Online audio converter from MP4 to OPUS

#	Result	Source file

To convert audio, follow these steps:

Use the "Local file" or "Online file" buttons to specify how to upload the audio to the server. Use the "local file" if you need to convert a file from your computer, in order to specify a file on the Internet, select "Online file" and in the appeared field paste the link to the file. We do not set any limits on the size of the audio file, but the larger the file, the more time it will take to convert. Just be patient and everything will turn out. You can convert files from audio or video formats. For formats that support tags, the data will also be transferred.
To start the conversion, click the "Convert" button to start the transformation. If the conversion is successful, the file will be available in the "Conversion Results" section. If you just need to download a file, click on the file name. If you want to get other ways to save, then click on the icon to generate a QR code to upload the result to your mobile phone or tablet, and also if you want to save the file in one of the online storage services such as Google Drive or Dropbox.

Please be patient in the conversion process.

Compare MP4 with OPUS

Format introduction	MPEG-4 Part 14 or MP4 is a digital multimedia format most commonly used to store video and audio, but can also be used to store other data such as subtitles and still images. Like most modern container formats, it allows streaming over the Internet.MPEG-4 Part 14 or MP4 is a digital multimedia format most commonly used to store video and audio, but can also be used to store other data such as subtitles and still images. Like most modern container formats, it allows streaming over the Internet.	Opus is a lossy audio coding format developed by Xiph and standardized by the IETF, designed to efficiently code speech and general audio in a single format, while remaining low-latency enough for real-time interactive communication and low-complexity enough for low end ARM3 processors.
Technical details	Most kinds of data can be embedded in MPEG-4 Part 14 files through private streams. A separate hint track is used to include streaming information in the file. The registered codecs for MPEG-4 Part 12-based files are published on the website of MP4 Registration authority (mp4ra.org).	Opus supports constant and variable bitrate encoding from 6 kbit/s to 510 kbit/s, frame sizes from 2.5 ms to 60 ms, and five sampling rates from 8 kHz (with 4 kHz bandwidth) to 48 kHz (with 20 kHz bandwidth, the human hearing range). An Opus stream can support up to 255 audio channels, and it allows channel coupling between channels in groups of two using mid-side coding.
File extension	.mp4, .m4a, .m4p, .m4b, .m4r, .m4v	.opus
MIME	video/mp4	audio/opus
Developed by	International Organization for Standardization	IETF codec working group
Type of format	Media container	Audio
Associated programs	Windows Media Player, RealPlayer, MPlayer, Media Player Classic, VLC Media Player, K-Multimedia Player	FFmpeg, AIMP, Amarok, cmus, foobar2000, Mpxplay, MusicBee, SMplayer, VLC media player, Winamp
Wiki	https://en.wikipedia.org/wiki/MPEG-4_Part_14	https://en.wikipedia.org/wiki/Opus_(audio_format)

If you have a file of the format MP4, then you can convert it to other formats:
MP4 to AVI
MP4 to MPEG
MP4 to WMV
MP4 to MKV
MP4 to WEBM
MP4 to FLV
MP4 to ASF
MP4 to MOV
MP4 to RM
MP4 to VOB
MP4 to MP3
MP4 to WAV
MP4 to OGG
MP4 to WMA
MP4 to AAC
MP4 to FLAC
MP4 to M4A
MP4 to AIFF
MP4 to AMR
MP4 to GIF