Convert wav to mp3 file

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If you feel like this example could be improved, you may edit this example here.

Source: The wonderful ffmprovisr

This will convert your WAV files to MP3s.

-i input_file - path and name of the input file

-write_id3v1 1 - This will write metadata to an ID3v1 tag at the head of the file, assuming you’ve embedded metadata into the WAV file.

-id3v2_version 3 - This will write metadata to an ID3v2.3 tag at the tail of the file, assuming you’ve embedded metadata into the WAV file.

-dither_method triangular - Dither makes sure you don’t unnecessarily truncate the dynamic range of your audio.

-out_sample_rate 48k - Sets the audio sampling frequency to 48 kHz. This can be omitted to use the same sampling frequency as the input.

-qscale:a 1 - This sets the encoder to use a constant quality with a variable bitrate of between 190-250kbit/s. If you would prefer to use a constant bitrate, this could be replaced with -b:a 320k to set to the maximum bitrate allowed by the MP3 format. For more detailed discussion on variable vs constant bitrates see here.

output.mp3 - path and name of the output file

A couple notes: About ID3v2.3 tag: ID3v2.3 is better supported than ID3v2.4, FFmpeg’s default ID3v2 setting. About dither methods: FFmpeg comes with a variety of dither algorithms, outlined in the official docs, though some may lead to unintended, drastic digital clipping on some systems.

  • by Elad Gariany <elad@gariany.com>
  • Updated on: April 15, 2022
  • tags: #mp3 
ffmpeg -i input.wav -write_id3v1 1 -id3v2_version 3 -dither_method triangular -out_sample_rate 48k -qscale:a 1 output.mp3
4 comments
Anonymous
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@polygonnedpotato
polygonnedpotatocommentedabout 3 years ago

look sick bro!

@jamescridland
jamescridlandcommented5 months ago

If I understand this website correctly, the dithering command, above, does nothing good when transferring from WAV to MP3. It’s only helpful when changing bit depth of audio.

https://www.waves.com/audio-dithering-what-you-need-to-know

@eladg
eladgcommented5 months ago

@jamescridland
If I understand this website correctly, the dithering command, above, does nothing good when transferring from WAV to MP3. It’s only helpful when changing bit depth of audio.

https://www.waves.com/audio-dithering-what-you-need-to-know

Partially true @jamescridland. Dither is needed when we change sample rate, not bit depth. In the above example it is needed depending on the sample rate of input.wav

From your source:

Dither to the Rescue

The solution is to add dither when you save the file to a lower sampling rate. When dither is added to audio with quantization distortion, it masks it (a process known as "decorrelation"), making it more random and therefore harder for your ears to discern. Instead of sounding harsh and grating, it turns the quantization distortion into a steady, low-level, analog-like hiss.

@jamescridland
jamescridlandcommented5 months ago

Also from the source:

However, if you’re bouncing your mix to a data-compression codec like MP3 or AAC, dithering is not necessary. They’re both formats that introduce artifacts into the signal that dither won’t remedy.

What I'd also say is that this example ought to default to 44.1kHz (the usual samplerate for audio work). But I appreciate that this is sometimes an argument others get rather worked up about!

ko-fi.com/ffmpegbyexample
ko-fi.com/ffmpegbyexample