1.將帶效果的視頻拉入PR，如下圖紅框所示；
/iknow-pic . cdn . BCE Bos . com/77094 b 36 acaf 2d 97d 24 a5d 801001e 939019366“target =“_ blank“title =““class =“ikqb _ img _ alink“& gt；/iknow-pic . cdn . BCE Bos . com/77094 b 36 acaf 2d 97d 24 a5d 801001e 939019366？x-BCE-process = image % 2f resize % 2Cm _ lfit % 2Cw _ 600% 2Ch _ 800% 2c limit _ 1% 2f quality % 2Cq _ 85% 2f format % 2Cf _ auto“esrc =“/77094 b 36 acaf 2d 97d 24 a5d 801001e 939019366“/& gt；
2.然後將視頻拉入時間軸，如下圖紅框所示；
/iknow-pic . cdn . BCE Bos . com/9f 510 FB 30 f 2442 a 77 c 15fe 11dc 43 ad 4bd 1113026 e“target =“_ blank“title =““class =“ikqb _ img _ alink“& gt；/iknow-pic . cdn . BCE Bos . com/9f 510 FB 30 f 2442 a 77 c 15fe 11dc 43 ad 4bd 113026 e？x-BCE-process = image % 2f resize % 2Cm _ lfit % 2Cw _ 600% 2Ch _ 800% 2c limit _ 1% 2f quality % 2Cq _ 85% 2f format % 2Cf _ auto“esrc =“/9f 510 FB 30 f 2442 a 77c 15fe 11 DC 43 ad 4bd 165438
3.點擊時間軸左框中的“效果”，如下圖紅框所示；
/iknow-pic . cdn . BCE Bos . com/7 ACB 0 a 46 f 21 FBE 09694 ec0a 066600 c 338744 ad 75“target =“_ blank“title =““class =“ikqb _ img _ alink“& gt；/iknow-pic . cdn . BCE Bos . com/7 ACB 0 a 46 f 21 FBE 09694 ec0a 066600 c 338744 ad 75？x-BCE-process = image % 2f resize % 2Cm _ lfit % 2Cw _ 600% 2Ch _ 800% 2c limit _ 1% 2f quality % 2Cq _ 85% 2f format % 2Cf _ auto“esrc =“/7 ACB 0a 46 f 21 FBE 09694 ec0a 066600 c 338744 ad 75“/& gt；
4.在效果中選擇“視頻效果”，如下圖紅框所示；
/iknow-pic . cdn . BCE Bos . com/91 ef 76 c 6 a 7 efce 1 BD 7 a 7 CB 7 ea 251 F3 deb 58 f 65 f 1“target =“_ blank“title =“class =“ikqb _ img _ alink“& gt；/iknow-pic . cdn . BCE Bos . com/91 ef 76 c 6 a 7 efce 1 BD 7a 7 CB 7 ea 251 F3 deb 58 f 65 f 1？x-BCE-process = image % 2f resize % 2Cm _ lfit % 2Cw _ 600% 2Ch _ 800% 2c limit _ 1% 2f quality % 2Cq _ 85% 2f format % 2Cf _ auto“esrc =“/91 ef 76 c 6a 7 efce 1 BD 7a 7 CB 7 ea 251 F3 deb 58 f 65f 1“/& gt；
5.在視頻效果中選擇“變換”，如下圖紅框所示；
/iknow-pic . cdn . BCE Bos . com/203 FB 80 e 7 bec 54 e 70 b 1819 aab 4389 b 504 EC 26a 89“target =“_ blank“title =““class =“ikqb _ img _ alink“& gt；/iknow-pic . cdn . BCE Bos . com/203 FB 80 e 7 bec 54 e 70 b 1819 aab 4389 b 504 EC 26 a 89？x-BCE-process = image % 2f resize % 2Cm _ lfit % 2Cw _ 600% 2Ch _ 800% 2c limit _ 1% 2f quality % 2Cq _ 85% 2f format % 2Cf _ auto“esrc =“/203 FB 80 e 7 bec 54 e 70 b 1819 aab 4389 b 504 EC 26a 89“/& gt；
6.然後在變換效果中選擇“裁剪”，如下圖紅框所示；
/iknow-pic . cdn . BCE Bos . com/7a 899 e 510 FB 30 f 24 e 18 CEE b7c 595d 143 ad 4 b 036 b“target =“_ blank“title =““class =“ikqb _ img _ alink“& gt；/iknow-pic . cdn . BCE Bos . com/7a 899 e 510 FB 30 f 24 e 18 CEE B7 c 595d 143 ad 4 b 036 b？x-BCE-process = image % 2f resize % 2Cm _ lfit % 2Cw _ 600% 2Ch _ 800% 2c limit _ 1% 2f quality % 2Cq _ 85% 2f format % 2Cf _ auto“esrc =“/7a 899 e 510 FB 30 f 24 e 18 CEE B7 c 595d 143 ad 40 b 36 b“/》；
7.將裁剪效果直接拖動到視頻時間軸中，如下圖紅框所示；
/iknow-pic . cdn . BCE Bos . com/0d 338744 ebf 81a4c 5904 ee 7 DDA 2a 6059252 da 64 b“target =“_ blank“title =““class =“ikqb _ img _ alink“& gt；/iknow-pic . cdn . BCE Bos . com/0d 338744 ebf 81a4c 5904 ee 7 DDA 2a 6059252 da 64 b？x-BCE-process = image % 2f resize % 2Cm _ lfit % 2Cw _ 600% 2Ch _ 800% 2c limit _ 1% 2f quality % 2Cq _ 85% 2f format % 2Cf _ auto“esrc =“/0d 338744 ebf 81a4c 5904 ee 7 DDA 2a 6059252 da 64 b“/& gt；
8.然後點擊操作框左上角的“效果控制”，如下圖紅框所示；
/iknow-pic . cdn . BCE Bos . com/AE 51 F3 deb 48 F8 c 54 db 9 DC 79 b 37292 df 5e 0 Fe 7 f 33“target =“_ blank“title =““class =“ikqb _ img _ alink“& gt；/iknow-pic . cdn . BCE Bos . com/AE 51 F3 deb 48 F8 c 54 db 9 DC 79 b 37292 df 5e 0 Fe 7 f 33？x-BCE-process = image % 2f resize % 2Cm _ lfit % 2Cw _ 600% 2Ch _ 800% 2c limit _ 1% 2f quality % 2Cq _ 85% 2f format % 2Cf _ auto“esrc =“/AE 51 F3 deb 48 f 8 c 54 db 9 DC 79 b 37292 df 5e 0 Fe 7f 33“/& gt；
9.效果控件默認會打開“裁剪”菜單，如下圖紅框所示；
/iknow-pic . cdn . BCE Bos . com/024 f 78 f 0f 736 AFC 3c 4d 3c 3d 1be 19 ebc4 b 64512c 5“target =“_ blank“title =““class =“ikqb _ img _ alink“& gt；/iknow-pic . cdn . BCE Bos . com/024 f 78 f 0f 736 AFC 3c 4d 3c 3d 1be 19 ebc4 b 64512 C5？x-BCE-process = image % 2f resize % 2Cm _ lfit % 2Cw _ 600% 2Ch _ 800% 2c limit _ 1% 2f quality % 2Cq _ 85% 2f format % 2Cf _ auto“esrc =“/024 f 78 f 0f 736 AFC 3c D4 C3 DD 1be 19 ebc4 b 64512 C5“/& gt；
10.設置裁剪菜單的“頂部”和“底部”參數，此處設置為15%。如果希望黑邊較大，則將參數設置為大，否則將其設置為小，如下圖紅框所示；
/iknow-pic . cdn . BCE Bos . com/9a 504 fc2d 5628535 a 659d 0959 def 76 c 6 a 6ef 63 cc“target =“_ blank“title =““class =“ikqb _ img _ alink“& gt；/iknow-pic . cdn . BCE Bos . com/9a 504 fc2d 5628535 a 659d 0959 def 76 c 6 a 6 ef 63 cc？x-BCE-process = image % 2f resize % 2Cm _ lfit % 2Cw _ 600% 2Ch _ 800% 2c limit _ 1% 2f quality % 2Cq _ 85% 2f format % 2Cf _ auto“esrc =“/9a 504 fc2d 5628535 a 659d 0959 def 76 c 6a 6 ef 63 cc“/& gt；
11.這樣只調整上下參數，左右參數不調整，如下圖紅框所示；
/iknow-pic . cdn . BCE Bos . com/95 eef 01f3 a 292 df 5b 328 AEA 1b 1315c 6035 a 8739 e“target =“_ blank“title =““class =“ikqb _ img _ alink“& gt；/iknow-pic . cdn . BCE Bos . com/95 eef 01f3 a 292 df 5b 328 AEA 1b 1315c 6035 a 8739 e？x-BCE-process = image % 2f resize % 2Cm _ lfit % 2Cw _ 600% 2Ch _ 800% 2c limit _ 1% 2f quality % 2Cq _ 85% 2f format % 2Cf _ auto“esrc =“/95 eef 01f3 a 292 df 5b 328 AEA 1b 1315c 6035 a 8739 e“/& gt；
12.然後添加視頻上方和下方的黑邊，如下圖紅框所示。
/iknow-pic . cdn . BCE Bos . com/DCC 451da 81cb 39 db 200565 e2dd 160924 aa 1830 b 8“target =“_ blank“title =““class =“ikqb _ img _ alink“& gt；/iknow-pic . cdn . BCE Bos . com/DCC 451da 81cb 39 db 200565 e2dd 160924 aa 1830 b 8？x-BCE-process = image % 2f resize % 2Cm _ lfit % 2Cw _ 600% 2Ch _ 800% 2c limit _ 1% 2f quality % 2Cq _ 85% 2f format % 2Cf _ auto“esrc =“/DCC 451da 81cb 39 db 200565 e2dd 160924 aa 1830 b 8“/& amp