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While the official description does acknowledge the use of FFMPEG.EXE by this program unless the license of this program is GPLv3 compatible (there is NO indication that the license for this is GPLv3 compatible) it is still illegal and is pirating the FFMPEG binaries as the ones they use are compiled with GPLv3 license options enabled. They should recompile them to use LGPLv3 options and include a copy of the LGPLv3 license text. There is no license text displayed and requires acceptance during the install process so it’s absolutely NOT GPLv3 licensed or licensed in a compatible manner.
[@TK] I tried GrabTube before recommending it to others. Regarding the FFmpeg concern — GrabTube uses FFmpeg as a standalone external binary (called via command line, not linked as a library). This is the same approach used by VLC, HandBrake, and many other apps that ship with FFmpeg.
The FFmpeg builds bundled are from the official BtbN/FFmpeg-Builds repo on GitHub. Since GrabTube calls FFmpeg as a separate process rather than linking it into the application code, this is generally considered compliant under GPL terms.
That said, you make a fair point about including the license text in the installation. I’ve passed the feedback to the developer — adding a copy of the GPL/LGPL license files in the app directory would be good practice for full compliance. Hopefully they address it in the next update.
