| Name | OPUS | MP4 |
| Full name | OPUS - Opus Audio Format | MP4 - MPEG-4 Part 14 |
| File extension | .opus | .mp4, .m4a, .m4p, .m4b, .m4r, .m4v |
| MIME type | audio/opus | video/mp4 |
| Developed by | IETF codec working group | International Organization for Standardization |
| Type of format | Audio | Media container |
| Description | 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. | 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. |
| Technical details | 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. | 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). |
| File conversion | OPUS conversion | MP4 conversion |
| Associated programs | FFmpeg, AIMP, Amarok, cmus, foobar2000, Mpxplay, MusicBee, SMplayer, VLC media player, Winamp | Windows Media Player, RealPlayer, MPlayer, Media Player Classic, VLC Media Player, K-Multimedia Player |
| Wiki | https://en.wikipedia.org/wiki/Opus_(audio_format) | https://en.wikipedia.org/wiki/MPEG-4_Part_14 |
File converter/Audio/Video/Convert to AAC/MP4 converter/ AAC to MP4 or drag and drop file
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MP4 MP3 Converter converts AAC to MP4 and supports more than 100 audio and video files. The software also supports batch conversion. Free Download MP4 MP3 Converter; Install the software by instructions; Launch MP4 MP3 Converter; Choose AAC Files.
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How to convert aac to mp4?
How to convert mp4 to aac?
Step 1
Upload aac-file
Select aac file, which you want to convert, from your computer, Google Drive, Dropbox or drag and drop it on the page.
Step 2
Convert aac to mp4
Select mp4 or any other format, which you want to convert.
Step 3
Download your mp4-file
Wait till your conversion process will be completed and click download converted mp4 file.
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Advanced Audio Coding
| File extension | .aac |
| File category | audio |
| Description | A proprietary format with lossy compression, which have been created as an alternative for MP3 with a higher quality of coding. Overtones out of human perception are being removed. AAC is two times less than MP3, which means 1/10 of CD digital data. The format has been widely used since 1997 as the seventh release of the MPEG-2 family. As hardware players supply it, the format is highly demanded by music fans. It has been widely spread in Apple production and is being used by default in iTunes. |
| Technical details | The format conception is similar to MP3, but it is more advanced. Being able to execute larger compression, it is represented as a separate segment of MPEG-4 standard used to create compact audio files. AAC is highly efficient with variable and continuous bitrate, with a sampling frequency of 8-96 kHz. The current version complies with the standard of ISO/IEC 14496-3. Compression is performed based on an auditory masking effect that provides data reduction with no deterioration for sound quality. |
| Programs | VLC media player Foobar2000 Apple iTunes |
| Developer | Bell Labs, Dolby Laboratories, Sony, Nokia, Coding Technologies |
| MIME type | audio/aac audio/3gpp audio/mp4 audio/mpeg4-generic audio/x-m4a audio/x-m4b audio/mpga |
MPEG-4 Video File
| File extension | .mp4 |
| File category | video |
| Description | The MP4 files (MPEG-4 part 14 files) are the multimedia files used with multiple stations and video players simultaneously. They can store digital audio streams and digital video, and other suitable amounts of data like subtitle tracks. MP4 video format is a widespread file format due to its very own container format. It is also used with multiple platforms such as iTunes, PlayStation, and portable PSP. It is also a popular file format for streaming over the Internet. For instance, YouTube videos have MP4 extension. |
| Technical details | The technical details of MP4 files differ in significant aspects and are unique as well, first released in 2001 under ISO/IEX 14496-1:2001 standards. It uses an AAC encoding to wear off unauthorized users from copying the data. The main purpose is streaming rather than sending video or audio information. MP4 files can be used to store audio streams and text information, subtitles, and still images. At the same time, MPEG format can’t do this. Anyhow the processing of data into MPEG-4 part 14 requires private streams such as the use of hint tracks to include the information. |
| Programs | VLC media player Eltima Elmedia Player Apple QuickTime Player |
| Developer | Moving Picture Experts Group |
| MIME type | audio/mp4 |
FAQ
Firstly, select a aac file you want to convert or drag and drop it. Secondly, select mp4 or any other format you want to convert your file to. Then click convert and wait until your file is converted
Audio conversion usually takes a few seconds. You will convert aac to mp4 very quickly.
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