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About

Hello and welcome to my website! This is a non-profit website that I work on in my free time. I hope you like it :)

You can:

- Convert an audio file to another format.

- Extract the audio from a video and download it as an audio file.

- Convert a video to the MKV format.

- Downmix multi-channel audio to stereo.


Codecs / Encoder Information


MP3

This website uses the latest version of the LAME encoder (LAME v3.100) to convert an audio file to MP3. The LAME encoder is considered to be the highest quality encoder for MP3.


AAC

AAC was designed to be the successor to MP3 and is the most common audio codec in MP4 videos. It is also the codec of music downloaded from iTunes. The extension of a raw AAC file is ".aac", and an AAC file wrapped in the MPEG-4 container has the extension ".m4a" (this is the case of music downloaded from iTunes).

There are two AAC encoders to choose from:

QAAC

This uses Apple's AAC encoder, which is supposedly the highest quality AAC encoder. More specifically, QAAC is used, which a command-line encoder frontend based on the Apple encoder. QAAC is an open-source project, and can be found here.

Fraunhofer FDK AAC

Fraunhofer FDK AAC is a high quality AAC encoder which was originally developed for Android. More specify, this website uses fdkaac, which is a command-line encoder frontend for the FDK AAC encoder.


Speex

Speex is a low-bitrate audio codec that was designed for speech. However, it has been obsoleted by Opus which better than Speex in all aspects.


Vorbis

Vorbis has sort of been left in the shadow after the release of Opus, which is essentially its replacement. With that being said, it is a lossy codec that performs well, and compares favourably to MP3 at low bitrates. This website uses the latest version of Aoyumi's Tuned Vorbis (aoTuV), which is aoTuV b6.03. Aoyumi's Tuned Vorbis "improves significantly on Vorbis quality".


Opus

Opus is the talk of the town in world of lossy audio codecs. It is an open-source codec and should be the go-to codec for bitrates under 128kbps. This is because it compares favourably to all of the major lossy codecs at low bitrates. This website uses the latest version of Opus; libopus 1.3.1