Originally Posted by Mike99
Where are most people getting their 24p content from? Is this from playing Blu-ray discs on the HTPC? Or from playing rips of Blu-ray?
If you were to just play a Blu-ray disc how would you know if was 24/23.976 or 30/29.97 fps? If it's a movie you could presume it was shot in 24 fps film. But what about a disc with a TV program or movie, how would you know if it was done in film or 30 fps video?
I can't speak for others, but I rip my BDs to MKV files and store them centrally on a NAS. This way the movies can be played back in any room of the home on a small/cheap media player. The HTPC which runs XBMC, has an SSD, BD drive and other goodies is in the main family viewing area.
All BD material (at least for North America) is 23.976, whether it was originally a 24.00 FPS movie or a 29.97 FPS TV series (the frame rate would be converted in both cases when it is mastered for blu-ray).
DVD on the other hand is 29.97 and when displaying a 24FPS movie there is always 3:2 judder present because it's introduced as part of the 24 frame-per-second film to 30 frame per second video conversion process.
The reason we have frame drops is that nasty 23.976 instead of a nice even 24.000 fps. The reason for this tiny offset, which results in a frame drop ever 40 seconds or so if 23.976 content is not synced up correctly is due to legacy of the NTSC format which is now over 70 years old.
Basically when you play NTSC BD content back on your TV you have two choices. You can play it back in a multiple of 24P if your TV supports it (many higher end ones do)... the draw back of 24P playback is the previously mentioned problem of dropped frames if your video card is not up to snuff... as well as some models of TV exhibiting a film like "flickering" which some find distracting.
Alternatively you can play the content back at 60fps. The 60fps conversion should result in no dropped frames, but does result in what is referred to as 3:2 pulldown judder in which there can be a perceived strobing or image "tearing" that happens when the camera pans around... it is typically very noticeable on static shots with a slow pan, such as the one in which there is a flyover of the aircraft carrier USS Intrepid in the movie I am Legend... it can also often be seen during fast action shots in which the video appears to "rip" or tear due to the 3:2 pulldown effect.
These problems are not new to HTPC. People have been complaining about 3:2 pulldown judder since the VHS days. The problem is more apparent these days due to the increasing sizes of televisions.
Many people though will never notice these problems even if they are pointed out to them. Part of this might be lifetime conditioning of judder from watching 3:2 pulldown material.