Apple QuickTime 7 Manual de usuario descargar pdf (Pagina 50)

50 Chapter 4 Exporting Files With QuickTime Pro

Â 3G timed text

Â 3GPP2 is for CDMA 2000 networks. With this format, you can use:

Â MPEG-4, H.263, or H.264 video

Â AAC, AMR, or QCELP audio

Â 3G timed text

Â Movie fragments (enables playback to start sooner for longer movies, since only the

fragment, not the whole movie, must fit on the handset)

The remaining formats are provided for specific networks. With these formats, you can

restrict distribution so that a file can’t be shared from the recipient’s phone (set this

option in the Advanced pane). These formats may limit the acceptable file size or data

rate; check with the service provider for more information.

Â 3GPP (Mobile MP4) is for NTT DoCoMo’s “i-motion” 3G service. With this format, you

can use the 3GPP options described above.

Â 3GPP2 (EZmovie) is for KDDI’s 3G network service. This format provides the same

options as 3GPP2 (described above), except for AMR audio support.

Â AMC (EZmovie) is for KDDI subscribers with AMC-capable phones. With this format,

you can use:

Â MPEG-4 video

Â QCELP audio

Â KDDI’s text format

3G Video Export Options

Â Video Format: If your source movie has only one video track and it is already

compressed, you can choose “Pass through” (so that the video doesn’t get

compressed again).

Â Data Rate: The more kilobits per second (kbps), the better the movie quality. For

best playback, however, don’t choose a data rate higher than the available

bandwidth.

Â Optimized for: If you choose H.264 from the Video Format pop-up menu, choose

your intended delivery method from the “Optimized for” pop-up menu. This setting

tells the codec how much the data rate can vary above and below the data rate you

choose.

Â Image Size: If you’re sending the file to a mobile phone, choose one of the

standards. Current maintains the source material size; the resulting file may not play

on a mobile phone. To choose a size not listed in the pop-up menu, choose Custom.

Â Frame Rate: In most cases, your video will look better if you choose a number that is

exactly divisible by the FPS (frames per second) of your source. For example, if your

source is captured at 30 FPS, choose a frame rate of 10 or 15. Don’t choose a rate

larger than that of your source material.

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