Texas Instruments TMS320DM6437, Руководство по началу работы, Страница: 28 / 64

Running the Demos with the PC Host Application
3-8
8) In the Video Settings area, choose the video codec and its properties
for the current demo mode. You can select H.264 or MPEG4
encoding and decoding. Optionally, you can set a custom frame rate
and/or encoding bit rate (either a variable or constant bit rate). For the
encoding resolution, you can select full image or quarter image for
NTSC and PAL.
When you select a file for decoding or encoding, the codec selection
changes automatically based on the file extension. Verify that the
selection is correct before running a decode or encode operation.
Note: It is possible to choose settings that result in sub-optimal
video quality or that overrun the available MHz of the processor.
There are no automatic checks against non-optimal parameter
settings, so you should carefully choose settings and examine the
resulting video output quality and DSP performance load against
the design requirements. For example, it is not recommended to
set the bit rate lower than 2 Mbps if you are using the H.264
encoder at D1 resolution.
The host application provides these controls for experimental
purposes. They allow you to experiment with the limits of
performance and quality. If you experiment with them, keep in mind
that some settings will necessarily degrade performance and quality.