You can change the codec by clicking the codec button in oCam main screen.
 

You will see a list of video containers and video codecs as shown below.

Supported video containers are MP4, MKV, M4V, MOV, WMV, FLV, AVI, TS, VOB.

Supported video codecs include NVIDIA NVENC H.264, Open H.264, MPEG-4, Microsoft MPEG-4 Part 2, MPEG-4, Microsoft MPEG-4 Part 3, Windows Media Video 8 (WMV8), MPEG- 2, MPEG-1, FLV.

Of these, the NVIDIA NVENC H.264 codec has an NVIDIA graphics card and is only supported by graphics cards with certain specifications or higher. Please note that if you select this codec using a graphics card, recording will fail.

The NVIDIA NVENC H.264 codec uses a hardware encoder built into the NVIDIA graphics card so you can record almost no rack when recording games.

In addition to the video codec, the video container also records sound during recording, so the audio codec is also used. Supported audio codecs support AAC, MP3, MP2, WMA, and FLAC.

In addition, it supports GIF. If you select and record a GIF, a GIF file is created instead of being recorded as a video file.