it is very easy to download and convert youtube videos flv files to avi,mpeg, which is supported for transferring to dvd or apple tv,

It works very well for me with good video and audio output
just google or yahoo search 'flv to video converter" or "flv to dvd" "flv to apple tv".
References :

You need to use 'zillatube'.

It downloads videos fast, convert them easily to mpg format, which is suitable for transferring to dvd.

just google search for 'zillatube'
==========================♥♥♥
References :

main features:
1. easy convert avi or other popular video formats(such as*.flv *,mpg *.mp4 *.3gp *.mkv *.rm *.rmvb *.mov *.wmv *.ogm *.ts etc.) to dvd or ISO image file.
2. support dvd menu with background music, beautiful dvd menu
3. support download youtube video and burn it to dvd
4. easy to use, only a few clicks,

visit : http://www.veffect.com or go to http://www.google.com search it.
References :

How to download video from youtube or other online sites!

Step 1:
download the free program called VDownloader (last check it was version 0.61)
http://www.vdownloader.es/download.html

Step 2:
Unzip the archive to your desktop

Step 3:
In the vdownloader folder (that you just unzipped) double click and open up the program VDownloader

Step 4:
Go to youtube (or other video site) and find the video you want to download.

Under the video, click on the Share link

where it says 1. Copy and paste this link into an email or instant message: – select the link and copy it to your clipboard (either right click and select copy or hold the Ctrl button down and press c).

step 5:
Go back to the VDownloader program you opened and paste the link in the VIDEO URL box (either right click and select paste or hold down Ctrl and press v).

step 6:
Press the Download button next to the VIDEO URL you just pasted (*NOTE – Prior to hitting the download button you can choose the OUTPUT FORMAT from the dropdown list to the right of the download button.)

step 7:
Select the locaction you want the file saved to
-name your file and hit the SAVE button

step 8:
The video will be downloaded, and then converted and saved to the location you specified in step 7!
References :