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MPEG-4 Part 14 or MP4 file format, or as it is formally called ISO/IEC 14496-14:2003, is a multimedia container format standard designated as a part of MPEG-4. It is prevalently used to store digital video and digital audio streams, specifically those defined by MPEG, but can also be employed to store other data such as subtitles and still images.

MPEG-1 Audio Layer 3, or MP3 as it is typically called, is a patented digital audio encoding format which uses a kind of lossy data compression. It is a widely used audio format for regular audio storage, as well as a de facto standard of digital audio compression for the transfer and playback of music using digital audio players.

There are instances when converting MP4 to MP3 may be wise, especially if you are using a digital audio player that does not support MP4 playback. To convert from MP3 to MP4 you may either choose to buy software that can do this conversion easily, you may also use free software that can be downloaded from the internet or you may use iTunes to carry out this function. When using iTunes you will have more control over the conversion as it will allow you to set the bit rate and overall sound quality. Below are a list of instructions that will help you to convert from MP4 to MP3 using iTunes.

1.Open the iTunes application.

2.At iTunes, select the song you would like to convert.

3.Go to your iTunes menu bar, select Preferences, alternatively you can press ‘Command’ and ‘comma’ keys, i.e. “?,”

4. At the Preferences window, select the ‘Advanced’ option:

5.At the ‘Advanced’ section, click on the button that says ‘Importing’ and then where it says ‘Import Using’, choose ‘MP3 Encoder’

6.Under Settings, choose ‘Custom’, you can choose any of the options there, but ‘Custom’ settings ensures you set the right bit rate.

7.If you’ve selected ‘Custom’, you will see ta window pop up; ensure that your Stereo Bit Rate and Sample Rate are to your desired settings, it is best to use a setting of 44.1 kHz for the best audio quality. If you are uncertain about custom settings then use the default settings.

8.Close the Preferences window; h before doing so ensure you have checked the correct song.

9.At the iTunes menu, select Advanced -> Convert Selection to MP3 and the conversion would start.

10.Once iTunes has completed the conversion, you will see two songs of the same title.

11.To confirm, select that song title and press the ‘?’ and ‘i’ keys to view the file information, and you should see a new window with the file details.

In the 1990s, the AVI and WMV formats were introduced by Microsoft. Since then both formats have been staples for computer internationally. AVI which stands for Audio Video Interleave, was introduced in the year 1992 and is technically known as a container format. being a container format, AVI can include both video and audio while allowing synchronous playback. AVI files can be found online as music videos, TV shows, streaming videos and even full length motion pictures. On the other hand, WMV stands for Windows Media Video and was developed by Microsoft specifically for streaming. However, WMV can also be saved to a hard drive or disk media for playback with Windows Media Player and other typed of players such as Winamp, DivX and VLC player. The file formats are widely used for two reasons, the first being, they are easily played in media players like Windows Media Player, that come bundled with the Windows operating system. Secondly, they are easy to compress and can be uploaded, downloaded or streamed via the internet. The process of converting AVI file formats to WMV file formats is relatively easy and it only requires conversion software.

Things you will need

Conversion Software

Instructions

Install and Open conversion software on your computer to convert either an AVI or WMV file.

Choose the type of conversion that you would like to achieve.

Load the AVI source file that you would like to convert to WMV. Usually the software will prompt you to browse of quickly select the file from a folder on your computer. A lot of applications will also allow you to drag and drop source files into the application window.

Name the destination file and make certain that it is saved into a specific directory.

Once you’ve completed steps 1 through four, you may choose between additional features. Each software will have its own features, so before using the software, look through the bells and whistles that the software offers.

Once you have made all your selections, you may begin the conversion process. The process should last between a minute to over an hour depending on the file size, the conversion specifics and the computer configuration.

When the conversion process is completed the software will notify you. You will receive an error message at the moment the error took place if a problem occurs. Open the media player of your choice and confirm that the file has been converted correctly.

Do’s

Be careful to select the correct | the relevant | the right} audio and video codecs; WMA for audio and WMV8/9 for a video are select} the best choice.

Be careful to select the relevant video size; usually the original size.

Also, make sure you choose the {right | correct | relevant} bit rate; for decent quality, use at least 128 kbit/s for audio and 768 kbit/s for video.

Keep the frames per second the same as the source file.