我使用多种模式(不同的mode, bitrate, samplerate)进行wav to mp3转换,奇怪的是有些模式转换出的mp3声音正常,有些声调细而快,有些粗而慢。不知为何?望高手指教。const
MP3Options: array[0..14] of TMP3Option = (
(Mode: MONO; Bitrate: 16; SampleRate: 11025),
(Mode: MONO; Bitrate: 32; SampleRate: 22050),
(Mode: MONO; Bitrate: 40; SampleRate: 22050),
(Mode: MONO; Bitrate: 48; SampleRate: 22050),
(Mode: MONO; Bitrate: 56; SampleRate: 44100),
(Mode: MONO; Bitrate: 64; SampleRate: 44100),
(Mode: STEREO; Bitrate: 32; SampleRate: 11025),
(Mode: STEREO; Bitrate: 64; SampleRate: 22050),
(Mode: STEREO; Bitrate: 80; SampleRate: 22050),
(Mode: STEREO; Bitrate: 96; SampleRate: 22050),
(Mode: STEREO; Bitrate: 112; SampleRate: 44100),
(Mode: STEREO; Bitrate: 128; SampleRate: 44100),
(Mode: STEREO; Bitrate: 128; SampleRate: 48000),
(Mode: STEREO; Bitrate: 256; SampleRate: 44100),
(Mode: STEREO; Bitrate: 256; SampleRate: 48000)
); LameCoder.Mode := MP3Options[i].Mode;
LameCoder.Bitrate := MP3Options[i].Bitrate;
LameCoder.SampleRate := MP3Options[i].SampleRate;
MP3Options: array[0..14] of TMP3Option = (
(Mode: MONO; Bitrate: 16; SampleRate: 11025),
(Mode: MONO; Bitrate: 32; SampleRate: 22050),
(Mode: MONO; Bitrate: 40; SampleRate: 22050),
(Mode: MONO; Bitrate: 48; SampleRate: 22050),
(Mode: MONO; Bitrate: 56; SampleRate: 44100),
(Mode: MONO; Bitrate: 64; SampleRate: 44100),
(Mode: STEREO; Bitrate: 32; SampleRate: 11025),
(Mode: STEREO; Bitrate: 64; SampleRate: 22050),
(Mode: STEREO; Bitrate: 80; SampleRate: 22050),
(Mode: STEREO; Bitrate: 96; SampleRate: 22050),
(Mode: STEREO; Bitrate: 112; SampleRate: 44100),
(Mode: STEREO; Bitrate: 128; SampleRate: 44100),
(Mode: STEREO; Bitrate: 128; SampleRate: 48000),
(Mode: STEREO; Bitrate: 256; SampleRate: 44100),
(Mode: STEREO; Bitrate: 256; SampleRate: 48000)
); LameCoder.Mode := MP3Options[i].Mode;
LameCoder.Bitrate := MP3Options[i].Bitrate;
LameCoder.SampleRate := MP3Options[i].SampleRate;
Mode: 编码模式 MONO 是单声道 STEREO是立体声
Bitrate: 编码位制波特率 位数越高,每一帧数据占用的字节就越多.
SampleRate: 采样率 数值越大,产生的数据越多,保真率就越高.
只要设置好这些就可以了.
有些声调细而快,是因为采样率太高
有些粗而慢,是因为采样率太低,可与bitrate不匹配.注意:
编码后的播放效果与你的音频源也有关系.音频源如果是.MP3格式转换的.WAV,说明它已经被编码失真了.再次转换效果当然不好.
编码时,要注意以上三个参数的搭配.