The software is never updated so something else changed and i cannot figure out what.
You may try to install older version of OBS from the time where all worked OK for you. Or even try OBS in portable mode. For portable mode, please read after the "If it is was not clear" words:
https://obsproject.com/forum/thread...»-when-opening-app-settings.82157/post-346499 or in the Help:
https://obsproject.com/kb/portable-mode
Official releases of OBS for Windows uses next FFmpeg libs (only popular versions listed, x64):
v
31.0.3 --> Based on FFmpeg 7.0.2 "Dijkstra". Includes: avcodec-61.dll (61.3.100.0), avdevice-61.dll (61.1.100.0), avfilter-10.dll (10.1.100.0), avformat-61.dll (61.1.100.0), avutil-59.dll (59.8.100.0), swresample-5.dll (5.1.100.0), swscale-8.dll (8.1.100.0).
v
30.2.3 --> Based on FFmpeg 7.0.2 "Dijkstra". Includes: avcodec-61.dll (61.3.100.0), avdevice-61.dll (61.1.100.0), avfilter-10.dll (10.1.100.0), avformat-61.dll (61.1.100.0), avutil-59.dll (59.8.100.0), swresample-5.dll (5.1.100.0), swscale-8.dll (8.1.100.0)
{changes}
v
30.1.2 --> Based on FFmpeg 6.1.2 "Heaviside". Includes: avcodec-60.dll (60.31.102.0), avdevice-60.dll (60.3.100.0), avfilter-9.dll (9.12.100.0), avformat-60.dll (60.16.100.0), avutil-58.dll (58.29.100.0), swresample-4.dll (4.12.100.0), swscale-7.dll (7.5.100.0)
{changes}
v
30.0.2 --> Based on FFmpeg 6.0.1 "Von Neumann". Includes: avcodec-60.dll (60.3.100.0), avdevice-60.dll (60.1.100.0), avfilter-9.dll (9.3.100.0), avformat-60.dll (60.3.100.0), avutil-58.dll (58.2.100.0), swresample-4.dll (4.10.100.0), swscale-7.dll (7.1.100.0)
v
29.1.3 --> Based on FFmpeg 6.0.1 "Von Neumann". Includes: avcodec-60.dll (60.3.100.0), avdevice-60.dll (60.1.100.0), avfilter-9.dll (9.3.100.0), avformat-60.dll (60.3.100.0), avutil-58.dll (58.2.100.0), swresample-4.dll (4.10.100.0), swscale-7.dll (7.1.100.0)
{changes}
v
29.0.2 --> Based on FFmpeg 5.1.6 "Riemann". Includes: avcodec-59.dll (59.37.100.0), avdevice-59.dll (59.7.100.0), avfilter-8.dll (8.44.100.0), avformat-59.dll (59.27.100.0), avutil-57.dll (57.28.100.0), swresample-4.dll (4.7.100.0), swscale-6.dll (6.7.100.0)
{changes}
v
28.1.2 --> Based on FFmpeg 5.0.3 "Lorentz". Includes: avcodec-59.dll (59.18.100.0), avdevice-59.dll (59.4.100.0), avfilter-8.dll (8.24.100.0), avformat-59.dll (59.16.100.0), avutil-57.dll (57.17.100.0), swresample-4.dll (4.3.100.0), swscale-6.dll (6.4.100.0)
v
28.0.3 --> Based on FFmpeg 5.0.3 "Lorentz". Includes: avcodec-59.dll (59.18.100.0), avdevice-59.dll (59.4.100.0), avfilter-8.dll (8.24.100.0), avformat-59.dll (59.16.100.0), avutil-57.dll (57.17.100.0), swresample-4.dll (4.3.100.0), swscale-6.dll (6.4.100.0)
{changes}
v
27.2.4 --> Based on FFmpeg 4.4.5 "Rao". Includes: avcodec-58.dll (58.134.100.0), avdevice-58.dll (58.13.100.0), avfilter-7.dll (7.110.100.0), avformat-58.dll (58.76.100.0), avutil-56.dll (56.70.100.0), swresample-3.dll (3.9.100.0), swscale-5.dll (5.9.100.0)
{changes}
v
27.1.3 --> Based on FFmpeg 4.2.10 "Ada". Includes: avcodec-58.dll (58.54.100.0), avdevice-58.dll (58.8.100.0), avfilter-7.dll (7.57.100.0), avformat-58.dll (58.29.100.0), avutil-56.dll (56.31.100.0), swresample-3.dll (3.5.100.0), swscale-5.dll (5.5.100.0)
v
27.0.1 --> Based on FFmpeg 4.2.10 "Ada". Includes: avcodec-58.dll (58.54.100.0), avdevice-58.dll (58.8.100.0), avfilter-7.dll (7.57.100.0), avformat-58.dll (58.29.100.0), avutil-56.dll (56.31.100.0), swresample-3.dll (3.5.100.0), swscale-5.dll (5.5.100.0)
v
26.1.1 --> Based on FFmpeg 4.2.10 "Ada". Includes: avcodec-58.dll (58.54.100.0), avdevice-58.dll (58.8.100.0), avfilter-7.dll (7.57.100.0), avformat-58.dll (58.29.100.0), avutil-56.dll (56.31.100.0), swresample-3.dll (3.5.100.0), swscale-5.dll (5.5.100.0)