Originally Posted by Tom Roper
Doing 24p from an AVCHD is not quite the same thing usually. All the AVCHD cams that do 24 frames per second are packaging 24 progressive frames inside of a 60i stream by adding repeat flags. You will observe the playback rate of 24 fps but your HDTV monitor is refreshing the screen 2 1/2 times for every one frame of video, i.e. flashing frames in a 2:3:2:3 cadence. The irregular cadence is what gives rise to the term, "judder."
Yeah... I wasn't talking cameras. I'm not sure I'd necessarily refer to that sort of storage as 24p. I just think of 24p as a 1920x1080 progressive video stream with a 24/1.001 frame rate, like most Blu-rays apparently use (of course with AACS). Anyway I figured there would be ways to process the sort of video you mention and make it a true 24p stream from some of the items I've read in http://eugenia.gnomefiles.org/
, but come to think of it that was probably mpeg2 cameras and things are probably still rather expensive to do that sort of processing on video from an AVCHD camera.
AVCHD does not do native 24p as far as I can tell. Native 24p will invoke a compatible HDTV monitor into its exclusive 24 fps mode, in which the refresh rate will be an even multiple, for example, 72 hz, or 3 times 24 fps. Each frame is flashed three times in a symetrical cadence 3:3:3:3, so there is no appearance of judder.
I use the term AVCHD to refer to the format that some Blu-ray players will play, but the same term is also used to refer to cameras so I suppose there was probably some confusion there.
While Nero and the Ulead/Corel products I've tried have certainly been unable to do anything 1920x1080 besides interlaced, the actual AVCHD format clearly supports true 24p video http://www.avchd-info.org/format/index.html
As far as how consumer cameras package things I'm not sure what they do with video because it's not really in line with my own interests. As far as AVCHD and BDMV playback and authoring with with TotalMedia goes, true 24p seems possible. Mediainfo reports the video as 24p like encoded, and my TV goes to a 24p mode when the player outputs native.
PROCESS FOR 24P FOR THE DISKS:
1) Encode video using MeGUI
- AVS file has framerate set to 23.976
- The standalone AVC HD settings file is selected
- The output option for the video is set to 264, instead of default mp4
2) Mux to .ts using tsMuxer
3) Import video into TotalMedia to create AVCHD or BDMV
Step 1 can seemingly be replaced by using RipBot264, and setting the framerate and output type, but I'm not sure the maximum video rates are set to AVCHD maximums like in the MeGUI "AVC HD" standalone selection.
Step 3 could be eliminated by choosing the Blu-ray option in tsMuxer.