系不研究了。
ARNING: Couldn't compute a reliable estimate of monitor refresh interval! Trouble with VBL syncing?!?----- ! PTB - ERROR: SYNCHRONIZATION FAILURE ! -----One or more internal checks (see Warnings above) indicate that synchronizationof Psychtoolbox to the vertical retrace (VBL) is not working on your setup.This will seriously impair proper stimulus presentation and stimulus presentation timing!Please read 'help SyncTrouble' for information about how to solve or work-around the problem.You can force Psychtoolbox to continue, despite the severe problems, by adding the commandScreen('Preference', 'SkipSyncTests', 1); at the top of your script, if you really know what you are doing. 直接在文件开头加上，不同步就是了。（后果大概是某一个东西取的时间不准确）
Screen('Preference', 'SkipSyncTests', 1); 转载地址：http://ywuzi.baihongyu.com/