Type 1 and Type 2 AVI question

Discussion in 'Amateur Video Production' started by Brian, May 1, 2004.

  1. Brian

    Brian Guest

    I'm trying to understand the difference between a type 1 and type 2
    avi file.
    It looks like there are more video editors that support a type 2 avi
    file. Is there any advantage in saving a video in type 1 avi?

    Is a mpg2 compiled from a type 1 avi file that same as a mpg2 compiled
    from a type 2 avi file?

    Regards Brian
    Brian, May 1, 2004
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  2. " Type-1 vs. Type-2 DV AVI Files
    DV cameras produce interleaved audio-video; each frame of video also
    contains the audio information. If you save DV data to an AVI file, you have
    a choice:

    a.. Store the interleaved data as one stream in the AVI file. This is
    known as a type-1 file.
    b.. Split the interleaved data into separate audio and video streams. This
    is known as a type-2 file.
    For video capture, where maximum throughput is crucial, it is better to use
    a type-1 file, because type-2 files carry redundant audio data. (The video
    stream still has the audio data. The audio is simply hidden by labeling the
    stream as video.) Also, writing a type-2 file requires some additional
    processor time to split the interleaved stream.

    On the other hand, type-1 files are less efficient for real-time editing.
    The application must extract the audio from the interleaved stream, make the
    edits, and interleave the data again. Also, the type-1 format is not
    compatible with Microsoft® Video for Windows® (VFW). DirectShow can handle
    both types of files. "

    (from a Microsoft web page.)

    As you can see, AVI 1 has the video and audio interleaved in the one file.

    Robin Davies-Rollinson, May 1, 2004
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