{"id":10446,"date":"2020-03-20T11:09:55","date_gmt":"2020-03-20T02:09:55","guid":{"rendered":"https:\/\/je1sgh.mydns.jp\/je1sghblog\/?p=10446"},"modified":"2020-03-20T11:09:55","modified_gmt":"2020-03-20T02:09:55","slug":"itunes%e3%81%ae%e9%9f%b3%e9%a3%9b%e3%81%b3%e4%ba%8b%e4%bb%b6","status":"publish","type":"post","link":"https:\/\/je1sgh.mydns.jp\/je1sghblog\/?p=10446","title":{"rendered":"iTunes\u306e\u97f3\u98db\u3073\u4e8b\u4ef6"},"content":{"rendered":"\n

あいかわらず，iTunes1<\/a><\/sup>Catalinaは使用せず，引き続きMojaveを使っています．<\/span>で自分の音楽ライブラリーを古い曲から順に聞いています．昨日，Gloria Estephan & Miami Sound Machineの1-2-3を聞いていたら，途中で突然途切れて，次の曲に飛びました．電子音源の音飛びです😓<\/p>\n\n\n\n

今日，思い出して，再現性を確認したら，2′ 34″のところで毎回飛びます．その少し後から再生すると最後まで演奏されるので，まさに，2′ 34″のところに傷があって飛ぶようです．<\/p>\n\n\n\n

データ形式は，128kbpsのm4aです．手持ちのCDからiTunesでデジタイズしたはずです．<\/p>\n\n\n\n

iTunes でなくて，Quick Time Playerで再生してみたところ，同じ場所で再生が止まってしまいます．何らかの原因で音源データが破損してしまったようです．タイムスタンプは同じ時にエンコードした前後の曲と同じですし，rsyncでも同じと判断されます．ですから，「内部的」に破損してしまったようです．<\/p>\n\n\n\n

Time Machineで去年の11月のデータに戻してみましたが，同じです．<\/p>\n\n\n\n

Time Machineの他にもいくつかバックアップがありますが，そのひとつのRaspberry Pi 4Bのサーバー上のバックアップからコピーし直したら，正常になりました．<\/p>\n\n\n\n

内部的破損ということであれば，壊れたファイルの部分に別のファイルが書かれると，そのファイルも壊れる可能性があるので，壊れたファイルは改名してそのまま残しました．<\/p>\n\n\n\n

\"\"<\/figure><\/div>\n\n\n\n

追記（2020\/03\/21）<\/h3>\n\n\n\n

その後いろいろ調べてみましたが，セクター不良とかではないようで，1年くらい前のバックアップの同曲のファイルは既に皆壊れていました．<\/p>\n\n\n\n

今回復元に使用したバックアップは，3年前まで使用していましたが2<\/a><\/sup>差分バックアップではなく，rsyncで同期してました．<\/span>，その後都合で使用を止めたものでした．<\/p>\n","protected":false},"excerpt":{"rendered":"

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