My current 4K project was shot with multiple Panny Varicam35 cameras. Here is a Media Info report of the material:
Writing application : Panasonic P2 3.0
Video
ID : 2
Format : AVC
Format/Info : Advanced Video Codec
Format profile : High 4:2:2 Intra@L5.2
Format settings, CABAC : No
Format settings, GOP : N=1
Format settings, wrapping mode : Frame
Codec ID : 0D010301020E0000
Duration : 2mn 20s
Bit rate : 321 Mbps
Width : 4 096 pixels
Height : 2 160 pixels
Display aspect ratio : 1.896
Frame rate : 23.976 (24000/1001) fps
Standard : Component
Color space : YUV
Chroma subsampling : 4:2:2
Bit depth : 10 bits
Scan type : Progressive
Bits/(Pixel*Frame) : 1.513
Stream size : 5.24 GiB (98%)
Color range : Limited
Color primaries : BT.709
Transfer characteristics : BT.709
Matrix coefficients : BT.709
Video
ID : 2
Format : AVC
Format/Info : Advanced Video Codec
Format profile : High 4:2:2 Intra@L5.2
Format settings, CABAC : No
Format settings, GOP : N=1
Format settings, wrapping mode : Frame
Codec ID : 0D010301020E0000
Duration : 2mn 20s
Bit rate : 321 Mbps
Width : 4 096 pixels
Height : 2 160 pixels
Display aspect ratio : 1.896
Frame rate : 23.976 (24000/1001) fps
Standard : Component
Color space : YUV
Chroma subsampling : 4:2:2
Bit depth : 10 bits
Scan type : Progressive
Bits/(Pixel*Frame) : 1.513
Stream size : 5.24 GiB (98%)
Color range : Limited
Color primaries : BT.709
Transfer characteristics : BT.709
Matrix coefficients : BT.709
From the Panasonic website here are the potential recording formats:
Video Compression Format
AVC‑Intra4K 4:2:2/AVC-Intra100: MPEG-4 AVC/H.264 Intra Profile, AVC‑LongG50/AVC‑LongG25: MPEG-4 AVC/H.264
Based on this info they must have shot to the AVC-Intra4K 4:2:2 right? Given the Format profile from MediaInfo is "High 4:2:2 Intra@L5.2" that is what I think. I'm not sure what the "@L5.2" represents. I assume that the "Format Settings, GOP : N=1" means the GOP structure is only 1 frame hence the "Intra" all I frame in the Format Profile listing.
So given all this is there any quality reason that the ultimate IMF file has to be made from a .dpx export of the above mentioned material? The media is never going to be more than it started as from a video quality standpoint. Color correction may create more subtle image aspects that I suppose would be better maintained exporting to a .dpx file format but I would think that would be virtually undetectable to the viewer.
This leads to crux of my curiosity in that I'm required to create a .dpx from the above material so that can be used to create the ultimate IMF file. I have been told indirectly that the IMF file will be made using Clipster and I've also been told indirectly, meaning not by the actual facility making the IMF, that Clipster can not make an IMF from an Avid DNxHRHQX file format. Can anyone confirm this?
It just doesn't make sense to me that given the original source material I don't see how Avid DNxHRHQX would be in any way deteriorating the image quality. I would think it's basically maintaining everything that's in the original material. So is it just that that Clipster can't handle a DNxHR codec, which seems strange to me, or am I once again dealing with the McDonald's "I don't have a button for that and I've never done it that way mentality?" The facility that will make the IMF is no small shop so I really doubt that but I've never worked on a Clipster so I don't know all it's capabilities. Could it be like many hardware/software solutions that DNxHR codec capability is a paid option for Clipster? Given the separate QC facility is unwilling to take 5 minutes to load the Avid LE codecs to QC the file and is requiring me to make prores I'm just getting fed up with these "Service Companies" providing a service but not being of service in even a minimal way to us the client. We are also dealing with preferred vendor status requirements which are anything but preferred on our end. Our normal QC facility is willing to do anything we need to QC our file in the hopes to gain preferred vendor status. Sadly the preferred vendor we are dealing with, at least for initial QC is just the opposite.
John Moore Barking Trout Productions Studio City, CA bigfish@pacbell.net
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Posted by: John Moore <bigfish@pacbell.net>
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this is the Avid-L2
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