My itunes library has exclamation marks on the whole of my music collection I have to upload my CD's again! does anyone know why and what can I do?

Help, my itunes library has exclamation marks and will not play.  Do I have to reload my cd's?

What do you mean by what audio/video formats are involved? These are all files from several digital cameras.
As previously stated, AVI is a file container. It is somewhat old and its originator, Microsoft, dropped official support of it over a decade ago. However, it remains popular with PC users since almost any valid audio and/or video compression format can be stuffed to the file which synchronizes the content by interleaving the individual audio and video frames. The compression format is the specific manner in which the audio and video data are encoded as it is placed in the AVI container. You can find the compression format by inspecting the file in the Finder "Info" window, or in the "Inspector" window of the QT player (or other media player) if the file can be opened.
For instance, one popular compression combination would be to place DivX encoded video and MP3 audio in an AVI file container. However, neither DivX nor MP3 is natively supported by the QT player. (Although iTunes will natively support the MP3 audio.) Therefore, people who wish to play such files in the QT 7 Player would normally install either the DivX component or Perian but not both. Either installation will independently play such files in the QT Player, but if both are installed, the file will usually stop working since these two codecs can create a playback conflict.
However, the AVI container could just as easily contain DV along with DV audio. In this case, the file should play correctly in QT since this compression format is natively supported by the basic component configuration that comes in every current OS installation. Therefore, if such files suddenly stopped playing, this could be an indication that a component has been moved or deleted or that your system or QT embedded structure has become corrupted.

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    As previously stated, AVI is a file container. It is somewhat old and its originator, Microsoft, dropped official support of it over a decade ago. However, it remains popular with PC users since almost any valid audio and/or video compression format can be stuffed to the file which synchronizes the content by interleaving the individual audio and video frames. The compression format is the specific manner in which the audio and video data are encoded as it is placed in the AVI container. You can find the compression format by inspecting the file in the Finder "Info" window, or in the "Inspector" window of the QT player (or other media player) if the file can be opened.
    For instance, one popular compression combination would be to place DivX encoded video and MP3 audio in an AVI file container. However, neither DivX nor MP3 is natively supported by the QT player. (Although iTunes will natively support the MP3 audio.) Therefore, people who wish to play such files in the QT 7 Player would normally install either the DivX component or Perian but not both. Either installation will independently play such files in the QT Player, but if both are installed, the file will usually stop working since these two codecs can create a playback conflict.
    However, the AVI container could just as easily contain DV along with DV audio. In this case, the file should play correctly in QT since this compression format is natively supported by the basic component configuration that comes in every current OS installation. Therefore, if such files suddenly stopped playing, this could be an indication that a component has been moved or deleted or that your system or QT embedded structure has become corrupted.

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