For compatibility with other camcorders, 1080p24 video is disguised as 1080i60 video when it is recorded. This process is known as telecine or pulldown. In order for the disguise to be complete, not even a simple flag is set in the video to indicate it came from a 1080p24 source. Some people are unhappy, because this engineering decision makes it difficult to keep track of which video was shot in which mode.
When editing 1080p24 and 1080i60 source on the same timeline in a video project, it is a convenience that the 1080p24 video is already telecined. Simply procede as if everything really is 1080i60. You can benefit from the low light performance of 1080p24 without the trouble of different frame rates.
To enjoy the other benefits of 1080p24 shooting mode one must remove the pulldown that makes 1080p24 video appear as 1080i60 video. This is known as pulldown removal, pullup or inverse telecine. This document explains how to do pulldown removal on 1080p24 source recorded by HDV and AVCHD camcorders using free software on Linux.
Other ways to remove pulldown are described in
$ 60ito24p src001.mtswill create a file called src001-24.mpg which contains the original 24 frames per second progressive video. The commands
$ ffmpeg -i src001.mts -ab 384000 -f mp2 -y src001.m2a $ ffmpeg -i src001.mts -r 30000/1001 -f yuv4mpegpipe \ -pix_fmt yuv420p -y /dev/stdout | yuvkineco -F 1 | mpeg2enc --no-constraints -f3 -nn -a3 -Ktmpgenc -lh \ -b24000 -V488 -r32 -G18 -D10 -q3 -s -o src001.m2v $ mplex -f3 src001.m2a src001.m2v -r28000 -b800 -o src001-24.mpgdo the same thing as the script.
The telecine cadence may change in HDV source because multiple video clips created by separate record actions are often placed into a single file when a tape is captured. For best results cut the HDV source into one file per clip before pulldown removal.
The telecine cadence will not change in AVCHD source because each clip is already stored as a separate file. As an added benefit, the pulldown method described here results in an mpeg2 file that can be easily edited. For information on editing AVCHD source see Editing AVCHD in Cinelerra.