Step 2 The user then needs to download the Perian i.e. The Swiss Army knife for the QuickTime player. Step 3 As the last step the QuickTime and all the related services are to be restarted. A complete system restart is recommended to get out of the issue and to finish the process in full. Solution 1: Convert AVI to QuickTime. The QuickTime web browser plug-in is no longer installed by default and is removed if you have a previous version of QuickTime on your PC. If you still need this legacy plug-in, you can add it back using the custom setup option in the installer. QuickTime 7 is for use with Windows Vista or Windows 7. AVI is also supported by the player but still some AVI files can’t be played directly using the basic free QuickTime player. QuickTime Pro comes with a feature to convert AVI to QuickTime MOV. However, you need a QuickTime Pro license key in order to get the pro features, which come with a cost.

My QuickTime player is not playing .avi files and says I need a codec. I am not able to play any .avi files on QuickTime. How could I fix this because I want to play these files with QuickTime?

Playing AVI files is one of the biggest worries for a Mac user. None of the four major Indeo codecs that are required to decode AVI files have been integrated into QuickTime. In some cases, even if the required codecs are available, the AVI video file does not play due to corruption. So, before we get to know how to play AVI files on Mac or how to fix AVI files that are not playing on Mac, let’s get a quick look at Audio Video Interleave (AVI) format.

Image Source: support.apple.com

Why AVI Files don’t Play on Mac?

Just like any other media player, QuickTime on Mac also examines both the audio and video codecs within the video file whenever you open any file on Mac. If the codecs are not used by the media player it won’t play the video. QuickTime media player does not recognize the Cinepak and ALaw 2:1 codecs used in the AVI video file format. And as a result, when you try to play AVI files in QuickTime, the player doesn’t play the video.

What is an AVI file?

The full form of AVI is Audio Video Interleave. Like any video file format, AVI is a container format that defines how video data is packed into a file. Unlike other video formats, it does not predefine or specify the protocol or procedure involved while recording or creating a file. As an AVI file structure has the organizational format of streams and stream data, it is defined by two lists namely List Chunk and Index Chunk.

List Chunk: The list chunk has metadata, the size of the file, frame rates, and audio/video information.

Index Chunk: The index chunk is responsible for saving the locations of data within the container.

Note: If any of these crucial chunks are missing in your AVI video file, then your AVI file will not play.

What is a Codec?

A codec that is short for compressor and decompressor is responsible for decoding the video and audio tracks that have been encoded or packed in the .avi file.

It is to be noted that an AVI file or any video file does not come with codecs. Codecs are a part of the video player package like QuickTime.

However, if the codec used to encode the AVI file is not available in the QuickTime player, then your AVI file will not play. Thus, you can expand the codec library of the player by downloading the specific codec required to play the AVI video file.

Problems Associated With Running AVI on Mac Using QuickTime

When an AVI file is opened using QuickTime player, it scans the file to see which codecs have been used to encode the data in the container/AVI file.

The AVI format video will play as expected if the video and audio in the codec are compressed using a codec that exists in the QuickTime package. Nevertheless, problems arise while playing AVI files on Mac when the codec does not exist in the library and leads to an unplayable AVI file on Mac. The file may also refuse to play if the AVI file is corrupt. Fix corrupt AVI files on Mac before trying any workaround.

Unplayable AVI Files Return The Following Errors:

• “QuickTime is missing the software needed to perform this operation. Unfortunately, it is not available on the QuickTime server”
• 'You may experience problems playing a video track in 'file.avi' because the required compressor could not be found”

Additionally, the latest version QuickTime X does not have a few major codecs like Indeo or native DivX support and you might end up with the question “How to play unplayable AVI file on Mac?”.

Now that you have understood the complications associated with AVI files that are unplayable on Mac, the following workarounds mentioned below have been provided to help you fix if Mac or MacBook not playing a video.

Methods to Fix Unplayable AVI files on Mac

1. Find the Right Codec to Play the AVI File on QuickTime:

Find the codec used to encode the file using QuickTime by opening the file using QuickTime and select the Show Movie Info option from the Window menu.

The video file information is listed, and you will be able to find codec information after format properties. Check if the QuickTime version supports the codec that is listed in the video properties.

Check on the QuickTime support site if the codec is supported by the player if you don’t find the codec preinstalled with QuickTime. If you don’t find the respective codec or if it is an unsupportive codec, then your AVI video won’t play. In case it is supported then you can go ahead and install the codec after downloading it from the author or the publisher’s site.

Note: Download the codec from genuine and trusted sources to avoid compromising your system security.

2. Download and Install Standardized Video Encoders

There are two major industry-standard codecs for Mac that can extend the playback capabilities. The following codecs have been referred to as the most preferred codecs that enable you to open .avi files on Mac:

• Install 3ivx D4 codec:
  This codec enables greater video quality at lower file size values up to fifty percent when compared to the MPEG-4 standard designed by Apple. This decoder increases the efficiency of the video storage and transmission of files that are rendered too large. It is an integration of a huge set of video and audio codecs that allow playback of almost all the AVI files with AAC audio and video of MPEG-4. You can fix your unplayable AVI file by installing 3ivx D4 on your Mac. Further, there is no need to download any other components like plug-ins to play the AVI file unless a proprietary codec is used to encode the file.

• Install DivX for Mac free codec to fix AVI files in Quick time:
  While you can play the majority of AVI files after you install this free codec for Mac, its major disadvantage is that the audio sometimes might be distorted or only the video is played. For this reason, the DivX codec for Mac is a secondary option when compared to 3ivx D4 codec.

Note: Only one among the above two codecs are to be used at once as they share the same set of library files to decode the video. Hence it is recommended to install only one codec to avoid malfunction of the QuickTime player.

3. Use an Alternate player to Play AVI files on Mac:

VLC or Video LAN Client is a cross-platform media player that supports a wide variety of AVI video and audio codecs. Therefore, choosing VLC as an alternative media player to play the unplayable AVI file on Quick Time is one of the easiest ways.
Because of its large library of free encoding and decoding libraries, you will no longer need any additional codec download or proprietary plug-ins.

4. Play AVI Files By Converting Into QuickTime Supported MOV Files:

Another workaround to fix the unplayable AVI video on Mac is to convert the AVI file into a QuickTime supported file format like MOV.
Post conversion, the file will be playable on Mac. However, most of the converters break the index of the AVI file while conversion, this method is least recommended. Lastly, if the converted video file stops playing halfway try AVI index repair on Mac.

Note: Have a copy of your AVI file before converting them to any other compatible format as your AVI file might get corrupt due to improper conversion and leads to permanent inaccessible AVI files.

AVI Still Not Playing In Mac?

If the AVI video file remains unplayable even after getting the correct codecs, using the compatible player, or converting to MOV, it is probably because the video file is corrupt. The only solution to this is to try an AVI video repair software. Choose a professional AVI video repair tool like Remo AVI Repair.

Remo Repair AVI fixes and works on a duplicate version of your original AVI file to prevent modification on the original file. The self-explanatory interface helps you to fix the video in just 3 clicks. Download the Remo Repair AVI tool now to fix your unplayable video and preview it for free before saving.

Remo Repair AVI Can Also:

• Repair AVI files that are corrupted
• Repair AVI files if their index is corrupted
• Repairs AVI files if there is no audio or playing only audio in the video file

Can Quicktime Open Avi Files

Conclusion:

With the mentioned free workarounds or by using the above-mentioned AVI repair tool, you must have fixed your unplayable AVI videos on Mac. However, you can always make use of Remo Software’s technical assistance team as they will guide you with the repairing process of the software if needed.

AVI is a very popular video format which is widely used today. However, many QuickTime users just realized that it's always not easy to play AVI files with QuickTime player, especially when you have upgraded to the latest OS X 10.11 El Capitan. What's the matter? Why can't QuickTime play AVI videos? Just read on to find the reason and 3 possible solutions to solve your problems without any trouble.

An AVI is a free and open source container format. It can hold different types and unlimited number of video, audio, picture or subtitle tracks in one file. If you can't play AVI with QuickTime in Mac OS X, it's probably the video or audio codec problem. Frankly, there are a lot of options to help you play an AVI file in the Mac OS X (EI Capitan and Yosemite included), here are some solutions:

Solution 1: Convert AVI in Mac OS X

If you have a lot of AVI files and want to play them on more players like the iPhone, iPad or iPod, you'd better convert the AVI to other formats like the MP4, MOV, M4V or etc. Here, I'll recommend the Video Converter for Mac (EI Capitan and Yosemite compatible), which enables you to convert an AVI to any popular video format for various players, devices and applications. For QuickTime, you can convert the AVI to an MOV file that is associated with QuickTime. See more tips below.

Step 1: Drag the AVI files onto the interface.
Step 2: Choose any format or device you want (most popular format or devices are also supported here).
Step 3: Simply hit Convert at the lower-right corner of its interface.

Solution 2: Play AVI in QuickTime by installing Perian plugin

The QuickTime player is mostly used in Mac OS, if you don't want to use the first solution to convert the AVI files to QuickTime compatible formats, you can try this solution, but no 100% work guarantee.

Perian, is a great open-source QuickTime component that allows playback of different video formats that cannot be played natively on your Mac computer. If you want to use QuickTime as your main video player, you may choose to download Perian because it provides the necessary codecs or components that will allow you to play AVI on Mac. If you have QuickTime 7, you may be glad to discover that it can actually play AVI files without needing any additional plug-ins and codecs.

What you need to know before downloading Perian:
1. The latest version 1.2.3 of Perian doesn't work on Mac OS X Mavericks, let alone Yosemite and Mac 10.11 EI Capitan because Perian requires installation of quicktime 7, which doesn't exist for Mavericks and above. It also doesn't work on Mac OS X Mountain Lion.
2. With a Mac running Mac OS X 10.7, say, Lion, you have to downgrade to the previous version, say 1.2.2. The version of 1.2.3 of Perian does not support QuickTime 10 in Lion and fails to fix the loss of audio after one second in xvid files with ac3.
3. Before installing Perian, you need to remove all QuickTime Components installed on your Mac, like FFusion, Xvid Delegate, 3ivX, DivX, DivX Decoder, XviD, msmpeg4v1, msmpeg4v2, AviImporter, EX_M4S2, Casio AVI Importer, AC3 Codec, and MatroskaQT.
4. For a Mac running Lion or Mountain Lion, converting AVI video to QuickTime is highly recommended.

Can Quicktime Open Avi

Solution 3: Play AVI with a AVI player Mac

Open Avi With Quicktime Pro

The VLC media player, is an excellent open-source media player that is known for supporting a wide range of audio and video files. Unlike other media players which have limited format-support, you will be surprised that VLC can play a video or audio file that you didn't even know existed. If your OS is Snow Leopard or higher, installing VLC is definitely a good choice especially if you only plan on watching AVI files on your computer.

How To Open Avi Files With Quicktime Player

Cons of this AVI player (VLC media player):

1. VLC player doesn't play AVI videos with high qualities.
2. VLC player doesn't support EI Capitan.