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kennys90249149
Participant
June 28, 2019
Question

Delivering for a Broadcaster

  • June 28, 2019
  • 1 reply
  • 957 views

Hello everyone,

I'm preparing a film delivery for a broadcaster, below are required specifications, it's all quite clear except for the ones in red:

Codec: XDCAM HD422

Colour Sampling: 4:2:2

Bitrate: 50Mbps (CBR)

GOP : Long GOP

Bit depth: 8 bits

Resolution: 1920 X 1080

Interlaced: yes

Frame rate: 25 fps

Field dominance: Top Field First (TFF)

Gamma & color space:  ITU-R BT.709-5

Luminance Levels: 0mV to 700mV

Luminance Tolerance (EBU R103-2000):  -1% to 103%

Here's how my export settings panel looks like:

Can anyone help me on how I can meet those specs in red?

Cheers & thanks

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1 reply

Legend
June 28, 2019

If you check the box that says 'force fixed length GOP' you may get some choice(s). I don't have your version of CC so I can't check it out.

Group Of Pictures ( GOP), as you know, refers to compressed codec 'range' between specifically targeted frames that are completely mapped per pixel exactly rather than 'guessing' by the algorithm and throwing away specific pixel / location data that haven't changed frame by frame. That gets the compression routine back to REAL frame reality re: pixels and locations and values ..

I think normally 12 is cool for N frames …

Group of pictures - Wikipedia

Your codec choice probably has this 'built into it' but you can probably change it checking that box, I have no clue. Sorry.

The color space is probably rec 709 gamma 2.4 that they want. From what I hear PPro does that automatically in it's working program monitor space so what you see should be what you get for broadcast.

Your scopes tell you the levels of luminance.. 0 is black and 700mv is white.  It's based on an IRE scale ( old school TV land ) where the voltage of the electons hitting the back of a CRT determines the brightness, etc.

That's the 'normal range' of luminance. Sometimes an occasional 'burst' of closed black ( below 0 ) and really blown out white ( above 700 ) can be accepted... but those are like short lived.

In YOUR scopes, that would be translated to maybe something different ( TV safe ).. Other people here know more about this stuff than I do, but that's the basics...

P.S. you are probably wanting to export 25 Psf … progressive segmented frames .. which is maybe the codec you have selected... don't know..

Others will chime in. I'm sure there are tons of people shooting with their telephones who go to broadcast.