We done a lot of shows exporting 10 bit DPX legal level from Avid that goes to our dub etc... facility for IMF creation. The last two shows looked milky and today we visited the facility and sure enough The IMF had been scaled Full Range to Legal when the DPX was already legal level. Hence the milky and lower highlights. We put up the DPX and they compared it to a proresHQ we had using Resolve sure enough the DPX had elevated blacks and lower highs. I went home and experimented. If I bring the Avid exported DPX legal level into Resolve I have to go to clip attributes and set it to video not Auto or Full and then the level is correct. So Resolve's Auto setting doesn't understand an Avid legal level DPX.
I went back and re-exported setting it to to Full range on the DPX export and that DPX comes into Resolve and shows correct level in auto and Full. What's even more confusing is if I ama link to these test dpx sequences in Avid there is a slight different but not nearly what I'd expect from full range to legal. Also playting the dpxs in Black Magic Express both the legal and full range dpxs look very similar. I see a bit of jump on the vector dots on color bars but not what I'd expect to see.
So when exporting DPX and clicking scale to Full is that just a metadata flag or is it really scaling the video essence? I've had similar questions like this over the years. I had thought the DPX format would include header metadata that would tell a system what level the content is. Clearly Auto doesn't get the message when Avid exports a legal level DPX. It can be manually overridden but the dub place didn't catch this.
This is what you get when you mandate a delivery file doesn't have bars and tone. This should have been caught but if there was bars it would have been really hard to miss.
So what's up Avid? Is there metadata missing in your DPX exports that would tell Resolve the proper level to handle this. I know we always have to keep tabs on proper scaling but I thought DPX was this universal foolproof system. Now I feel like a fool.
Hell if Black Magic Express plays the DPX correctly why doesn't Resolve get the level right without having to manually choose clip attribute video level. I want my frigging SR deck back with a 4K option. Heck they are cheap enough couldn't somebody gang four decks together for 4K Quad Link?
Does anyone know of any software that can parse data from a DPX file like what the level is Full or Legal? Media Info doesn't seem to do this.
I've also had similar issues with Clipster but not with DPX to my knowledge. I don't know if the Dub house has started using Resolve to make the IMFs now but before they were using clipster to my knowledge.
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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