[Avid-L2] Re: Epic 5K 4800x2700 5K Footage and Frame Flex for Transcode?

 

The first file has processed and in the bin it still lists the raster size at 4800x2700 but when I take the .mxf file into Media Info it lists the file as 4096x2160, which matches the project format.  I assume Avid somehow keeps track of the original size dimensions so that any frame flex manipulations will translate properly in the end.  Media Info also lists the aspect ratio as 16:9 which is in fact the original aspect ratio of the 5K Red footage but if it is now 4096x2160 that's 1.9:1 not 106:9 ratio.  Is Avid somehow creating anamorphic pixels in the transcode process that a program like Media Info and other player software would recognize? 

Here is the Media Info specs in the Video category:

Video
ID : 3
Format : VC-3
Format settings, wrapping mode : Clip
Codec ID : 0D01030102110200-0401020271250000
Duration : 1h 26mn
Bit rate : 746 Mbps
Width : 4 096 pixels
Height : 2 160 pixels
Display aspect ratio : 16:9
Frame rate : 23.976 (24000/1001) fps
Color space : YUV
Chroma subsampling : 4:2:2
Bit depth : 12 bits
Scan type : Progressive
Bits/(Pixel*Frame) : 3.515
Stream size : 448 GiB (100%)
Title : V1
Matrix coefficients : BT.709

---In Avid-L2@yahoogroups.com, <bigfish@...> wrote :

On my Red 4K 4096x2160 project of course the second shoot was shot at 5K 16:9 not 1.9 Aspect Ratio.  I ama link to the media and I set frame flex to 1.9:1 from the default of 16:9 for the media.  I am transcoding to DNxHRHQX using Camera Metadata and a Full Range to Legal Scaler along with the aforementioned Frame Flex setting.  I am not baking anything in on the transcode.  I just started the process but I'm curious will the resulting DNxHRHQX transcodes be 4096x2160 or will the maintain the original 4800x2700 pixel count.  We have done a similar approach on some other odd frame sizes but I haven't seen the results in online yet.  I do know on the other clips for offline when we didn't bake in the frame flex the resulting offline DNX 36 clips still displayed the full frame pixels for the odd sized clips.  I assume that will allow for a proper online conform as the frame flex parameters they might apply in offline will properly translate to online sequence.  My limited experience in this area suggests that if we bake in the frame flex it will lose track of the original medias odd frame sizes.

Can anyone clarify the workflow with Red or any other camera that shoots in odd frame sizes?

 

John Moore Barking Trout Productions Studio City, CA bigfish@...

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Posted by: bigfish@pacbell.net

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