What is the different bettween CBR and VBR, plus what is....

[warlock110]

to continue, what is deinterlacing or telecide. Thanks in advance, i'm asking this because I saw it as an option to choose when encoding to SVCD but don't know what it does or when to use them.

[poopyhead]

CBR is constant bitrate, this means that the encoder will use the exact same bitrate or bandwidth for every scene in the movie...this means that horribly slow scenes will get as much bitrate as really fast motion scenes....does this make sense to you? slow scenes don't need that much bandwidth to encode it, while fast motion scenes need alot of bandwidth for it not to be blocky and choopy...hence CBR is baaaaaaaaaaaaaaaaaaaaaaad!

VBR is variable bitrate, it allows the encoder to decide which bitrate to use for which scenes from a range u bitrate u specifiy to the encoder (max, min, avg bitrate)....basically, the encoder will dynamically determine how much bandwidth to give each scene, hence, it will divert some bandwidth from slow scenes (which don't need the bandwidth to begin with) to the fast motion scenes (which needs lotta bandwidth)...good stuff

as for de-interlace filter, if your movie is majority FILM, progressive (you should be able to figure this out from dvd2avi's info box), then you're gonna enable force film in dvd2avi and encode your dvd rip as 23.976 fps w/ 3:2 pulldown to make it 29.97 fps on playback (in dvd player)

however, most movies are not 100% FILM..(i.e. 98% FILM 2% NTSC)...that 2% NTSC may cause some horizontal lines to appear in your rip when u force film it in dvd2avi (when u force film u basically treat the entire thing as 100% pure FILM, even thou it's only 98% FILM) this usually gives no probs except for the occasional horizontal lines, in this case you can use the de-interlace filter to remove the lines no prob ... i usually use the double (adaptive) de-interlace filter

however, if u do decide to use the adaptive filter, it will take you longer to encode the movie because the computer will decide which scenes need to be de-interlaced and which scenes can be left alone (so it results in higher quality because tmpgenc would de-interlace the entire movie, only scenes that have the horizontal lines)

[warlock110]

Thank you for the replies, it's really clear and helpful.