Video / Performance issue

[VinceBarns]

In my tests, I have very delayed responses after key presses (up to 5s). I suspect the video encoding demands a lot of system resources. So I changed the video frame rate in Decoder.py from 60 to 25fps. However, mpv forces 60fps at startup, no matter what I enter. I get the following system messages before the video window opens.

exception: 'AudioData' object has no attribute 'data' [warn] lavf: This format is marked by FFmpeg as having no timestamps! [warn] lavf: FFmpeg will likely make up its own broken timestamps. For [warn] lavf: video streams you can correct this with: [warn] lavf: --no-correct-pts --fps=VALUE [warn] lavf: with VALUE being the real framerate of the stream. You can [warn] lavf: expect seeking and buffering estimation to be generally [warn] lavf: broken as well. [info] cplayer: (+) Video --vid=1 (h264 800x600 25.000fps) [warn] vo/gpu/opengl: Suspected software renderer or indirect context. libEGL warning: DRI2: failed to authenticate [warn] vo/gpu/opengl: Suspected software renderer or indirect context. [warn] vo/gpu/opengl: Suspected software renderer or indirect context. error: XDG_RUNTIME_DIR not set in the environment. Failed to open VDPAU backend libvdpau_nvidia.so: cannot open shared object file: No such file or directory [error] vo/vdpau: Error when calling vdp_device_create_x11: 1 [error] vo/xv: No Xvideo support found. [info] vo/sdl: Using opengl [info] vd: FPS forced to 60.000. [info] vd: Use --no-correct-pts to force FPS based timing. [warn] vd: No video PTS! Making something up. Using 60.000000 FPS. [info] cplayer: VO: [sdl] 800x600 yuv420p [warn] vd: No video PTS! Making something up. Using 60.000000 FPS. [warn] vd: Ignoring further missing PTS warnings.