3GP to M4R
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| File extension | .m4r |
|---|---|
| File category | Audio |
| Stands for | MPEG-4 PART 14 for iPhone ringtones |
| Developer | Apple Inc. |
| Overview | M4R is one of the extensions of MPEG-4 Part-14 and it is specially designed by Apple for iPhone ringtones. It is just the relabelling of AAC and M4A. This extension provides an excellent quality of ringtones for iPhones and the size of the ringtone is also small. There are certain steps that one needs to follow for the conversion of any song into this format (iPhone ringtone). Firstly, select any song of 30 seconds and covert it to AAC format using iTunes. Then rename this file using .m4r extension. Finally, by using the iTunes transfer your ringtone file to iPhone. This can be done by connecting your iPhone to the computer and syncing the playlist. Now a user can easily use this ringtone for phone ring, alerts, alarms etc. It should be noted that these files will be supported only by the latest version. Hence, use the current version of iTunes. |
| Technical description | It uses a lossy compression algorithm to encode the ringtones that is same as AAC and MP3 eareensions. But it has the additional feature of auditory masking which means it neglects other sounds which can be detected or recognized while listening or hearing another sound. It only discards the information which is surplus for the human ear. This results in good quality of iPhone ringtones. It takes less storage space without affecting the quality of audio. It is also a segment of MPEG-4 standard and this is stated in the ISO-IEC standard 14495-3. |
| Links | wikipedia.org (opens in new tab - official documentation) |
| File extension | .3gp |
|---|---|
| File category | Video |
| Stands for | Also termed as 3GPP file format |
| Developer | 3rd Generation Partnership Project(3GPP) |
| Overview | 3GP file format is compatible with all the 3G cell phones but it can also be used in some 2G and 4G phones with certain limitations. It is a multimedia container which enables various multiple streams to be embedded into a solo file. It is used both for video and audio files. This format gives an opportunity to the user to edit, modify and transfer files on mobile devices. This aforesaid facility is available online as well. Multimedia messaging service(MMS) and Multimedia Broadcast Multicast Services(MBMS) use this extension for all media files that needed to be sent using cellular or wireless connection. Furthermore, it takes less storage space thus prevents files to consume more disk capacity. |
| Technical description | This extension is based on ISO Base Media file format, MPEG-4 Part 12. It is specially designed for GSM(Global System for Mobile Communications) based phones and tablets. It should be noted that there are few cellular phones that use .mp4 extension to store 3GP video files. Besides this, the smaller bandwidth requirements lead to an easy transmission of files over the Internet. In this type, video streams are stored as MPEG-4 Part-2, H.263 or MPEG-4 Part-10 (AVC/H.263). And AMR-NB, AMR-WB, AMR-WB+, AAC-LC, HE-AAC V1 or HE-AAC V2(This is enhanced AAC PLUS) are used for audio streams. There are various programs linked to this format like QuickTime player, VLC Media Player and Windows Media Player; etc. Apart from this, the Nintendo 3DS also use its technology to play YouTube videos. These files can also be coded and deflated with open-source software. |
| Links | wikipedia.org (opens in new tab - official documentation) |
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