How can I reduce the file size of a video created with UIImagePickerController?

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With AVCaptureSession and AVAssetWriter you can set the compression settings as such:

NSDictionary *settings = @{AVVideoCodecKey:AVVideoCodecH264,
                           AVVideoWidthKey:@(video_width),
                           AVVideoHeightKey:@(video_height),
                           AVVideoCompressionPropertiesKey:
                               @{AVVideoAverageBitRateKey:@(desired_bitrate),
                                 AVVideoProfileLevelKey:AVVideoProfileLevelH264Main31, /* Or whatever profile & level you wish to use */
                                 AVVideoMaxKeyFrameIntervalKey:@(desired_keyframe_interval)}};

AVAssetWriterInput* writer_input = [AVAssetWriterInput assetWriterInputWithMediaType:AVMediaTypeVideo outputSettings:settings];

Edit: I guess if you insist on using the UIImagePicker to create the movie in the first place, you’ll have to use AVAssetReader's copyNextSampleBuffer and AVAssetWriter's appendSampleBuffer methods to do the transcode.

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