以下是使用AWS SDK for Python（Boto3）将肖像视频转换为横向格式的示例代码：

import boto3

def convert_portrait_to_landscape(input_bucket, input_key, output_bucket, output_key):
    mediaconvert_client = boto3.client('mediaconvert', region_name='us-west-2')

    # 创建MediaConvert作业
    response = mediaconvert_client.create_job(
        Role='arn:aws:iam::123456789012:role/MediaConvertRole',
        Settings={
            'OutputGroups': [
                {
                    'Name': 'File Group',
                    'Outputs': [
                        {
                            'OutputSettings': {
                                'VideoDescription': {
                                    'ScalingBehavior': 'DEFAULT',
                                    'TimecodeInsertion': 'DISABLED',
                                    'AntiAlias': 'ENABLED',
                                    'Sharpness': 50,
                                    'CodecSettings': {
                                        'Codec': 'H_264',
                                        'H264Settings': {
                                            'InterlaceMode': 'PROGRESSIVE',
                                            'NumberReferenceFrames': 3,
                                            'Syntax': 'DEFAULT',
                                            'Softness': 0,
                                            'GopClosedCadence': 1,
                                            'GopSize': 90,
                                            'Slices': 1,
                                            'GopBReference': 'DISABLED',
                                            'SlowPal': 'DISABLED',
                                            'SpatialAdaptiveQuantization': 'ENABLED',
                                            'TemporalAdaptiveQuantization': 'ENABLED',
                                            'FlickerAdaptiveQuantization': 'DISABLED',
                                            'EntropyEncoding': 'CABAC',
                                            'Bitrate': 5000000,
                                            'FramerateControl': 'SPECIFIED',
                                            'RateControlMode': 'CBR',
                                            'CodecProfile': 'MAIN',
                                            'Telecine': 'NONE',
                                            'MinIInterval': 0,
                                            'AdaptiveQuantization': 'HIGH',
                                            'CodecLevel': 'AUTO',
                                            'FieldEncoding': 'PAFF',
                                            'SceneChangeDetect': 'ENABLED',
                                            'QualityTuningLevel': 'SINGLE_PASS',
                                            'FramerateConversionAlgorithm': 'DUPLICATE_DROP',
                                            'UnregisteredSeiTimecode': 'DISABLED',
                                            'GopSizeUnits': 'FRAMES',
                                            'ParControl': 'SPECIFIED',
                                            'NumberBFramesBetweenReferenceFrames': 2,
                                            'RepeatPps': 'DISABLED',
                                            'DynamicSubGop': 'STATIC'
                                        }
                                    },
                                    'AfdSignaling': 'NONE',
                                    'DropFrameTimecode': 'ENABLED',
                                    'RespondToAfd': 'NONE',
                                    'ColorMetadata': 'INSERT'
                                },
                                'OutputSettings': {
                                    'HlsOutputSettings': {
                                        'HlsSettings': {
                                            'AudioGroupId': 'program_audio',
                                            'AudioOnlyContainer': 'AUTOMATIC',
                                            'IvInManifest': 'INCLUDE',
                                            'IvSource': 'FOLLOWS_SEGMENT_NUMBER',
                                            'KeepSegments': 21,
                                            'KeyProviderSettings': {
                                                'StaticKeyProviderSettings': {
                                                    'KeyFormat': 'identity',
                                                    'StaticKeyValue': 'your_static_key'
                                                }
                                            },
                                            'SegmentLength': 10,
                                            'SegmentationMode': 'USE_SEGMENT_DURATION',
                                            'SegmentsPerSubdirectory': 100,
                                            'StreamInfResolution': 'INCLUDE',
                                            'TimedMetadataId3Frame': 'PRIV',
                                            'TimedMetadataId3Period': 10,
                                            'TsFileMode': 'SEGMENTED_FILES',
                                            'CodecSpecification': 'RFC_4281'
                                        }
                                    }
                                },
                                'ContainerSettings': {
                                    'Container': 'MP4',
                                    'Mp4Settings': {
                                        'CslgAtom': 'INCLUDE',
                                        'FreeSpaceBox': 'EXCLUDE',
                                        'MoovPlacement': 'PROGRESSIVE_DOWNLOAD'
                                    }
                                },
                                'Extension': 'mp4'
                            },
                            'Preset': 'Custom'
                        }
                    ],
                    'OutputGroupSettings': {
                        'Type': 'FILE_GROUP_SETTINGS',
                        'FileGroupSettings': {
                            'Destination': f's3://{output_bucket}/{output_key}'
                        }
                    }
                }
            ],
            'Inputs': [
                {
                    'AudioSelectors': {
                        'Audio Selector 1': {
                            'Offset': 0,
                            'DefaultSelection': 'DEFAULT',
                            'ProgramSelection': 1
                        }
                    },
                    'VideoSelector': {
                        'ColorSpace': 'FOLLOW',
                        'Rotate': 'DEGREE_0',
                        'AlphaBehavior': 'DISCARD'
                    },
                    'FileInput': f's3://{input_bucket}/{input_key}'
                }
            ]
        }