QuickTime Player supports a number of formats, such as QuickTime movie files (MOV), most MPEG-4 files (MP4, M4V, M4A, MP3), MPEG-2, DV Stream, Mjpeg, and some audio files like WAV, AIFF, AAC. However, these formats don't enjoy the fair treating. Among them, MOV, MP4, and M4V are three types of optimal formats. Pretty good all around player, and directly interfaces into the QT player so you can open.avi files in the QT player with the extra QT component. It won't work on all.avi files, though. It's probably always good to have a few different options though - I personally have three different decoders that are QT components (/Library/Quicktime).

Quicktime Player Won't Play Avi Files
Quicktime Player Can't Open Avi Files

AVI or Audio Video Interleave was developed by Microsoft as the file format for its media player application. It is an old container. MOV was developed for Mac OS and QuickTime application by Apple. MOV supports MP4 codecs like H.264 while AVI does not.

On the Internet, where the compatibility demands are high, AVI had become very popular. This format is supported by almost all players, even portable devices like video players and video smart phones. Because of the growing needs of the users of this format, Microsoft abandoned AVI container and launched WMV with newer and more features but for the later version of the Windows Media Player.

The AVI container has no native support for modern MPEG-4 features like B-Frames. Hacks are sometimes used to enable modern MPEG-4 features and subtitles, however, this is the source of playback incompatibilities.

AVI files do not contain pixel aspect ratio information. Microsoft confirms that 'many players, including Windows Media Player, render all AVI files with square pixels. Therefore, the frame appears stretched or squeezed horizontally when the file is played back.'

More modern container formats (such as QuickTime, Matroska, Ogg and MP4) offer more flexibility, however, projects based on the FFmpeg project, including ffdshow, MPlayer, xine, and VLC media player, have solved most problems with viewing AVI format video files.

While the AVI format has been superseded by more advanced formats like MP4, MOV or WMV, people continue to use AVI because of its universal portability. AVI files can be played on almost any computer or device (unless the format has been hacked for supporting MP4).

The QuickTime (.mov) file format functions as a multimedia container file that contains one or more tracks, each of which stores a particular type of data: audio, video, effects, or text (e.g. for subtitles). Each track either contains a digitally-encoded media stream (using a specific codec) or a data reference to the media stream located in another file. Tracks are maintained in a hierarchical data structure consisting of objects called atoms. An atom can be a parent to other atoms or it can contain media or edit data, but it cannot do both.

The ability to contain abstract data references for the media data, and the separation of the media data from the media offsets and the track edit lists means that QuickTime is particularly suited for editing, as it is capable of importing and editing in place (without data copying). Other later-developed media container formats such as Microsoft's Advanced Systems Format or the open source Ogg and Matroska containers lack this abstraction, and require all media data to be rewritten after editing.

You can generally watch AVI videos on a Mac’s QuickTime player without any issues. All you have to do is open Quick Time Player located in the Applications folder and double click on the file. There is no cow level. In fact, most of the latest versions of Quick Time support a wide variety of video formats and codecs. But in some cases, QuickTime may have difficulty playing the AVI file and may display errors like

‘The file.avi is not in a format that QuickTime understands. You may need to install additional software to open this file’.

Why does Quick Time have issues playing certain AVI files? Let’s find out reasons for the same.

When the AVI files are compressed using codecs not compatible with QuickTime
Many DivX files have a .avi extension, but QuickTime is not designed to support DivX codec natively

Due to these reasons, QuickTime Player may have issues playing the AVI file and produce error messages. In order to solve this problem and play your AVI file smoothly, we provide some simple solutions.

Quicktime Player Won't Play Avi Files

1. Download necessary plug-ins

If you want to play the AVI file in Quick Time player, then you can install a plugin called Perian. Perian is a free component that is referred to as a Swiss Army knife for QuickTime player. With Perian installed, you can view various types of video formats that Quick Time Player otherwise doesn’t support. Although Perian is no longer being developed and does not work with QuickTime 10 or above, it can still be used with QuickTime 7 and such.

2. Convert the AVI file to a format compatible with QuickTime player

Converting the AVI file to a file format that is compatible with QuickTime player is the next best solution. The best format you can convert the AVI file to is the MOV format as it is native to Quick Time. To do the conversion, there are many tools out there, but be sure to use a tool that is reliable and trustworthy.

Using an unreliable video converter can damage your AVI file and do more harm than good. Also, remember to have a backup of the original video file before converting just in case.

3. Use a universal media player such as VLC

The VLC media player is considered a Swiss army knife for all kinds of video files. Unless of course, you don’t have a restriction to play the AVI file only in QuickTime, this is the simplest and most effective solution.

So, as a first step, go ahead and install a VLC media player on your Mac device. Then, just open the AVI file that you wish to play in VLC and the file will be played effortlessly.

Quicktime Player Can't Open Avi Files

Repair AVI files

If you are converting an AVI file or any file for that matter to another format, it is important that you use reliable tools. Failing to do so can corrupt your video files and cause damage. This is why we stressed you to make a backup of the original video in Solution 2.

In other situations, compressing AVI files using unconventional methods can also cause damage to your files. In such cases, it is imperative that you repair the file and for this purpose, Remo Repair is the best pick. It is specially designed to repair AVI files no matter what the reason for corruption is. Unreliable conversion tools, unconventional compression techniques and many other cases of corruption can be repaired using this tool.

Another good thing about Remo Repair is that it can be used to repair AVI files on Mac as well as Windows systems.

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Quicktime Player Won't Play Avi Files

Quicktime Player Can't Open Avi Files

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