Forum Question: Quicktime and MPEG 4 sizes

Gary can you explain to me why are Quicktime movie file are larger than a MPEG 4 file? I export from IMovie 11.
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Richard

Comments: One Response to “Quicktime and MPEG 4 sizes”

    10/26/10 @ 10:09 pm

    Both QuickTime (.mov) and MPEG 4 (.mp4) files are containers for video. The video itself can be compressed in a variety of ways, with a variety of different settings. For instance, you can use h264, Photo JPEG, Animation, 3ivx, etc., as compression types. In addition, many types allow you to set bit rates (the amount of disk space to use per second). So you can have h264 limited to 500 kbps (kilobits per second) which will be half the size of h264 limited to 1000 kbps. The audio track is also set to a compression type and bit rate.
    So, it depends on the settings you are using. You can make QuickTime and MP4 files of almost identical size if you use identical settings.

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