WMA 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 | .wma |
|---|---|
| File category | Audio |
| Stands for | Windows Media Audio |
| Developer | Microsoft |
| Overview | It is an audio file format which is proprietary or closed source software. It is available in four different versions. First one is the original WMA codec. This gives competition to the MP3 and it came into existence in 1999. Next is WMA Pro which is an advanced and new codec. It uses lossy compression but provides audios of high resolution. The third is WMA lossless codec and it encodes audio without losing any information. Lastly, there is WMA Voice which is again a lossy compression and it was developed for audios with low bandwidth or low bit rates. Microsoft has developed an advanced systems format which is used by ‘Windows Media Audio' to store encoded audios. Metadata objects like the album, the genre of track and title; etc. can also be added in this codec. The prime use of this extension by users is streaming on the internet. |
| Technical description | Microsoft has various claims about this codec. Firstly, it was alleged that at 64kbps this format will deliver the same quality of audio as of CD. This was rejected at the end. The second claim is that it gives better sound quality than MP3 at the same bit rate. Thirdly, it was professed that this extension provides a similar quality of audio at a lower bit rate than MP3 at a higher bit rate. Apart from this, there is an option available for this container i.e. DRM(Digital rights management) and this option is completely elective. One may or may not choose this choice. A number of software support this format like Windows media player, Microsoft expression encoder; etc. |
| Links | wikipedia.org (opens in new tab - official documentation) |
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