OGV 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 | .ogv |
|---|---|
| File category | Video |
| Stands for | Ogg Video File |
| Developer | Xiph.org |
| Overview | OGV is a free and an open container format for digital media(Audio, Video and text). It is unpatented software and can be used by users free of cost. It compresses the files using lossy compression and discards the redundant information which human ear incapable to process. It is used especially for online streaming. Furthermore, this format is also good for data manipulation and it is standardized by OGG Vorbis. This format is a container format used for Audio, Video and metadata files. For compressing of files, it uses Vorbis Compression Technology. The recorded content can be played using different software like VideoLan VLC Media player and Helix player; etc. |
| Technical description | An OGV file can have separate unrestricted open-source codecs for varied media types like audio, video, text. Theora and DivX are some examples. It supports variable bit rate and based on Discrete cosine transform (DCT) compression pattern. To compress or encode videos it uses Chroma subsampling (Due to low acuity for colours by humans, it uses less resolution to encode images),block-based motion compensation and an 8-by-8 DCT block. The pixels in it are grouped together in various structures- blocks, super blocks and macroblocks. Videos on the web pages can be played using HTML coding i.e. HTML5< video > tag. Although these files have different source code, yet, the videos in this format are often addressed as OGG files in HTML source code. In addition to this, a DirectShow codec pack is provided by the developers so that this format can be used both as open-source and for commercial applications as well. |
| Links | wikipedia.org (opens in new tab - official documentation) |
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