> its GUI is not clear at all !
No worse than VirtualDub or any other program - it's hard at first, then becomes easy.
Get the PDF Guide (https://obsproject.com/forum/resources/open-broadcaster-software-studio-multiplatform-help-guide-pdf.365/) to help answer basic questions.
> there is only x264
There are GPU h.264 encoders such as NVENC if you have suitable hardware. Output mode must be set to "Advanced" to see them.
You can also select "custom" ffmpeg encoders (see below), but they will be untested by the developers, and therefore likely to have stutter issues etc.
These are some very rough notes on how I have set up OBS Studio for recording.
There are MANY setup guides out there, this is mine. * suggest run as admin (https://www.google.com/search?q=windows+shortcut+run+as+admin)
* new Scene ('+' button); name "Scene 1" (or whatever)
* new Source ('+'); type=Display Capture; name "Display"
(there are other sources available; use this one to start)
* right-click, properties, capture cursor on/off (your preference)
* new Source ('+'); type=Audio Input; source=<speakers>(*); name "Speakers"
(*) (see my notes above re: "What U Hear", etc)
optional multichannel audio:
* new Source; type=Audio Input; source=<headset>; name "Headset Mic"
* Settings button...
* General button:
Enable system tray icon (will show a red dot when recording)
* Stream button:
(don't care)
* Output button:
* Output mode = Advanced
* Recording tab:
Type = standard
(if you choose "custom ffmpeg" YOU ARE ON YOUR OWN)
Path = <a large hard drive, with plenty of free space, dedicated to recording>
Format = mp4 (you can experiment with other options later)
Audio track = <enable one track per audio source>
Encoder = NVENC H.264 if available
Rescale output = unchecked?
Custom muxer settings = "movflags=frag_keyframe min_frag_duration=4000000"
(this makes the file more robust against damage if anything crashes)
Rate control = QCP
CQP = 16 (or whatever)
Keyframe interval = 0 (auto)
Preset = High performance (available choices vary with selected encoder)
Level = Auto
Use two pass = unchecked
GPU =
B-frames =
* Audio tab:
All tracks, bitrate = 256? (preferred AAC bit rate)
* Audio button:
Sample rate = 48kHz? (preferred sample rate 48/44.1)
Channels = stereo (?)
All "devices" DISabled (use audio Sources as explained above)
* Video button:
Base & output resolution = (your screen resolution)
Downscale = Bicubic (but does not apply if above = screes res.)
(you can downscale later by adding a Filter)
Common FPS values = 60? (preferred)
* Hotkeys button:
Minimum, set Start Recording and Stop Recording hotkeys
* Advanced button:
Priority = normal
* Video section:
Renderer = DX11? (preferred)
Color format = NV12
YUV Color space = 709
Range = Partial
* Recording section:
Filename formatting = "OBS-%CCYY-%MM-%DD-%hh-%mm-%ss"
* Stream section:
(don't care)
(end Settings)
* optional screen region:
right click source name, Filters, add ('+'), Crop/Pad
* optional resizing:
right click source name, Filters, add ('+'), Scaling/Aspect Ratio
* (if using multiple audio sources)
Mixer properties: put audio sources on separate "tracks" (audio streams)