M4A標記問題

我遇到了將M4A原子插入文件的問題。由於原始文件沒有udta結構，因此我使用現有的M4A文件添加它作爲指南。M4A標記問題

這裏就是我所做的添加原子：

內建內存
更新MOOV原子大小的UDTA原子包括對UDTA原子
將文件複製起來的大小到第一個trak原子的末端
插入我的udta原子
照常複製剩下的部分。

原始文件和標記文件之間唯一真正的區別是mdat原子已經向下移動一點以適應標記。這使我相信在其他原子中有一些提及這個位置的信息，但我找不到一個。

下面是AtomicParsley輸出：

原始文件：

Atom ftyp @ 0 of size: 36, ends @ 36 
Atom moov @ 36 of size: 30156, ends @ 30192 
    Atom mvhd @ 44 of size: 108, ends @ 152 
    Atom iods @ 152 of size: 33, ends @ 185 
    Atom trak @ 185 of size: 30007, ends @ 30192 
     Atom tkhd @ 193 of size: 92, ends @ 285 
     Atom mdia @ 285 of size: 29907, ends @ 30192 
      Atom mdhd @ 293 of size: 32, ends @ 325 
      Atom hdlr @ 325 of size: 37, ends @ 362 
      Atom minf @ 362 of size: 29830, ends @ 30192 
       Atom smhd @ 370 of size: 16, ends @ 386 
       Atom dinf @ 386 of size: 36, ends @ 422 
        Atom dref @ 394 of size: 28, ends @ 422 
       Atom stbl @ 422 of size: 29770, ends @ 30192 
        Atom stts @ 430 of size: 24, ends @ 454 
        Atom stsd @ 454 of size: 106, ends @ 560 
         Atom mp4a @ 470 of size: 90, ends @ 560 
          Atom esds @ 506 of size: 54, ends @ 560 
        Atom stsz @ 560 of size: 26888, ends @ 27448 
        Atom stsc @ 27448 of size: 40, ends @ 27488 
        Atom stco @ 27488 of size: 2704, ends @ 30192 
Atom mdat @ 30192 of size: 2495503, ends @ 2525695

修改文件：

Atom ftyp @ 0 of size: 36, ends @ 36 
Atom moov @ 36 of size: 30323, ends @ 30359 
    Atom mvhd @ 44 of size: 108, ends @ 152 
    Atom iods @ 152 of size: 33, ends @ 185 
    Atom trak @ 185 of size: 30007, ends @ 30192 
     Atom tkhd @ 193 of size: 92, ends @ 285 
     Atom mdia @ 285 of size: 29907, ends @ 30192 
      Atom mdhd @ 293 of size: 32, ends @ 325 
      Atom hdlr @ 325 of size: 37, ends @ 362 
      Atom minf @ 362 of size: 29830, ends @ 30192 
       Atom smhd @ 370 of size: 16, ends @ 386 
       Atom dinf @ 386 of size: 36, ends @ 422 
        Atom dref @ 394 of size: 28, ends @ 422 
       Atom stbl @ 422 of size: 29770, ends @ 30192 
        Atom stts @ 430 of size: 24, ends @ 454 
        Atom stsd @ 454 of size: 106, ends @ 560 
         Atom mp4a @ 470 of size: 90, ends @ 560 
          Atom esds @ 506 of size: 54, ends @ 560 
        Atom stsz @ 560 of size: 26888, ends @ 27448 
        Atom stsc @ 27448 of size: 40, ends @ 27488 
        Atom stco @ 27488 of size: 2704, ends @ 30192 
    Atom udta @ 30192 of size: 167, ends @ 30359 
     Atom meta @ 30200 of size: 159, ends @ 30359 
      Atom ilst @ 30212 of size: 147, ends @ 30359 
       Atom ©ART @ 30220 of size: 35, ends @ 30255 
        Atom data @ 30228 of size: 27, ends @ 30255 
       Atom ©nam @ 30255 of size: 63, ends @ 30318 
        Atom data @ 30263 of size: 55, ends @ 30318 
       Atom ©alb @ 30318 of size: 41, ends @ 30359 
        Atom data @ 30326 of size: 33, ends @ 30359 
Atom mdat @ 30359 of size: 2495503, ends @ 2525862

另一個值得注意的事情是，標記的文件我用作爲參考在udta-> meta下有一個hdlr原子，但添加該標籤的副本也沒有幫助。如果我手動刪除udta原子和moov的大小數據，該文件再次工作。

當我嘗試打標記的文件，我在不同的程序得到這些錯誤：

mplayer: 
    [aac @ 0x204d720] channel element 0.0 is not allocated 
    [aac @ 0x204d720] channel element 0.0 is not allocated 
    [aac @ 0x204d720] channel element 3.13 is not allocated 
    [aac @ 0x204d720] channel element 2.14 is not allocated 
    [aac @ 0x204d720] channel element 2.9 is not allocated 
    [aac @ 0x204d720] Prediction is not allowed in AAC-LC. 
    [aac @ 0x204d720] channel element 3.1 is not allocated 
    [aac @ 0x204d720] channel element 0.3 is not allocated 
    .... 
totem: 
    ** Message: Error: Could not decode stream. 
    gstfaad.c(1319): gst_faad_chain(): /GstPlayBin2:play/GstURIDecodeBin:uridecodebin0/GstDecodeBin2:decodebin20/GstFaad:faad0: 
    decoding error: Bitstream value not allowed by specification 
banshee: 
    [Error 08:26:27.610] GStreamer stream error: Decode 
    [Error 08:26:27.960] GStreamer stream error: Decode 
    [Error 08:26:28.252] GStreamer resource error: NotFound

哦，我多麼希望的認可上比MP3的其他文件的ID3標籤計劃其他99％...

來源

2012-03-12 Chuck R

感謝xdelta3，我能夠找到標記有標記軟件的文件之間的差異，然後手動刪除和原始文件。

該問題似乎是'stco'原子，它是使用絕對文件偏移量的塊的列表。答對了！由於我添加了標籤，這些偏移量現在無效。更多的編碼嘆息

來源

2012-03-12 14:35:24

是的，這就像一個魅力工作！ – 2012-03-13 03:38:58

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