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importing 24P gfx: what settings are optimal?
When we set up our HD- 24 p projects in our Symphony nitris, there are video resolution options of:
DNXHD 115 MXF (which we always use), as well as:
DNXHD 175 MXF
DNXHD 175 X MXF
1:1 MXF
1:1p 10 bit MXF
We’ve always used DNXHD 115 MXF when importing 24p gfx,as well. When we are in HD projects, we import HD gfx at 220x MXF rather than the standard DNX HD 145 setting we use when digitizxing HD media.
Is there a reason to use any of these other 24 p settings above when importing 24P HD gfx? (for instance, DNXHD 175X MXF). I;ve tried importing 24P gfx at the other rez’ above, and see no discernable difference in levels or quality.
I have little 24p experience;thus the question.
Thanks for the knowledgable answers any of you may enlighten me with!
Rob
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2 Replies
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Rob,
I know you had this answered on the Avid community forums, but I wanted to add my thoughts. First off, the 220 DNxHD is in 59.94 projects and equals the 175 in 23.98 projects. They are the exact same Data rates and level of compression, the 175 is a lower number as it has less frames to deal with in 23.98.
Second, the “X” at the end denotes 10 bit vs. the standard which is 8 bit. This is a very significant difference as there can be a lot of “banding” (you can find an example of banding here: https://www.moviola.com/bit_depth_article ) in 8 bit that won’t be there in 10bit. This is especially true in graphics as they often contain gradients of the same color which is where banding becomes obvious. You may not be noticing a difference if you are watching on an 8-bit LCD or a CRT.
If the graphics were created in 8-bit, or the file format they were stored in is 8-bit, then this doesn’t matter.
Terence Curren
http://www.alphadogs.tv
http://www.digitalservicestation.com
Burbank,Ca -
Thanks so much Terrence. Now I know for certain we will be importing our 24p gfx at 175x….
Rob
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