Step 1: Download YouTube to MP4 software. Install and launch it.
Step 2: Download YouTube Videos and save YouTube flv to your personal computer:

Step 3: Convert YouTube flv videos to MP4 Player compatible video:
Click
to input YouTube video file to be convertered (batch convertsion supported, you can add as many YouTube files as you want).
Profiles option, you can choose video formats what you want to convert YouTube to MP4:
Apple TV (1280x720) H.264 Movie(.mp4)
Apple TV (640x480) MPEG-4 Movie(.mp4)
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)
MP4 - MPEG-4 Video (.mp4)
PSP - PSP MPEG-4 Movie (.mp4)
Zune Video - MPEG-4 (.mp4)

Then click the folder button, select the destination you want the converted .mp4 file to store. (the default folder is stored under file: c:\ConverterOutput\)

Click
button to start converting YouTube to MP4.
After successful converting YouTube to mp4, the converted mp4 files shall be stored on the folder you have previously selected.
Ok! we have finished the whole process to convert YouTube to MP4, transfer YouTube to your MP4 Players now.