This is a 2 step process :
Step 1 = Convert :
Case 1 : Online Videos
If the video is available online (on YouTube or Vimeo) then you can use tinyvid.tv http://tinyvid.tv/convert to convert it to Ogg format and view using Firefox. Firefox .3.5+ has native support to watch/play/stream ogg videos. (native support means you do not need flash plugin).
You can use another utility called "Video DownloadHelper 4.6.2 " ( https://addons.mozilla.org/en-US/firefox/addon/3006 ) addon on Firefox. This is a firefox specific solution. After installing it, you will a download button.
* Click on "Download and Convert"
* click on "Details"
* Select Output format as "Ogg"
* Video codec : libtheora
* Audio codec :verbois
* Extention : ogg
Save it as Ogg profile.
This will download and convert files into ogg (ogv) format and It will be save your system.
Case 2 : Local videos
You can install OggConvert GUI utility ( http://oggconvert.tristanb.net/ ) - It is a GUI based utility which will convert video to ogg format. You can install it using
You can convert AVI files to ogg using ffmpeg2theora ( http://v2v.cc/~j/ffmpeg2theora/examples.html )
$ yum install oggconvert
$ ffmpeg2theora nuxified.aviStep 2 = View It : for watching ogg , just right click and Open with Firefox. You can also watch on VLC but i prefer Firefox because I feel a better quality with Firefox. Only one thing was missing in Firefox - "Full Screen html5 video playback" So here is the solution - Just install this addon - http://en.design-noir.de/mozilla/fullscreen-video/ Now you can watch full screen video iin Firefox.