Steve Mullen
December 22nd, 2006, 06:01 PM
Got this explanation from Sony today:
The "24A" mode is actually the same as the "24" mode provided by the prototypes. The A frame is always :00 because "repeat" frames are added to always complete a 15-frame GOP. Therefore, the TC accurately represents the "type" of frame in the 2-3 pulldown cadence.
Which is why EDIUS 4's "23.98 over 59.94" mode works correctly. It doesn't use the subcode data at all.
Vegas also uses the 24A mode to recognize and remove the 2:3 pulldown. (It appears the extra 6 frames per second are dropped during capture leaving a true 23.98 file.) And, Vegas seems to work fine with 24A.
The NEW "24"mode does generate not "repeat" frames so the last GOP of each shot may have fewer than 15-fames. Because the A-frame of the next shot doesn't always have a TC of :00, the subcode must be used. In this case, the captured file may be 30fps, and the subcode is used during playback. Or, the subcode may be used to drop frames during capture.
This is something those with new V1's may be able to check.
<<<<< Note, the "24" mode MAY not work with the 7.0c version of Vegas. So if you have a V1 and "24" doesn't work with Vegas, try "24A." >>>>>
So, why was the "24" mode included? Generally, the feeling was that Sony needed to provide a mode where people could shoot in 24p, but not experience "repeat" frames. Thus, the 24 mode is primarily for folks that want a "film style look" who rely on in-camera" editing for reducing the overall editing time of their projects.
Obviously, it is also good for anyone who needs to show video directly from the camera without pauses.
Now the Sony sheet that claims bringing 24A into a computer and playing it as a movie will remove the pauses, may be wrong. The pauses are likely removed only when any "repeat" frames are edited out.
The "24A" mode is actually the same as the "24" mode provided by the prototypes. The A frame is always :00 because "repeat" frames are added to always complete a 15-frame GOP. Therefore, the TC accurately represents the "type" of frame in the 2-3 pulldown cadence.
Which is why EDIUS 4's "23.98 over 59.94" mode works correctly. It doesn't use the subcode data at all.
Vegas also uses the 24A mode to recognize and remove the 2:3 pulldown. (It appears the extra 6 frames per second are dropped during capture leaving a true 23.98 file.) And, Vegas seems to work fine with 24A.
The NEW "24"mode does generate not "repeat" frames so the last GOP of each shot may have fewer than 15-fames. Because the A-frame of the next shot doesn't always have a TC of :00, the subcode must be used. In this case, the captured file may be 30fps, and the subcode is used during playback. Or, the subcode may be used to drop frames during capture.
This is something those with new V1's may be able to check.
<<<<< Note, the "24" mode MAY not work with the 7.0c version of Vegas. So if you have a V1 and "24" doesn't work with Vegas, try "24A." >>>>>
So, why was the "24" mode included? Generally, the feeling was that Sony needed to provide a mode where people could shoot in 24p, but not experience "repeat" frames. Thus, the 24 mode is primarily for folks that want a "film style look" who rely on in-camera" editing for reducing the overall editing time of their projects.
Obviously, it is also good for anyone who needs to show video directly from the camera without pauses.
Now the Sony sheet that claims bringing 24A into a computer and playing it as a movie will remove the pauses, may be wrong. The pauses are likely removed only when any "repeat" frames are edited out.