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MOV to AAC
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Information about AAC |
|---|
| File extension |
| aac |
| File category |
| Audio |
| Stands for |
| Advanced Audio Coding |
| Developer |
| Bell Labs, Fraunhofer IIS, Dolby Laboratories, LG Electronics, Sony Corporation (Combined Efforts) |
| Overview |
| AAC is the descendant of the MP3 format. It provides better sound quality using a similar bit rate as of MP3. Besides this, it uses lossy data compression but it has high standards of audio quality than of MP3. We can find this format on a number of platforms and Apple's iTunes is one such example that uses it as default audio format. Size of its file is much smaller which is approximately one-tenth of MP3 file. It also neglects the redundant information that is not even processed by the human ear and is often not noticed. Although, this format was introduced as MPEG-2 Part-7, yet, standardization was done by ISO/IEC as a part of the MPEG-2 and MPEG-4 families. It is also termed as MPEG-2 NBC (Non- Backward Compatible) because it is incompatible with MPEG-1 audio formats i.e. MP1, MP2, MP3. |
| Technical description |
| Modified discrete cosine transform(MDCT) algorithm is used by AAC which ensures that it provides high compression efficiency. MPEG-2 PART-7 has three default profiles namely Low Complexity (LC), Main Profile (Main) and Scalable Sample Rate (SSR). These profiles come with Perceptual Noise Substitution which enhances coding efficiency and provides excellent audio quality. Furthermore, it uses Auditory Masking to ignore the surplus information. This codec has come up with advanced features which are not available in the predecessor. These include additional sample rates ranging from 8 to 96 kHz, 48 Channels, better efficiency with a simpler filter bank, higher coding efficiency for stationary signals and higher coding accuracy for transient signals. |
| Links |
| wikipedia.org |
Information about MOV |
|---|
| File extension |
| mov |
| File category |
| Video |
| Stands for |
| MPEG-4 Part-12 |
| Developer |
| Apple |
| Overview |
| An MOV file format is a multimedia container which is used to store videos, text, images, subtitles and audios. Although, it was developed by Apple, yet, it can be used by both platforms i.e. Mac/Macintosh and Windows. Softwares that are meant for video editing especially use this format. To compress files, it uses MPEG-4 Codec. It should be noted that there is great similarity between MOV and MP4 files and they both support Apple’s QuickTime Player. But MP4 is based on international standards that is the main reason it is supported broadly. Additionally, it has the potential to abstract data references for the multimedia data. Also, it separates the media data from its offsets. |
| Technical description |
| MOV is extremely suitable for editing as there is no need to re-write data because it has the ability to import and edit in place. There are different media tracks in which data can code using distinct codecs. The data structure in tracks follow the hierarchy and they consist of atoms. An atom can either represent itself as a parent to other atoms or can have media or can edit the data. The older version of QuickTime supported only viewing of these files but the latest versions like QuickTime Pro both support editing and exporting that can be easily done by the user. ‘Passthrough’ option in this software allows clean exporting of audio and video streams to MP4. This form is an extended form of MPEG-4 PART-12. |
| Links |
| wikipedia.org |
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