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Using ATEM Software Control
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Setting the Down Converter Style
Setting the Media Pool Clip Length
Setting the Down Converter Outputs
When running ATEM Production Studio 4K models in Ultra HD 4K, the HD-SDI program output always
outputs down converted high definition 1080i video for connection to HD-SDI equipment. High definition
or standard definition video inputs are always output as HD or SD video respectively.
ATEM Television Studio does not have any down converted outputs.
When running the ATEM 1 M/E and 2 M/E production switchers in high definition, the HD signal is
permanently down converted to SD via SDI and composite video outputs for connection to older devices.
720 50p and 1080 50i down converts to 625 50i PAL. 720 59.94p and 1080 59.94i down converts to 525 59.94i
NTSC.
Down conversion provides the following aspect ratios:
Center Cut
Crop left and right side making a 4:3 image.
Letterbox
Scales the video down with black bars to top and bottom.
Anamorphic
Horizontal scale (squeeze) to make 16:9 image fit 4:3. Requires an anamorphic or
16:9 monitor or television to correct the aspect ratio.
Adjusting the Media Pool Clip Length
For models that support media clips, the Media Pool features two clips that share the same pool of memory.
By default, each clip receives half of the available memory which determines the maximum number of
frames. If you need a clip to be longer, adjust the balance of frames. It's worth remembering that lengthening
one clip will shorten the other.
Clip Length Table
ATEM Switcher
ATEM 1 M/E and 2 M/E
1080i
Production Switcher
720p
SD
ATEM 1 and 2 M/E Production
Ultra HD 4K
Studio 4K
1080i, 1080p
720p
SD
Video Format
Clip Length
180 frames
360 frames
900 frames
180 frames
720 frames
1600 frames
3600 frames
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