user13870: Are there any GUI applications (linux or windows) that allow you to apply ffpmeg filters to a video and observe the changes in a preview in real time?

user1871: The Avanti GUI, for Windows, allows you to preview filters. One has to select the FFmpeg Script Editor tab and insert -vfout filtername under [USER_VIDEO_OPTIONS]. Consult the docs for exact syntax. Once entered, click on the 'Preview Filters' button.

user29695: FfmpegGUI seems what you want: https://github.com/RomanSichkaruk/FFmpegGUI

13870: <p>Are there any GUI applications (linux or windows) that allow you to apply ffpmeg filters to a video and observe the changes in a preview in real time?</p>
 1871: <p>The <a href="http://www.videohelp.com/software/Avanti" rel="nofollow noreferrer">Avanti</a> GUI, for Windows, allows you to preview filters. One has to select the <em>FFmpeg Script Editor</em> tab and insert <code>-vfout filtername</code> under <code>[USER_VIDEO_OPTIONS]</code>. Consult the docs for exact syntax. Once entered, click on the 'Preview Filters' button.</p>
 29695: <p>FfmpegGUI seems what you want: <a href="https://github.com/RomanSichkaruk/FFmpegGUI" rel="nofollow noreferrer">https://github.com/RomanSichkaruk/FFmpegGUI</a></p>
