SmoothVideo Project — Using mpv with SVP on Windows 11 yields "No active playback"

Re: Using mpv with SVP on Windows 11 yields "No active playback"

null@example.com (dawkinscm) — Mon, 16 Feb 2026 09:35:03 +0000

I remove that script on every re-install. I already have an mpv thumbnail process running with the main process. So adding this extra process just makes mpv very unstable.

Re: Using mpv with SVP on Windows 11 yields "No active playback"

null@example.com (abraxas) — Mon, 16 Feb 2026 00:28:52 +0000

Oh man, thank you so much! I've also had the problem lately that SVP couldn't "find" the video playing in mpv (in my case with Plex Media Player). And it wasn't reproducible: Sometimes it worked—and sometimes (more often) it didn't.

I removed the script and it's been working ever since—every time.

Re: Using mpv with SVP on Windows 11 yields "No active playback"

null@example.com (Chainik) — Mon, 17 Mar 2025 09:45:02 +0000

can't reproduce

Using mpv with SVP on Windows 11 yields "No active playback"

null@example.com (shirepirate) — Sun, 16 Mar 2025 21:43:54 +0000

This topic is only to help others searching for a solution to something that gave me a headache for hours.

Issue one was launching SVP would quickly cause it to close again, and issue two was launching mpv either by associating filetypes with SVP in Windows or by using SVP's "Open file via mpv" menu option
both yielded "no active playback" as mpv was not recognized when opened. I reinstalled so many times and messed around with administrator permissions, compatibility modes, mpv's configs, etc.

Both issues would be present at different times and disappear at times.

Occasionally it would work randomly and recognized mpv then upon closing the video player and opening it again it would not work under the exact same circumstances (yes, that is as maddening as it sounds).

The only thing that fixed it was getting rid of mpvSockets.lua

Delete the entire "scripts" folder within C:\Program Files (x86)\SVP 4\mpv64 that should contain mpvSockets.lua

After that, it consistently recognized mpv again and would launch SVP every single time no matter what version of mpv i put in C:\Program Files (x86)\SVP 4\mpv64

For good measure, make sure that the following line is also in your mpv.conf:

input-ipc-server=mpvpipe

make sure that line is in mpv.conf both in C:\Program Files (x86)\SVP 4\mpv64 as well as %AppData%\mpv
(to access the latter just paste it into the Windows Explorer address bar, and if there is no mpv.conf file there then don't worry about creating one).