Mobile Media Converter (MMC) is a feature rich media converter which supports a huge array of audio and video format, including, MP3, WMV, FLV, MOV, Ogg, Vorbis, AMR, 3GP, iPod/iPad, PSP Compatible MP4 and many more formats. This cross platform application allows downloading YouTube videos, after which you can easily convert them to a desired format. You can convert media by simply dragging the file over to MMC interface, choosing a desired format and initiating the conversion process.  It offers presets for Apple iPad,  Palm Pre, Sony Ericsson Xperia X10 and Vivaz, HTC Desire, Android devices, and many other mobile devices, so you wont have to set Audio and Video parameters manually.
All that is required is to choose your mobile device from the list prior to selecting the media file to begin conversion process. Additionally, you can crop original video size and trim down video playback duration as per your requirements.
The application usage is dead straight. Just drag files over to the main interface, select a format followed by a click on Convert to begin the conversion process. However, if you’re not sure about the supported format of your mobile device, select Add/Remove profile from Conversion to pull-down menu in order to add your mobile device preset into the default format list.

All the devices mentioned beforehand are present here. Just select your device from the list and click Add button.

Now select the added profile from main interface and click Convert to begin conversion.
Since there is a build-in YouTube downloader, you don’t need any third-party tool to download and then convert the video. It requires you to specify the video URL and quality to start downloading process. Furthermore, you can queue YouTube videos in a list to  download them later.

Apart from listing down your favorite YouTube videos, you can also crop and trim downloaded video size and duration respectively before starting the conversion process.

It works on Windows XP, Windows Vista , Windows 7/ 8/ 8.1/ 10.