Helix Broadcaster 100 Touch Screen User Guide
CHAPTER 4: Video and Audio Options
27
Scaling Mode
The
Scaling Mode
settings are currently not functional. If the input and output aspect ratios
differ, Helix Broadcaster increases or decreases the video size as necessary to fit the output
settings. This can cause visible distortion. The following figure illustrates a 16:9 video changed
to a 4:3 aspect ratio, which compresses the video image in its horizontal dimension.
Framerate
The video frame rate determines how many visual frames are encoded for display each second.
The
Framerate
drop-down provides several choices for altering the frame rate in the output.
Video streamed over the Internet is typically encoded at a frame rate of 15 to 30 frames per
second, although lower-bandwidth videos may be encoded at slower frame rates. The default
value, which preserves the input frame rate, is
Keep Source Framerate
.
Framerate
Downsampling or Upsampling
The downsampling and upsampling values allow you to change the input and output frame
rates among those used in film and video production:
feature film
24
frames per second
PAL video
25
frames per second
NTSC video
30
frames per second