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Stupid question time? XVid encoding

Discussion in 'Windows & Other Software' started by IAmATeaf, 18 Sep 2009.

  1. IAmATeaf

    Soldato

    Joined: 3 Apr 2007

    Posts: 7,140

    Location: South of the Watford Gap!

    Yeah I know, I've searched around the internet and think I already know the answer but here goes :D

    Is there such as thing as knowing what bitrate to use when encoding to say for example XVid? I know that the bitrate is obviously directly related to the size of the end file but seeing stuff on the internet there are loads of so called 720p files. These are normally 1280 x 5xx with a bitrate of around 2500-3000. Now this bitrate isn't really that much higher then the same file at a res of 720 x 3xx.

    So how the hell do the guys encoding the files work out what bitrate to use? Is there some sort of utility that would scan the source and give you low and high values or is it just simply a case of taking a best guess.
     
  2. Tomsk

    Soldato

    Joined: 18 Oct 2002

    Posts: 5,214

    Location: Overground, underground..

    If you work it out, the bitrate of files on the internet is often chosen so the finished file is a certain size. eg for a TV series, an entire 'season' is encoded so that it fit's neatly onto a single DVD, movies fit onto a CD etc
     
  3. mrk

    Man of Honour

    Joined: 18 Oct 2002

    Posts: 86,890

    Location: South Coast

    There are bitrate calculators out that can tell you the bitrate to use.

    Also multiple passes are done so quality is usually good!
     
  4. Energize

    Caporegime

    Joined: 12 Mar 2004

    Posts: 28,868

    Location: England

    If you want all the videos you encode to be the same quality then use a constant quality quantiser. It takes care of the bitrate for you giving you a variable filesize but guaranteed quality. Just experiment with different settings.
     
  5. MikeHunt79

    Capodecina

    Joined: 4 Jan 2004

    Posts: 20,833

    Location: ¯\_(ツ)_/¯

    go for x264 if you can, gives better quality than xvid if done right.