Maintaining continuous film mode with bad edits
View Patent ↗A method for editing spliced-together video comprising a cut-out sequence followed by a cut-in sequence, both being in 3:2 pull-down format. A bad edit is detected, and either a number of contiguous frames at the end of the cut-out sequence and/or a number of contiguous frames at the beginning of the cut-in sequence are deleted in order that the 3:2 pull-down sequence is preserved in the spliced-together video. Alternatively, a first number of frames at the end of the cut-out sequence and/or a second number of frames at the beginning of the cut-in sequence are copied/renamed and inserted from other fields in order that the pull-down format is preserved in the spliced-together video.
1. A method for editing spliced-together video comprising a cut-out sequence followed by a cut-in sequence, each of the cut-out and cut-in sequences being in 3:2 pull-down format, a cut point being defined at the end of the cut-out sequence which is the beginning of the cut-in sequence, the method comprising:
detecting, by a detector, a bad edit wherein the spliced-together video does not preserve the 3:2 pull-down format; and
deleting a number of contiguous frames at the end of the cut-out sequence and/or a number of contiguous frames at the beginning of the cut-in sequence in order that the 3:2 pull-down sequence is preserved in the spliced-together video by a controller.
2. A method according to claim 1 , wherein:
when two or more frames are deleted, preserving symmetry by deleting frames as equally as possible from both sides of the cut point.
3. A method, according to claim 1 , further comprising:
determining a frame type at the end of the cut-out sequence and at the beginning of the cut-in sequence; and
determining a number of frames to delete to preserve the pull-down sequence.
4. A method, according to claim 3 , wherein there are four frame types, a frame comprises two fields, and further comprising:
when deleting a frame, deleting all fields from each frame type.
5. A method, according to claim 1 , further comprising:
when deleting frames, deleting complete frames.
6. A method, according to claim 1 , wherein a frame comprises two fields, and further comprising:
ensuring that all frames that straddle the cut point have all their fields originating from the same film frame.
7. A method, according to claim 1 , further comprising:
if the frames straddling the cut point do not originate from the same film frame, deleting an entire 5-frame sequence that straddles the cut point.
8. A method, according to claim 1 , wherein there are four lettered (A-D) frame types, a frame comprises two fields, and further comprising:
ensuring that all fields for the same frame type come from the same, single original film frame and that each field in a sequence has equal or later temporal reference.
9. A method, according to claim 1 , wherein there are four lettered (A-D) frame types, two of which are 2-field frame types, the other two of which are 3-field frame types, and when converting from a 2-field frame type to a 3-field frame type, fields are repeated and the repeat fields contain the same video data.
10. A method, according to claim 1 , wherein each frame comprises two fields, there are odd (o) and even (e) field types, and a sequence always has alternating field types.
11. A method for editing spliced-together video comprising a cut-out sequence followed by a cut-in sequence, each of the cut-out and cut-in sequences being in 3:2 pull-down format, comprising:
detecting a bad edit by a detector wherein the spliced-together video does not preserve the pull-down format; and
inserting a first number of frames at the end of the cut-out sequence and/or a second number of frames at the beginning of the cut-in sequence in order that the pull-down format is preserved in the spliced-together video by a controller.
12. A method according to claim 11 , wherein:
when two or more frames are inserted, preserving symmetry by inserting frames as equally as possible from both sides of the cut point.
13. A method, according to claim 11 , further comprising:
determining a frame type at the end of the cut-out sequence and at the beginning of the cut-in sequence; and
determining a number of frames to insert to preserve the 3:2 pull-down sequence.
14. A method, according to claim 13 , wherein there are four frame types, a frame comprises two fields, and further comprising:
when inserting a frame, inserting all fields from each frame type.
15. A method, according to claim 11 , further comprising:
when inserting frames, inserting complete frames.
16. A method, according to claim 11 , wherein a frame comprises two fields, and further comprising:
ensuring that all frames that straddle the cut point have all their fields originating from the same film frame.
17. A method, according to claim 11 , further comprising:
when a frame straddles a cut point, copying/renaming the last field of the cut-out sequence from a previous field of the cut-out sequence.
18. A method, according to claim 11 , further comprising:
when a frame straddles a cut point, copying/renaming the first field of the cut-in sequence from a subsequent field of the cut-in sequence.
19. A method, according to claim 11 , wherein there are four lettered (A-D) frame types, a frame comprises two fields, and further comprising:
ensuring that all fields for the same frame type come from the same, single original film frame and that each field in a sequence has equal or later temporal reference.
20. A method, according to claim 11 , wherein there are four lettered (A-D) frame types, two of which are 2-field frame types, the other two of which are 3-field frame types, and when converting from a 2-field frame type to a 3-field frame type, fields are repeated and the repeat fields contain the same video data.
21. A method, according to claim 11 , wherein each frame comprises two fields, there are odd (o) and even (e) field types, and a sequence always has alternating field types.