Operation Manual

-88-
NOTE: While it is possible to expose and enumerate up to 10 filters per device, the practical number
of working filters will be less. The practical number of filters depends on the capability of the
appliance, the types of filtering enabled, the types of scaling and color format conversions requested
per encoder, and the type of processing being done. If the appliance has multiple capture channels,
the number of filters is the total across all channels. In addition, some types of processing, such as
deinterlacing and gamma corrections, which are performed once per channel may, in this case, occur
multiple times. In summary, an appliance can support 5, 6, or more concurrent filters on one device
if the processing per filter is light. However, only 2 or 3 simultaneously running filters can be
supported if the processing load inside or outside the driver is particularly heavy.
Deinterlace
The deinterlace field has four drop-down choices, as follows:
• Off — Perform no deinterlacing of any kind.
• Auto — Apply inverse telecine deinterlacing to all telecine video. Apply motion adaptive
deinterlacing to all video that is not telecine. Switch dynamically between the two modes as
the content changes. Available for NTSC video only.
• Inverse Telecine — Apply inverse telecine deinterlacing to all telecine video. Perform no
deinterlacing of video that is not telecine. Available for NTSC video only.
• Motion Adaptive — Apply motion adaptive deinterlacing to all video.
Deinterlace settings are applied and stored per-device and are applied to all filters and pins
associated with a device.
Motion Adaptive Deinterlace
Motion adaptive deinterlace is an algorithm for deinterlacing pure video (non-telecine) content. It
detects which portions of the image are still, which portions are in motion, and then applies different
processing to each scenario.
Telecine and Inverse Telecine
Telecine video is NTSC video, which was originally created on film at 24 frames per second. In the
telecine conversion process, certain fields are repeated in a regular, recurring sequence. If a telecined
sequence is viewed directly on a progressive screen, interlacing artifacts will be visible.
The process called Inverse Telecine is the reverse of Telecine — it drops the redundant fields and
reassembles the video in a 24 fps progressive format. Interlacing artifacts are 100% removed. If the
video is viewed at 24 fps, you will see the exact timing and sequencing that was on the original film.
If the video is viewed at 30 fps, every fifth frame will be repeated. However, there will be no
deinterlacing artifacts.