oCam is a lightweight Windows screen recorder from the Korean developer OhSoft.
Many people install it to capture tutorials, online classes or gameplay, then get stuck on the details: the window has separate Screen Recording and Game Recording tabs, the codec lives behind one button while quality sits in another menu, and when something goes wrong the error messages are not very friendly.
This guide walks through oCam the way the official help pages describe it. We cover where to download it safely, how to frame a recording area, how game capture works, which codec suits your PC, how sound is set, where files are saved, and which hotkeys are set by default.
After that we go through the problems people search for most often, such as a recording that refuses to start, a black video, stutter while recording and huge files. Menu names and the version number can change with updates, so everything here is checked as of November 12, 2026.
Short answer: Game Recording tab for games, a codec that matches your GPU, and MKV for safety
Three settings matter most. First, record games from the Game Recording tab rather than the Screen Recording tab. The official help says game recording supports DirectX 8 through DirectX 12 and OpenGL, and a yellow FPS counter in the top left of the game window means oCam is ready.
Second, choose a codec that fits your hardware. The default MPEG-4 codec is safe on modest PCs, and if you have a supported NVIDIA card (desktop GTX 600 series or newer, laptop GTX 650M or newer) the help pages recommend NVENC H.264 for the smallest frame rate hit in games.
Third, if a game might crash or you might have to force close oCam, pick the MKV container in the Codec menu. OhSoft notes that MP4 files can be left unplayable after an abnormal shutdown, while MKV keeps everything recorded up to that point. If you mainly want to record games and are open to another approach, see our oCam and GomCam alternatives roundup.
How to record with oCam, step by step
- 1Install from the official siteGet oCam from the oCam page on ohsoft.net, the developer's own site. As of November 12, 2026 that is version 550.0, a download of about 9.1MB for Windows 10 and 11. Non commercial personal use is free and the free edition shows ads, including one when you exit. Businesses, organizations, public institutions, schools and PC cafes must buy a license; the paid edition has the same features and simply removes the ads.
- 2Screen recording: set the areaWhen oCam opens you will see a green recording frame. Drag the center icon to move it and the small corner squares to resize it. To capture a single window, use Find target window (F4) from the Resize button. Press Record or F2 and the frame turns red, while the main window shows remaining time, current file size and free disk space.
- 3Game recording: Game Recording tab and F2Click the Game Recording tab at the top and the Resize button disappears. Switch to your game and a yellow FPS counter appears in the top left; press F2 and it turns red to show recording has started. Press F2 again to stop. If the counter never appears or the video comes out black, also read our fullscreen recording black screen fixes.
- 4Choose codec and qualityThe Codec button sets the container (MP4, MKV, MOV, AVI and more) and the video codec. MPEG-4 is the default; pick NVENC H.264 if your NVIDIA card supports it, or Open H.264 if you have CPU headroom. Built in codec quality is set under Tools > Options > Encoding, from Very High down to Very Low, with Very High as the default. NVENC has its own Hardware Encoder Settings inside the Codec menu.
- 5Pick audio and check the fileThe Sound button lets you record system sound only, system sound plus microphone, or no sound. After you stop, click Open and File Explorer opens with the new file selected. Files are named with a prefix plus date and time by default, and you can change the pattern under Tools > Options > Save.
oCam default hotkeys and save folder (as of November 12, 2026)
| Action | Default | Where to change it / notes |
|---|---|---|
| Start or stop recording | F2 | Tools > Options > Hotkeys; untick to disable |
| Pause | Shift+F2 | Skip idle stretches while recording |
| Screenshot | F3 | Works during a recording too |
| Find target window | F4 | Resize menu option that snaps the area to a window |
| Move recording area | Arrow keys (1 px), Ctrl+arrows (bigger steps) | While recording, drag the border instead |
| Resize recording area | Shift+arrows, Shift+Ctrl+arrows | Rough size with the mouse, then fine tune |
| Save folder | This PC > Documents > oCam (Windows 10) | Tools > Options > Save > Save path; the Open button jumps there |
What to check when oCam fails, goes black or stutters
- If recording will not start at all, look at the codec first. OhSoft says NVENC H.264 fails when the graphics card does not support it or runs out of GPU memory, so switch to MPEG-4 and try again.
- Failed to url_fopen or avio_open (error=-13) points to saving. Move the save path to a folder you can write to, such as the Desktop, and if AhnLab V3 or Avast is blocking oCam, add oCam.exe as an exception.
- Error while writing video frame (error=-28) after a while means the save drive is FAT32 and cannot hold files over 4GB. Point the save path at an NTFS drive.
- If the PC gets sluggish while recording, lower frames per second under Tools > Options > Encoding step by step, for example 30 to 25 to 20. If NVENC files are huge, tune 1-PASS VBR and the quantizer range in Hardware Encoder Settings; the background is in our guide to reducing recording file size.
- If an MP4 will not open after a crash, record to MKV from now on, and for files that are already damaged follow our corrupted recording recovery guide.
Want games to record themselves?
oCam is good at grabbing any part of the screen with one hotkey. If clicking the Game Recording tab and remembering F2 every session feels like a chore, DOR is worth a look alongside it.
DOR is a free Windows game recorder: launch a supported game and it detects it and records the whole match automatically, collecting everything in My Clips inside the app. For seven games, including League of Legends, VALORANT and PUBG, it also creates highlight clips from events such as kills.
Anything that is not a game can be captured with screen recording (default hotkey F7), and you can trim the part you want in 16:9, 9:16 or 1:1. See how DOR auto recording works and the League of Legends hub for details.
