测试

来源：互联网发布：神奇公式优化编辑：程序博客网时间：2024/05/21 09:17

1. 60s 转换成mp3的文件大小 15 K，原文件大小 129K 10s的原文件大小是 59K

NSMutableDictionary *recordSettings = [[NSMutableDictionaryalloc] initWithCapacity:0];

[recordSettings setValue :[NSNumbernumberWithInt:kAudioFormatMPEG4AAC]forKey:AVFormatIDKey];//格式

[recordSettings setValue:[NSNumbernumberWithFloat:8000.0] forKey:AVSampleRateKey]; //采样8000次

[recordSettings setValue:[NSNumbernumberWithInt: 1] forKey:AVNumberOfChannelsKey];//声道

[recordSettings setValue :[NSNumbernumberWithInt:8] forKey:AVLinearPCMBitDepthKey];//位深度

[recordSettings setValue :[NSNumbernumberWithBool:NO]forKey:AVLinearPCMIsBigEndianKey];

[recordSettings setValue :[NSNumbernumberWithBool:NO] forKey:AVLinearPCMIsFloatKey];

//Encoder

[recordSettings setValue :[NSNumbernumberWithInt:12000] forKey:AVEncoderBitRateKey];//采样率

[recordSettings setValue :[NSNumbernumberWithInt:8]forKey:AVEncoderBitDepthHintKey];//位深度

[recordSettings setValue :[NSNumbernumberWithInt:8]forKey:AVEncoderBitRatePerChannelKey];//声道采样率

[recordSettings setValue :AVAudioQualityMin forKey:AVEncoderAudioQualityKey];//编码质量