編集 and 校正: a one-hour edited work and proofreading before printing
Read 編集 in footage editing and a meeting with an editor, then distinguish 校正 of a manuscript from listing errors found during proofreading.
編集: the length of an edited work and a meeting with an editor
「撮影した映像を一時間の作品に編集した。」 means “I edited the footage into a one-hour work.” 編集（へんしゅう） means editing. 一時間の作品 gives the one-hour length of the resulting work, rather than the time taken to carry out the editing.
「雑誌の編集を担当する人と打ち合わせた。」 means “I consulted the person responsible for editing the magazine.” 編集を担当する人 is the person responsible for editing the magazine. 打ち合わせた describes consulting that person; it does not assign completion of all the magazine’s editing to the speaker.
校正: a manuscript before printing and errors found
「印刷前に原稿を二人で校正した。」 means “Two people proofread the manuscript before printing.” 校正（こうせい） means proofreading or correction. 二人で gives the two people working together, and 印刷前に places their proofreading before printing without establishing that printing was completed.
「校正で見つかった誤字を一覧にした。」 means “We made a list of typographical errors found during proofreading.” 校正で見つかった誤字 names typographical errors found during proofreading. 一覧にした is making a list of them, rather than a verb asserting that every listed error was corrected.
Separating duration, responsibility, and document checking
In 映像を一時間の作品に編集した, the footage is the object of editing, and 一時間 describes the work’s length. That expression alone supplies no duration for the editor’s task.
Consulting the magazine editor, proofreading a manuscript before printing, and listing discovered errors are different actions. Follow the responsible person, object, and completed action in each sentence even when editing or proofreading occurs in the same broad workflow.
Is 一時間 in 撮影した映像を一時間の作品に編集した the time spent editing?
Show the answer and why
No. It is the length of the edited work: one hour. The sentence does not state the editing task’s duration, and this action differs from consulting the magazine editor or proofreading a manuscript.