The article includes two parts.
Part 1: How to download and convert YouTube videos to iPod Video, iPod Touch, iPod Nano, iPhone, Zune, PSP, etc on windows?
Part 2: How to download and convert YouTube videos for Mac user?


Part 1: How to download and convert YouTube videos to iPod Video, iPod Touch, iPod Nano, iPhone, Zune, PSP, etc on windows?

Step 1: Download YouTube Videos with this YouTube Downloader
Firstly, Free download YouTube Mate here and install it. You can know more about it from Cucusoft Youtube Mate.
Then, Click "Download" button, copy the Youtube url address to cucusoft youtube Mate, then click "Ok" button. (Note, you can set the output video path under "save to " option, the default root is under C:\YoutubeDownload, All the downloaded youtube videos shall be stored under the "save to" path you point to). If you open YouTube videos and copy the url, the  Download settings panel will pop audo indeed.  It's totally a free YouTube Downloader.



The whole process is very easy and fast !!! You could download unlimited videos at the same time. Just copy past and click OK.

Step 2: Convert YouTube Videos & Preview flv Videos with this YouTube Converter, YouTube Player

Convert YouTube videos .flv to various video formats, including avi, DivX, XviD, rm, rmvb, MOV, MPEG, MPEG4 AVC, H.264 and WMV, VOB, VCD, SVCD and DVD Format .mpg;

Convert downloaded YouTube videos .flv to a format compatible with your favorite portable device, including iPod Video, iPod Touch, iPod Nano, iPhone, Zune, PSP, PDA, Apple TV, as well as video capable MP3 players, 3GP mobile phones, and Pocket PC.



Step 3: Output Profiles - YouTube Converter helps you convert YouTube flv to

3GPP - 3rd Generation Partnership Project (.3gp)
3GPP2 - 3rd Generation Partnership Project 2(.3g2)
AAC - Advanced Audio Coding (.mp4, .aac)
AC3 - Dolby Digital AC-3 Audio (.ac3)
Apple TV (1280x720) H.264 Movie(.mp4)
Apple TV (640x480) MPEG-4 Movie(.mp4)
ASF - Advanced Streaming Format (.asf)
AVI - Audio video Interleaved (.avi)
DVD - DVD Format (.mpg)
FLV - Flash Video Format, YouTube Video, etc. (.flv)
H.264 Movie (.mp4)
iPhone (480x320) H.264 Movie(.mp4)
iPhone (480x320) MPEG-4 Movie(.mp4)
iPod MPEG-4 Movie (.mp4) -- Default for iPod
iPod H.264 Movie (.mp4)
iPod touch H.264 Movie(.mp4)
iPod touch MPEG-4 Movie(.mp4)
iPod TV Size1 (480x368) MPEG-4 Movie (.mp4)
iPod TV Size2 (512x384) MPEG-4 Movie (.mp4)
iPod TV Size3 (640x480) MPEG-4 Movie (.mp4)
iPod video nano H.264 Movie (.mp4)
iPod video nano MPEG-4 Movie(.mp4)
M4A - MPEG Layer-4 Audio (.m4a)
MOV - QuickTime Movie (.mov)
MP2 - MPEG Layer-2 Audio (.mp2)
MP3 - MPEG Layer-3 Audio (.mp3)
MP4 - MPEG-4 Video (.mp4)
MPEG-1 Video (.mpg)
MPEG-2 Video (.mpg)
PDA - Personal Digital Assistants Device (.wmv)
PPC - Pocket P.C. Device (.wmv)
PSP - PSP MPEG-4 Movie (.mp4)
RA - RealAudio (.ra)
RM - RealVideo (.rm)
SVCD - Super Video CD Format (.mpg)
SWF - For Website Use , SWF Format (.swf)
VCD - Video CD Format (.mpg)
VOB - VOB file - MPEG2 PS Format (.vob)
WMA - Windows Media Audio (.wma)
WMV - Windows Media Video (.wmv)
Zune TV Size1 (480x368) Windows Media (.wmv)
Zune TV Size2 (512x384) Windows Media (.wmv)
Zune TV Size3 (640x480) Windows Media (.wmv)
Zune Video - MPEG-4 (.mp4)
Zune Video - Windows Media 7 (.wmv)
Zune Video - Windows Media 8 (.wmv)
Zune Video - Windows Media 9 (.wmv)

YouTube Mate can NOT ONLY download YouTube videos, convert YouTube .flv videos, BUT ALSO convert AVI, mpg, MPEG, WMV, ASF, MOV, RM/RMVB, MP4, MKV to FLV, etc all output formats. Such a powerful YouTube Video Converter, free YouTube Downloader, it's worth of owning YouTube Mate for Flash videos collecting and YouTube fans like you.

Part 2: How to download and convert YouTube videos for Mac user?
Click here to download YouTube Downloader for Mac and follow the steps below to download and convert YouTube videos:
1. Launch YouTube Downloader for Mac
2. Download YouTube Videos
3. Convert YouTube Videos

Step 1: Launch Program
Open Wondershare YouTube Downloader for Mac.



If this is the first time that you launch the program, you will see a pop-up window asking you to input the password of your Mac login account. This is very important for the program’s Sniffer function. You follow the steps specified on the pop-up window below:



Step 2: Download YouTube Videos
Go to YouTube website and open the pages of the videos you want to download. The program will detect the URL and automatically start downloading a video when it starts to play. From the source list, you can find the status of each file. See the figure below:



If you want to find the downloaded files, you can click the Open button to go to the directory where the downloaded files are saved.

Step 3: Convert YouTube Videos
If you want to convert any of the completed files, you can select them and click the Convert button. Then you will see the window below:



Select the output format from the “Format Preset” drop-down list for the selected files, click the Browse button to specify a location to save the converted files, and click OK to start conversion.

The conversion status of each file can be found under the “Conversion” tab, see the figure below:



If you want to find the converted files, you can click the Open button to go to the directory where the downloaded files are saved.
After the conversion, you can just put the converted files to your iPod, iPhone, PSP, Apple TV or PS3 etc. and enjoy your favorite YouTube videos on the move.

@GoodD : thank for help me that..

Nice software

That's nice

I prefer Nidesoft Video Converter. It is an excellent video converter with powerful functions. Download and install it here: http://www.nidesoft.com/downloads/video-converter.exe
and get more information here: http://www.nidesoft.com/video-converter.html

It surpass other video converters for its unique features:
〉Convert between all popular video and audio formats including AVI, MPEG, WMV, MPEG1/2/4, 3GP, MP4, DVD, VCD, SVCD, MOV, MP3,etc.
〉Convert FLV format (such as youtube, Google Video, Yahoo Video, Myspace Video) to iPod, support video crop mode setting and various output resolutions.
〉Customize output file: setting Video Bitrate, Audio Bitrate, Video Size and Volume.           
〉The Video Converter allows preview; Allows you to select target subtitle or chapter.
〉You could keep the default settings or set parameters of the video and audio codes by yourself.
〉Easy and simple to use for beginners.
〉Very fast converting speed and excellent video quality;
〉So easy to use that only a few clicks are enough; Codes are all built-in;
〉Optimized for Processor (SSE2/SSE/MMX/3DNow!) and Graphics Card Acceleration. The new version provides more friendly interface and better quality.
〉Fully optimized for Dual Core, Hyper-Thread processor.
〉Up to 4x faster than other software. Provide >400% converting speed, beyond your imagination;
〉Free Update!!! Very good Day Email Service.

It works for me