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YouTube is the most popular and largest video sharing website in the world, where you can find any video you want, from movie trailer to movie extras, funny videos to learning courses, etc. If you find some videos are important or valuable to you, you can download YouTube videos and convert to AVI for playback on your iPod, iPhone, iPad, PSP, media player and virtually anywhere.

Now switch to another scene: There are more and more cameras shoot to AVI video format, such as Canon Powershot SD550 Digital Camera, Olympus FE-340, Casio EXILIM ZOOM EX-Z850, Philips P44417S, Polaroid i639, VuPoint DC-C517-VP, Samsung L73, Samsung Digimax V4, Canon PowerShot SD750 Digital ELPH, Polaroid PDC 5080, Argus DC3300, entax Optio 30, Olympus Stylus 770 SW, Casio Exilim EX-Z30, Fuji FinePix A200, etc. So if you are using any one of above cameras, you may need to convert AVI to YouTube for sharing with family and friends online.

Video Converter for Mac (Mountain Lion, Lion supported) could not only allow you to convert YouTube to AVI, but also convert AVI to YouTube on Mac OS X (snow leopard, Lion, Mountain Lion included) with high conversion quality. This article will contains following 2 Parts: Part 1 introduces how to download YouTube video and convert to AVI for wider playback ability. Part 2 shows you how to convert AVI video from various sources to YouTube for sharing with others.

Part 1: How to Download and Convert YouTube to AVI

If you need to download YouTube video on Mac, here is a more detailed guide on how to free download YouTube videos for Mac. In the Free YouTube Downloader Library, you will see a Convert button for each FLV item, which will link to a Mac YouTube to AVI Converter.

Part 2: Convert AVI to YouTube using AVI to YouTube Converter for Mac (Mountain Lion supported)

Mac AVI to YouTube Converter for Mac (Mountain Lion included) helps you to convert AVI to YouTube acceptable video formats in correct range of parameters, which is the same with what you use to convert downloaded YouTube videos to AVI format. If you want to upload video to YouTube, make sure you convert AVI to one of these formats:

* .wmv (Windows Media Video)
* .3GP (cell phones)
* .AVI (windows)
* .MOV (mac)
* .MP4 (ipod/psp)
* .MPEG
* .FLV (adobe flash)
* .SWF (shockwave flash)
* .MKV (h.264)

Now follow these steps to convert AVI to YouTube compatible video format to share your masterpieces.

Step 1: Free download and install AVI to YouTube Converter for Mac. Launch the converter, click File->Add Media Files from main menu to browse your computer hard drive and select the YouTube or AVI files you want to convert. Or you can easily drag-and-drop files into this application for converting.

Step 2: Click the double up-arrow at the bottom of this program's pane, and then select AVI or any FLV (YouTube) format from Video tab There are a variety of video and audio format for output.

Step 3: If you want to export the AVI as a YouTube HD video, here is the setting for your reference:
* Codec: h.264 (Build 15625)
* Bitrate: 1500Kb/s (Variable)
* Resolution: 1280×720 16:9 Square-Pixel Format (source file need to be HD)
* Framerate: 30fps
* Audio Format: 320Kb/s 48KHz Stereo CBR AAC Audio

Last step: Hit Convert to start AVI to YouTube or YouTube to AVI conversion for Mac OS X.

Now you could share your own tour videos, home videos and other creative videos which are in AVI formats with others by uploading to YouTube, or downloading and converting YouTube videos to AVI on Mac OS X.