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OGV to WMA
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Information about WMA |
|---|
| 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 |
Information about OGV |
|---|
| 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 |
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