想要(Want)更改MP3 文件(MP3 file)的比特率吗？例如，如果您需要减小MP3 文件(MP3 file)的大小，这会很有用。320 kbps的MP3 文件（ (MP3 file)MP3 文件(MP3 file)允许的最高比特率）可以降低到 192 kbps 以显着减小MP3 文件(MP3 file)的大小。
质量会有所下降，但对于大多数使用标准扬声器或耳机的听众来说，这种差异可以忽略不计。如果您是发烧友，那么除了拥有昂贵的音频设备外，您可能永远不会使用MP3 格式(MP3 format)。
您很可能会使用压缩或未压缩的无损格式，例如PCM Audio、WAV、AIFF、FLAC、ALAC或APE。未压缩的PCM 音频文件大约是(PCM audio)CD 质量的(CD quality) MP3 文件(MP3 file)的 10 倍。
MP3 格式(MP3 format)是一种有损格式，这意味着为了保持文件相对较小的大小而牺牲了音频质量。几乎每个网站都会告诉您，除非您对丢失一些音频质量感到满意，否则您永远不应该将无损格式的音频文件(format audio file)转换为MP3 格式。(MP3 format)
几乎所有时间都是如此。唯一可能有意义的是，如果您有像WAV这样的高质量格式的比特率较低的音频文件(bitrate audio file)。例如，将 96 kbps WAV 文件(WAV file)转换为MP3可能有意义，但前提是您选择 192 kbps 或更高的比特率。MP3 文件(MP3 file)的较高比特率将使其保持与WAV 文件(WAV file)相同的质量，即使它是较低的比特率。
您将阅读的第二件事是，您永远不应该将较低比特率的流(bitrate stream)转换为较高比特率的流，并希望(bitrate stream and hope)它听起来更好。您无法通过提高比特率来获得质量。这是完全正确的。如果您尝试提高比特率，您实际上会降低MP3 文件的质量。(MP3 file)
如果您想要比当前更高比特率的MP3，您需要返回源（CD 等）并以全质量提取该音频。然后您可以将该文件转换为更高比特率的MP3 文件(MP3 file)。
您应该知道的最后一件事是，不建议在有损格式之间进行转换，因为您将继续损失质量(loss quality)。但是，可以在无损格式之间进行转换，因为质量保持不变。
因此，既然您了解了将音频文件转换为不同比特率的最佳方法的一些基础知识，那么让我们来谈谈可以帮助我们的程序。请注意，我在VirusTotal上检查了所有这些程序，以确保它们是 100 % clean的。
MP3质量修改器
MP3 Quality Modifier是一款适用于Windows的小型免费软件程序(freeware program)，使用简单且运行良好。它在安装时也不包含任何恶意软件或无用的优惠。
我喜欢这个程序的地方是它甚至不需要任何安装，您只需打开EXE 文件(EXE file)即可运行它。在启动时，它会为您提供一个小欢迎窗口并解释如何使用该程序，这很好。
要开始，只需单击顶部的添加文件(Add Files)或添加文件夹按钮。(Add Folder)该程序仅适用于MP3文件，因此如果您希望将WAV 或 FLAC(WAV or FLAC)文件转换为MP3，请查看下面提到的更多程序。
默认情况下，它选择 130 kbps 的比特率，这大约是中等质量(medium quality)。它还列出了您添加的MP3文件的大小、比特率、模式和采样频率。如前所述，如果您要从较高的比特率转换为较低的比特率，这个程序是有意义的。
您还可以单击预设并从不同的选项中进行选择，例如最佳质量(Best Quality)、高质量( High Quality)、便携(Portable)等。
AmoK MP3 重新编码器
您可以使用的另一个免费编码器是AmoK MP3 ReEncoder，它可以将MP3、FLAC 或 WAV(FLAC or WAV)作为输入。您也可以通过双击EXE 文件(EXE file)来运行该程序。
运行后，您需要下载LAME 编码器(LAME encoder)，这是一个单独的下载。您可以从RareWares 页面(RareWares page)下载最新版本3.95.5 。
请注意，有几个选项。第一个适用于 32 位Windows，第二个适用于 64 位等。如果您需要转换FLAC文件，则需要下载第 4 个说它支持FLAC 和 OGG(FLAC and OGG)输入支持的文件。
下载并解压缩文件后，转到ReEncoder 程序并单击(ReEncoder program and click)文件，(File)然后单击选项(Options)。
在Lame下，单击带有三个点的小框，然后导航到刚刚下载的lame.exe文件的位置。(lame.exe)单击确定(Click OK)，然后确保也选择一个输出目录(Output directory)。
默认配置文件(default profile)的比特率为 192 kbps，但您可以单击配置文件(Profiles)按钮并创建一个新配置文件。
然后，您可以选择比特率(Bitrate)并使用滑块进行调整。选择设置后，单击“添加文件”(Add Files)或“添加文件夹( Add Folder)”按钮添加音频文件。
单击“开始(Start)”按钮，将出现一个小的进度条和窗口(progress bar and window)，显示需要多长时间。
这个程序的唯一问题是我无法让它将WAV 文件(WAV file)转换为MP3 文件(MP3 file)。无论出于何种原因，当我选择WAV 文件(WAV file)时它什么也没做。也许我配置不正确，但是如果您需要从WAV转换为MP3，请查看下面的最后一个程序，该程序有效。
Fre:ac – 免费音频转换器
Fre:ac是另一个开源项目(source project)，它拥有最多的音频格式转换选项。它默认包含多个编码器，因此您不必为WAV、FLAC等下载单独的文件。
安装并运行它后，单击File，然后单击Add，然后单击Add files。
接下来，单击选项(Options)，然后单击常规设置( General Settings)。
这里的主要设置是编码器。默认情况下，它是LAME MP3 Encoder，您可以使用它来将其他音频格式转换为MP3 格式(MP3 format)。但是，如果您想将音频文件转换为FLAC、OGG、WAV 或 BONK(WAV or BONK)，只需选择适当的编码器。
接下来，单击配置编码器( Configure Encoder)以更改LAME MP3 编码器(LAME MP3 encoder)的设置。默认情况下，它将设置为Standard、Fast，这不会为您提供非常高质量的MP3 文件(MP3 file)。
在使用预设( Use preset)下，将其更改为自定义设置(Custom setttings)。现在您可以从VBR、ABR 和 CBR(ABR and CBR)中进行选择。这些标准适用于可变(Variable)、平均(Average)或恒定比特率( Constant Bit Rate)。为了获得最佳质量，您将要使用CBR，这也意味着您的MP3 文件(MP3 file)会更大一些。
然后，您可以将比特率调整到所需的值，也可以调整质量。设置越高，音质(quality sound)越好，但文件越大。
单击确定(Click OK)几次返回主屏幕，然后单击顶部的播放按钮开始(Play button)编码过程(encoding process)。在我的示例中，我使用该程序将 6分 45(min 45) 秒 68 (sec 68) MB WAV 文件(MB WAV file)转换为 12 MB 256 kbps MP3 文件(MP3 file)。如果您使用默认设置，您将获得一个 4 MB 的 MP3 文件(MB MP3 file)。
希望这能让您很好地了解比特率是什么，以及如何根据您拥有的音频文件类型进行调整。如果您有任何问题，请随时发表评论。享受！
3 Ways to Change Bitrate on MP3 Files
Want to change the bitratе on your MP3 files? This can be useful if you nееd to reduce the size of your MP3 files, for example. A MP3 file at 320 kbps, the highest bіtratе allowed for MP3 files, could be reduced to 192 kbps in order to signifiсantly reduce the size of the MP3 file.
There would be a loss of quality, but the difference would be negligible to most listeners using standard speakers or headphones. If you’re an audiophile, then in addition to having expensive audio equipment, you’re probably never going to use the MP3 format anyway.
Most likely you’ll be using a compressed or uncompressed lossless format like PCM Audio, WAV, AIFF, FLAC, ALAC, or APE. An uncompressed PCM audio file is about 10 times bigger than a CD quality MP3 file.
The MP3 format is a lossy format, which means audio quality is sacrificed in order to keep the relatively small size of the files. Pretty much every site will tell you that you should never convert a lossless format audio file to MP3 format unless you are OK with losing some audio quality.
This is true almost all of the time. The only time it might make sense is if you have a lower bitrate audio file in a high quality format like WAV. For example, it might make sense to convert a 96 kbps WAV file to MP3, but only if you choose a bitrate of 192 kbps or higher. The higher bitrate on the MP3 file will allow it to maintain the same quality as the WAV file, even though it is a lower bitrate.
The second thing you’ll read is that you should never convert a lower bitrate stream to a higher bitrate stream and hope that it sounds better. You cannot gain quality by increasing the bitrate. This is exactly correct. You will actually reduce the quality of your MP3 file if you try to convert up the bitrate.
If you want a higher bitrate MP3 than you currently have, you need to go back to the source (CD, etc) and extract that audio at full quality. Then you can convert that file into a higher bitrate MP3 file.
The last thing you should know is that it is not advisable to convert between lossy formats as you will continue to loss quality. It is OK, however, to convert between lossless formats as the quality is retained.
So now that you understand a few of the basics of the best ways to convert audio files to different bitrates, let’s talk about the programs that can help us. Note that I checked all of these programs on VirusTotal to make sure they are 100% clean.
MP3 Quality Modifier
MP3 Quality Modifier is a small freeware program for Windows that is simple to use and works very well. It also doesn’t contain any malware or useless offers when installing it.
What I like about this program is that it doesn’t even require any installation, you can just run it by opening the EXE file. On startup, it gives you a little welcome window and explains how to use the program, which is nice.
To get started, just click on the Add Files or Add Folder buttons at the top. This program only works with MP3 files, so if you are looking to convert a WAV or FLAC file into MP3, check out more of the programs mentioned below.
By default, it picks a bitrate of 130 kbps, which is about medium quality. It also lists out the size, bitrate, modus and sample frequency for the MP3 files you have added. As mentioned, this program make sense if you are converting from a higher to lower bitrate.
You can also click on Presets and choose from different options like Best Quality, High Quality, Portable, etc.
AmoK MP3 ReEncoder
Another free encoder you can use is AmoK MP3 ReEncoder, which can take MP3, FLAC or WAV as inputs. You can also run this program by just double-clicking on the EXE file.
Once you have it running, you need to download the LAME encoder, which is a separate download. You can download the latest version, 3.95.5, from the RareWares page.
Note that there are a couple of options. The first one is for 32-bit Windows, the second is for 64-bit, etc. If you need to convert FLAC files, you need to download the 4th one that says it supports FLAC and OGG input support.
Once you have that downloaded and unzipped the files, go to the ReEncoder program and click on File and then Options.
Under Lame, click on the little box with three dots and then navigate to the location of the lame.exe file you just downloaded. Click OK and then make sure to choose an Output directory also.
The default profile will have a bitrate of 192 kbps, but you can click the Profiles button and create a new profile.
You can then select Bitrate and adjust it using the slider. Once you have the settings chosen, click the Add Files or Add Folder button to add your audio files.
Click the Start button and a little progress bar and window will appear showing you how long it will take.
The only issue with this program was that I was not able to get it to convert a WAV file into an MP3 file. For whatever reason, it just didn’t do anything when I chose a WAV file. Maybe I configured it incorrectly, but if you need to convert from WAV to MP3, check out the last program below, which worked.
Fre:ac – Free Audio Converter
Fre:ac is another open source project that has the most options for converting between audio formats. It includes several encoders by default, so you don’t have to go and download separate files for WAV, FLAC, etc.
Once you install and run it, click on File, then Add and then Add files.
Next, click on Options and click on General Settings.
Here the main setting is the encoder. By default, it is the LAME MP3 Encoder, which you can use to convert other audio formats into MP3 format. However, if you want to convert an audio file to FLAC, OGG, WAV or BONK, just select the appropriate encoder.
Next, click on Configure Encoder to change the settings for the LAME MP3 encoder. By default, it’s going to be set to Standard, Fast, which doesn’t give you a very high quality MP3 file.
Under Use preset, change it to Custom setttings. Now you can pick from VBR, ABR and CBR. These standard for Variable, Average or Constant Bit Rate. For the best quality, you’re going to want to go with CBR, which also means your MP3 file will be a bit larger.
You can then adjust the bitrate to the desired value and also adjust the quality too. The higher the setting, the better quality sound, but the bigger the file.
Click OK a couple of times to get back to the main screen and then click on the Play button at top to start the encoding process. In my example, I converted a 6 min 45 sec 68 MB WAV file to a 12 MB 256 kbps MP3 file using this program. If you go with the default settings, you’ll get a 4 MB MP3 file.
Hopefully, this gives you a good overview of what bitrate is and how you can adjust it depending on what kind of audio file you have. If you have any questions, feel free to comment. Enjoy!
