No records video bolee 5 minutes in CS: GO, and if the recording is without sound . It does not work Twitch.
Sounds like we would need to investigate the issue further. You've already made a ticket, however sending in logs after doing so would greatly help.
To send logs you just right-click on the Plays.tv taskbar icon, select Help > Feedback, fill out the info and make sure the checkbox is selected. You can also make reference to your current ticket #42521