Adobe Premiere Pro CC v.7.xx - Manual (Page 564)

Note:
Modem NTSC 4 x 3
Modem PAL 4 x 3
T1/DSL/Cable NTSC 4 x 3
T1/DSL/Cable PAL 4 x 3
When you deliver video over the Internet, produce files at lower data rates. Users with fast Internet connections can view the files with little or no
delay for loading, but dial-up users must wait for files to download. Make the clips short to keep the download times within acceptable limits for
dial-up users.
Select the proper frame rate
Frame rate indicates frames per second (fps). If you have a higher data rate clip, a lower frame rate can improve playback through limited
bandwidth. For example, if you compress a clip with little motion, cutting the frame rate in half can save you only 20% of the data rate. However, if
you compress high-motion video, reducing the frame rate has a much greater effect on the data rate.
Because video looks much better at native frame rates, leave the frame rate high if your delivery channels and playback platforms allow. For web
delivery, get this detail from your hosting service. For mobile devices, use the device-specific encoding presets and the device emulator available
through Adobe Media Encoder in Adobe Premiere Pro. If reducing the frame rate, the best results come from dividing the frame rate by whole
numbers.
To embed video clips into a SWF file, match the frame rate of the video clip to the frame rate of the SWF file. To encode video using the
frame rate of an FLA file, use the Advanced Video Encoding settings in the FLV Import wizard.
Select a frame size that fits your data rate and frame aspect ratio
At a given data rate (connection speed), increasing the frame size decreases video quality. When you select the frame size for your encoding
settings, consider frame rate, source material, and personal preferences. To prevent pillarboxing, choose a frame size of the same aspect ratio as
the frame aspect ratio of your source footage. For example, pillarboxing results when you encode NTSC footage to a PAL frame size.
Adobe Premiere Pro makes several FLV and F4V file presets available through the Export Settings dialog box. These include preset frame sizes
and frame rates for the different television standards at different data rates. Experiment with the various Adobe Media Encoder presets to find the
best setting for your project. Use the following list of common frame sizes (in pixels) as a guide:
162 x 120
160 x 120
648 x 480
768 x 576
Stream for best performance
You can stream FLV and F4V files to eliminate download time. FLV and F4V files also have deep interactivity and navigation capabilities when
they are streamed. Streaming FLV and F4V files allow you to monitor quality of service. You can stream FLV and F4V files with the Flash Media
Server. Alternatively, you can use a hosted service from one of the FLV/F4V Streaming Service partners available through the Adobe website. For
more information, see “Delivering Flash Video: Understanding the Difference Between Progressive Download and Streaming Video” on the Flash
Developer Center website.
Cover progressive download times
Learn how long it takes to download enough of your video so that it can play to the end without pausing to finish downloading. While the first part
of your video clip downloads, you can display other content that disguises the download. For short clips, use the following formula: Pause =
download time – play time + 10% of play time. For example, if your clip is 30 seconds long and it takes 1 minute to download, give your clip a
33-second buffer. The applied formula is 60 seconds – 30 seconds + 3 seconds = 33 seconds.
Remove noise and interlacing
For the best encoding, remove noise and interlacing.
The higher the quality of the original, the better the final result. Frame rates and sizes of Internet video are smaller than frame rates and sizes of
television video. However, computer monitors typically have color fidelity, saturation, sharpness, and resolution at least as good as high-definition
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