Thursday, March 26, 2015

RE: [Avid-L2] Finally a blanking QC note?

 

One of the executives catch phrases is, "Hey we're not doing Avatar!!!"  What's surprising to me is the QC folks at Technicolor are use to working on things like Avatar and they passed this show.  It's the distributor who is flagging one line of vertical blanking and horizontal blanking is within any conventional spec.  It's much less than the blanking on our DVCProHD cameras and we deliver that alll the time.  The flaggin is more a result of the one camera having a difference from the other cameras but I'm still surprised that the Silverlight player isn't cropping the edges enough to mask edge anomalies which have always existed and why many monitors have setting to slightly overscan etc....



---In avid-l2@yahoogroups.com, <kwikpasta@...> wrote :

I routinely fail things for blanking issues over here in the UK.  1 pixel down the edge or one line at the top is enough to send it back to the editor.  Personally I feel it can be overkill but it's what I'm told to do so I do it.  It's more about arse-covering than anything else.  If we're sending something on to BBC worldwide or wherever we don't want it coming back as it affects our status as a preferred supplier and you never know what kind of jobsworth you get further down the chain complaining about dead pixels, audio clicks etc.  When I do a QAR report for these places we put on a huge amount of extra detail regarding all manner of pointless things like chromatic aberration on high contrast edges etc, things that are just natural results of filming but that some people will flag up as errors, just so that we can point to our report if someone tries to fail it and say "look, we mentioned it on the report and it's signed off".  I've sent 4 page long QARs before just listing endless examples of stuff that is deemed to possibly arouse the ire of some QC monkey (as you like to call us John! ;)) further down the line.  For me it's about common sense but not everyone is able to put things in context and say actually that's fine, don't worry about it. 

Silverlight I have no idea about but to be honest I do tend to notice blanking errors more when I'm watching on a player with a very definite digital edge so ultimately I do agree that all the blanking issues should be fixed if they're spotted and especially on older shows or archive material because you know to expect it.  Nothing ruins my day like a soft edged pillarbox!

Andi


To: avid-l2@yahoogroups.com
From: Avid-L2@yahoogroups.com
Date: Thu, 26 Mar 2015 02:34:01 +0000
Subject: [Avid-L2] Finally a blanking QC note?

 

So today's stroll down QC corner involve H and V blanking.  This is a file with CLAP Atom removed a.k.a. no clean aperture.  This file passed Technicolor QC after a few rounds but now is being flagged at the distribution provider because one of the Arri Cameras, Alexa and Amiras not sure which type is being flagged for what I can only measure as one line of vertical blanking at the top of field 1.  and an ever so slight, much less than dvcproHD tapes we deliver without issue to cable networks, amount of horizontal blanking.  It's virtually a one line spec of black at the top and left edge of active picture.  I measured and Vertically on the flagged camera starts active picture on line 22 Field 1 and line 21 Field 2.  The unflagged cameras start active picture on line 21 on both Fields 1 and 2.  This is 23.976 1080P delivered as ProResHQ 422.  I will blow up the one camera but it just seems like overkill.  I feel like the slight blow up is much more degrading to the image than one very slight line of black at the top of frame.

I'm being told it is a concern about the "SilverLight Player" viewer might be using to watch the show.  It was described as having a black border on the player that makes even this small blanking issue jarring.  Has anyone been hit with this stringent a concern on blanking.  I haven't been hit with blanking in a long time.  I find it hard to believe that this internet streaming service doesn't have some sort of aperture correction to avoid edge of frame issues.  This is 1080P but they also serve up older TV shows etc... that must have much more blanking issues than this which really seems like a non issue to me.  Curious what hoops others have gone through and if anyone has more experience with the gotchas of Silverlight playback interface.
 
John Moore
Barking Trout Productions
Studio City, CA
bigfish@...

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