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Last active August 29, 2015 13:58
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convert mkv to mp4 without reencoding
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gistfile1.txt
背景：一般的mkv，視頻用的是h264，音頻用的是AC3，蘋果都支持，但mkv這種封裝格式蘋果不支持。
此命令是一個事例，適用于一般的mkv，此處不做視頻和音頻重編碼，只修改封裝格式，同時還把外掛字幕一並打上。
只轉封裝不重編碼的好處是速度快，基本相當于硬盤拷貝。
轉碼前最好先ffmpeg -i a.mkv看一下視頻信息再看要怎樣轉碼，具體信息可參考ffmpeg.org官方文檔
ffmpeg -i a.mkv -i a.eng.srt -map 0:0 -map 0:1 -map 1:0 -vcodec copy -acodec copy -scodec mov_text -metadata:s:s:0 language=eng -y b.mp4
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