Advanced pulldown format for encoding video
A pulldown format for PAL that is useful for material that will be provided to an editing system mixes fields from different input frames in only one output frame per second. This one output frame includes the odd or even field from the previous frame and the odd or even field from the subsequent frame. More particularly, twenty-four frames are mapped into fifty fields or frames, which are then played at a rate of fifty fields or frames per second. In this format, there is only one output frame per second in which the fields are from two different input frames. To recreate the original twenty-four frame per second sequence, the frame including the different fields is simply dropped as a whole frame.
1 . A method for encoding motion video having a twenty-four frame per second rate into a format having a fifty field per second rate, comprising, for each second of the motion video at twenty-four frames per second:
receiving the motion video, including a first frame, a second frame and twenty-two other frames;
producing output-frames using the twenty-two other frames of motion video;
producing an output frame using the first frame;
producing an output frame using a odd field from the first frame and an even field from the second frame; and
producing an output frame using the second frame.
2 . Apparatus for encoding motion video having a twenty-four frame per second rate into a format having a fifty field per second rate, comprising, for each second of the motion video at twenty-four frames per second:
means for receiving the motion video, including a first frame, a second frame and twenty-two other frames;
means for providing output frames using the twenty-two other frames of motion video;
means for providing an output frame using the first frame;
means for providing an output frame using a odd field from the first frame and an even field from the second frame; and
providing an output frame using the second frame.
3 . A method for encoding motion video having a 23.976 frame per second rate into a format having a 47.952 per second rate, comprising, for each second of the motion video at twenty-four frames per second:
receiving the motion video, including a first frame, a second frame and twenty-two other frames;
producing output frames using the twenty-two other frames of motion video;
producing an output frame using the first frame;
producing an output frame using a odd field from the first frame and an even field from the second frame; and
producing an output frame using the second frame.
4 . Apparatus for encoding motion video having a 23.976 frame per second rate into a format having a 47.952 field per second rate, comprising, for each second of the motion video at twenty-four frames per second:
means for receiving the motion video, including a first frame, a second frame and twenty-two other frames;
means for providing output frames using the twenty-two other frames of motion video;
means for providing an output frame using the first frame;
means for providing an output frame using a odd field from the first frame and an even field from the second frame; and
providing an output frame using the second frame.
5 . A method for encoding motion video having a twenty-four frame per second rate into a format having a fifty field per second rate, comprising, for each second of the motion video at twenty-four frames per second:
receiving the motion video, including a first frame, a second frame and twenty-two other frames;
encoding output fields using the twenty-two other frames of motion video;
encoding output fields using the first frame;
identifying an odd field from the first frame and an even field from the second frame as fields to be repeated during playback; and
encoding output fields using the second frame.
6 . Apparatus for encoding motion video having a twenty-four frame per second rate into a format having a fifty field per second rate, comprising, for each second of the motion video at twenty-four frames per second:
means for receiving the motion video, including a first frame, a second frame and twenty-two other frames;
means for encoding output fields using the twenty-two other frames of motion video;
means for encoding output fields using the first frame;
means for identifying an odd field from the first frame and an even field from the second frame as fields to be repeated during playback; and
means for encoding output fields using the second frame.
7 . A method for encoding motion video having a 23.976 frame per second rate into a format having a 47.952 per second rate, comprising, for each second of the motion video at twenty-four frames per second:
receiving the motion video, including a first frame, a second frame and twenty-two other frames;
encoding output fields using the twenty-two other frames of motion video;
encoding output fields using the first frame;
identifying an odd field from the first frame and an even field from the second frame as fields to be repeated during playback; and
encoding output fields using the second frame.
8 . Apparatus for encoding motion video having a 23.976 frame per second rate into a format having a 47.952 field per second rate, comprising, for each second of the motion video at twenty-four frames per second:
means for receiving the motion video, including a first frame, a second frame and twenty-two other frames;
means for encoding output fields using the twenty-two other frames of motion video;
means for encoding output fields using the first frame;
means for identifying an odd field from the first frame and an even field from the second frame as fields to be repeated during playback; and
means for encoding output fields using the second frame.