With a video converter.
The following are some purposes of a video lan player or VLC; a media player that supports audio and video compression methods, can read many formats such as container formats and video formats, and it can transcode or stream audio and video into several formats.
Depending on the device, player, or platform you're using, their supported formats vary. Thus, you need to change the video format to make your file compatible with the playback device.
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leawo flv converter can not only convert flv video but also it can play most of video and sound formats
http://makesite.in/supported-youtube-file-formats/
apple products (your iPod) can only handle certain video formats. The MAIN formats for video is: MP4 The MAIN formats for audio (music) is MP3. search on goole for other formats compatible with apple products. any other products will not work with your iPod.
YouTube accepts many formats of video, but if you really want to convert your video, then you will need to download video convertor, such as "Any Video Convertor" or "MediaCoder".You can find the downloads in the related links below.
It can play many different video formats and it can also convert different video formats to others easily, also it supports GPU acceleration for better video and audio quality.
I use program VidGIF is a tool for converting selected video file to animation GIF formats.
it can support 3gp and mp4 but in mp4 you should adjust video rate ,audio rate.In both formats you should adjust screen size.
The Nexus 7 supports the following video formats out-of-the- box: H263/264 AVC, MPEG-4, VP8. With other formats such as AVI, MKV, WMV, etc, there are apps out there (Video Player, MX Player, QQPlayer, etc.) that you can use to play these other formats. Or, you can also get a video in one of those formats and with a video converter program (Windows or Mac based), iand convert them to a supported video format, then upload it into the device.
The only video format that can be played on an iPod is an .m4v file.