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Discussion in 'Apple TV and Home Theater' started by MikaelSmoot, Apr 26, 2009.
Does anyone know what to look for , or how you know to detelicine your dvd?
In the Main handbrake window click on the picture settings button and then just click the detelcine checkbox.
You only need to detelcine if a movie is interlaced. and do mean a movie in 24FPS that had to be telcined into 30fps. Like all VHS movies. Now on DVD most movies are encoded progressively which means every frame is encoded full frame and then relies on the dvd player to telcine for playback. Some DVDs are hard telicined, meaning that the film is encoded interlaced like an VHS movie. There also some older and poor dvds that switch back and forth between progressive and interlaced mid movie. The first terminator 2 dvd was like that.
As for selecting detelcine in handbrake, it does no harm to have it on as handbrake will only resort to it if the video if it sees the FPS go from 24 to 30 and sees interlacing. also always turn on decomb as well so handbrake can de interlace any interlacing left in a few frame.
Lostless gave a good explanation of what telecining is. You can't tell the difference when watching on a television set, but you can see it on a computer display. Play the movie in a program that lets you advance one frame at a time. Scroll through a clip and check for interlacing (those lines that appear, especially around the edges of moving objects) in each frame. If you see interlacing in every frame, or no interlacing at all, then the movie isn't telecined. If you see a pattern of alternating non-interlaced and interlaced frames, then the movie was telecined. For 3:2 pulldown, you'll see three non-interlaced frames and then two interlaced ones. The pattern repeats. It will be most noticeable in clips with a lot of motion, or where the camera is panning.
My situation is fairly unique, but I had some problems with some files when I had detelecining on. I was mainly taking animated mpegs that ripped (Doras, Diegos, Backyardigans, etc., i.e., stuff for my kids) and running through HB for the Apple TV. When detelecine was on, I would get problems with audio syncing that ONLY occurred when I did further editing of the files (mainly in MPEG Video Wizard, but would happen elsewhere). I don't know if anyone else had this problem, but I just wanted to note it.
Additionally, if you look at the presets, they turn on detelecining for the animation (among other presets), as I have read that there are certain aspects of the animation encoding where it is very helpful to have it on.
i have actually read on Handbrake's forums where one of the Dev team is not happy with the current iteration of Handbrake's detelicine and its effect on video files. I used to use it on everything and then found that it caused significant stuttering and judder on files when played back through PLEX
i never use it now and would strongly recommend avoiding it unless you have to use it for Anime or something else similar
I find it does a pretty good job, not perfect, but pretty good. Though I do find that the current build of HB has a severe to minor audio sync issue. Seems to rear its head most when using variable framerates which detelcine relies on. HB will encode at 24FPS when it senses a tecined movie and 30 FPS when it doesnt detect it, all in the same file.
huh? and which dev would that be ? detelecine when used with Same as source framerate actually uses detelecine to drop frames if needed, and stretches out the frame timing of the existing frames to achieve a more accurate variable framerate. However, some players cannot handle vfr very well. the PS3 is notable. I cannot speak to Plex, but I know that xbmc which plex is based on has an inherent flaw that causes it to have issues with vfr due to its rendering pipeline. The stock atv software handles vfr very well (activated with same as source framerate + the detelcine filter).
Side note. Xbox 360 does not handle VFR very well either. Goes from smooth to choppy and random points. The Western digital TV handles VFR fine, but i find audio goes out of sync. Now im not sure if this is a handbrake or WDTV issue and even quicktime has audio sync issues with HB 9.3 files. Just seems to be really noticeable on anything but a QT based player
Interesting Detelecine question?
I currently have been playing with WDTV, Plex, and Boxee.
Anyway, I used Handbrake 0.9.3 on the film Citizen X.
This was a PAL region 2 DVD.
I used standard AppleTV preset with the addition of Detelecine and Decomb (default).
I played it back on WDTV and there were 2 or 3 scenes where there was weird stuttering. I had never had any problems on the WDTV with any Handbrake files.
I chalk this up to the source material.
I am not sure if the movie was shot on film, NTSC Video, or PAL Video.
Sometimes 25 fps PAL with good production quality, can be hard to differentiate from 24 fps film when the final resolution is only Standard Def.
Especially when there are mainly indoor scenes and the outdoor scenes are all shot on overcast days which limits the dynamic range of the lighting in the scenes.
Also this could have gone from 24 fps film to 25 fps PAL video then 29.97 NTSC video then back. Or 24 fps film to 29.97 NTSC Video then 25 fps PAL video. Or one of many other variations.
I do know that it was filmed/video'd in Hungary, a PAL country, back in the early/mid 90's when many filmmakers were experimenting with shooting PAL 25 fps for transfer to 24 fps film/celluloid.
Any ideas, I'll have to try it out on Boxee, Plex, and Quicktime, just haven't had time yet.