I don't know what you call it, but I'd like to take an existing video with music and maybe use every 4th (or whatever) video frame without changing the music. As a brute force method, I accomplished this by:
1) Unlinking audio & video
2) Time-shrinking the video by a factor of 4 (or whatever). So, I'd take a 4 minute video, speed it up to 60 seconds then create a .MPG file that is fast & short.
3) Read in the new fast-short video & time stretch it to the original length.
4) Add back the original music
This worked, but it's a bit cumbersome. Plus, if 4x isn't the right speed-up, you need to start over - maybe several times. Is there a filter or something that accompishes this?
Thanks!