A friend of mine sent me a copy of his film on the computer as an “AVI” file and Quicktime complains and I can’t watch it on my Mac. Rather than look like a clueless twit I’d rather figure it out before I ask him for help: Quicktime complains that the movie is “not in a format Quicktime Player understands”.
Can you help me out? Welcome to the complex and confusing world of video and audio codecs. A codec is a protocol whereby the media is encoded and (often) compressed, and there are a ton of them. Problem is, if the video is encoded using a codec that you don’t have, video players can be completely baffled and basically see a file that has a name that makes sense (like.avi or.mov) but is completely random garbage, for all intents and purposes. There are some standard codecs that programs like iMovie and iDVD use to encapsulate video content, but sometimes you’ll find that a filmmaker – or someone encoding or “ripping” video material – uses a non-standard codec because it’ll do a better job of compressing, leave less artifacting (boxy visual noise you’ll see in scenes with lots of action and movement) or offer some security features that aren’t normally part of a video file. Worse, the audio can be separately encoded using one of a ton of audio codecs too, so you can also end up with a file where you can see the video but can’t hear anything because the video player just can’t figure that part out.
Fortunately, whether you’re on a Mac OS X system or a Windows system, there’s an open source third-party video player that includes a ton of codecs and typically can play files that Quicktime Player can’t handle. It’s called VLC and I encourage you to grab a copy for yourself at. To experiment, I recently got a video file that’s encoded in the DivX format.
How do I know? I’ll show you that too, have patience!
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First off, when I try to play the video file with Apple’s Quicktime Player, here’s what I see: That’s ugly, there’s no way around it. Instead, I open the same file in VLC and here’s what I see: Yay! VLC works just fine with the video.
Bigasoft QuickTime Converter for Mac 3.5.20.4366. Bigasoft QuickTime Converter for Mac helps you to convert WMV, AVI, RMVB, MOD, TOD, FLV, MKV, VP8 and more to QuickTime MOV and vice versa on Mac fast and easily.
Let’s see how it’s encoded, just to expand our video horizons. To do so, choose Window –> Media Information: When you select that and click on the “Codec Details” tab, here’s what we see: As you can see, the audio is in MPGA format (which is actually an MPEG-1 Layer3 Audio Stream), and the video is in XVID format. You can also dig into the video file and find out the format even if it can’t actually play the video. Because you might need the XVID codec, for example, which you can find here:. There’s no easy way around it, video can be a pain in the booty for computers. VLC makes it easier, but if you do need to get a new codec to get video (or audio) to work, don’t forget that you can use Google.
Try a search for “download mac XVID codec”, for example. Good luck and enjoy your friend’s movie. While we’re talking about movies, btw, don’t miss that I also have a popular called.
Why Do You Need a MP4 Codec for QuickTime? QuickTime can handle different video, sound and picture formats on Mac devices. It contains some of the popular codecs such as JPEG, DV, and MPEG4. 
However, you may find that it does not play some formats of MP4. This is because QuickTime only supports some of the MP4 video and audio codecs. Therefore, you may find that if you have MP4 files that QuickTime does not support, they will not play. This means that to play MP4 files that are not supported by QuickTime, there is a requirement to convert them to a supported format. You will need an MP4 codec for QuickTime. Get the Best MP4 Codec for QuickTime on Mac iSkysoft iMedia Converter Deluxe is the best MP4 codec that can enable playing of MP4 videos on Mac devices. The converter is a tool used to convert videos and audio from one format to another.
In this case, it can convert the MP4 files on your Mac device to a format that is recognized by the media player. Other than converting, the software can also be used for editing videos, burning DVDs and downloading audio and video files from various sharing sites. Most Useful Software to Convert MP4 Videos for QuickTime: • Convert MP4 videos to QuickTime compatible format with only three steps. • It converts videos at 90 times faster while maintaining the original quality and it supports different input and output formats. • Download online videos: It can download videos from various video sharing sites such as Hulu, Youtube and Facebook as well as convert them directly for use on the desired device. • Burn MP4 videos to DVD, or copy your DVD file as a backup as needed. • Edit your MP4 videos before conversion.