When I check out a logfile, I typically want to know what the issue is so I can target what could be wrong, but things I always look at are:
1. bitness of OBS (32 or 64 bit)
2. CPU type: is the CPU strong enough to run x264 at the resolution, fps, and preset?
3. if aero is disabled (windows 7 only) it should be enabled in most cases
4. the windows build:
7601 is Windows 7
9600 is Windows 8/8.1
10240 is Windows 10
5 GPU type: is there multiple GPUs? is the GPU D3D10 compliant? is this a laptop with optimus (switchable graphics) also, if its integrated only, even though the CPU specs are fine, might cause slowdown due to GPU scaling and other things the GPU does in OBS
6. the base resolution and downscale
7. the audio format (does this align with windows audio?)
8. Scenes: are there multiple graphics (game) capture?, capture cards or monitor captures?
Each one of the above should have their own scene. Multiple window captures, text, video, graphics is alright.
9. Video encoding: x264 (software/cpu encode), NVENC, VCE, Quicksync
10. fps: 25,30, 45, 48, 60 are typical
11. preset: only for x264 only (default is veryfast)
12.profile: main for streaming, high for local recording
13. keyint: this is typically 2x fps but if its 250, its set to auto (250 is fine for local recording, it needs to be 2x for streaming.
14. CBR: yes for streaming, no for local recording
15. bitrate: 3500 or less for streaming (preferred 2000-2500), higher for local recording
16. buffer: should be same as bitrate for streaming, 0 is only for local recording, which gives unlocked bitrate
17. RTMP server: which ingest, and check out the connection handshake (600 and less is typical), more could mean high traffic to ingest or from ISP
18. Ethernet adapter: should be 1000 for Ethernet and avoid wireless at all cost for streaming
19. After twitch connects, check for connection stalling alerts
20. Total frames duplicated and late frames: should be both below 1% each, if above, lower the resolution downscale, fps or preset
21. number of b/p/total dropped frames: this should all be at 0, if not check network card drivers, cat5, router/modem, ISP or even twitch ingest
22. At the end it shows the last graphic (game) capture, I look for it talking about mutliple hook programs taking either the dx or opengl hook. if it shows the path to the software, consider, disabling it or uninstalling it.