I haven't used Afterburner for recording from GP4, but I do use it in other games so I can offer the following advice:
- Choose the highest resolution your system can handle recording at. Ideally record at your game's resolution, however you may have to lower this to keep the game playable and smooth. Make sure the aspect ratio is the same as for your game's resolution.
- Use MJPG compression as the video format - this shouldn't impact performance too badly and gives manageable video file sizes. Quality should be 75-90% depending on how good you want the footage to look.
- Use the same framerate for your video as that which GP4 is set to run at in its graphics settings. If you want to upload videos though, it is best to record at 24/25 or 30 fps, which works best if GP4's framerate is a multiple of this value.
- Choose your speakers as the audio source. Auto Select usually works for this, but if not you'll want to select WASAPI Playback Device if using Windows Vista/7/8 and then choose the correct device (often just called Speakers). It is also possible to record from another audio source e.g. a mic but I haven't tried this.
If you want to upload your footage to YouTube, you'll need to compress/encode the captured video footage (otherwise it's much too large). There is capable free software for this (e.g. Windows Movie Maker) if you don't want to pay for more comprehensive video editing software (I use Sony Vegas but many good apps exist).
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