I believe DPX 10bit requires packing(you take 4 samples, 10 bits ea. and assemble them into 5 bytes, which would match the storage pattern).
Depending on the implemetation, that could be a bit of overhead at the rendering/packing side.
BG
www.finale.tv
From: "John Moore bigfish@pacbell.net [Avid-L2]" <Avid-L2@yahoogroups.com>
To: Yahoogroups <avid-l2@yahoogroups.com>
Sent: Wednesday, December 7, 2016 1:15 PM
Subject: [Avid-L2] Curious DPX Export Observation
Yesterday my DPX export crashed presumably because the Raid Tower I was exporting to unmounted. Have no idea why the stuff happens. I was able to ama link to the partial dpx export and found that only the last frame was damaged. I deleted that last frame and re ama linked to the dpx clip. I export with frame numbers based on time code so that allowed me see where I should pick up the dpx export. I even used a calculator to confirm the frame count. That left me with 6.5 hours of export.
Of course then there is another problem with audio sync on another 4K project so now I had to abort the restarted DPX export. No biggie as I'd already figured out how to pick things up. Well after addressing the audio issue I went back to the DPX export and picked it up but now the time projected, which should have been around 4.5 hours given where I left off was listed in the progress bar as 2:18 which seemed about half the time that should be required.
I got nervous that I had missed a setting so I aborted and deleted the current export batches frames. I went back through all the dpx export settings and made sure I set it to 10 bit not the default 8 bit setting. Then when I restarted the DPX export the projected time was around 5 hours which is more what I would expect. The catch here is Avid resets the DPX export settings to default every time you initiate the ama file export. Even if you haven't left the project so every time I restart I have to set it to use time code for frame count, set it to 10 bit not 8 bit and click keep levels legal not the default scale to Full Range. It does seem to remember the Use Marks and Use Selected Tracks check boxes as long as you haven't restarted Avid.
Given the shot 2:18 projected time I got I speculate I had missed the 10 bit setting and it was outputting DPX at 8 bit. Given these reset each time you open the ama file export box I have no way of knowing if that's what happened but I suspect it did. I am surprised exporting DPX 8 bit would be that much quicker than DPX 10 bit. The timeline is completely rendered to ProResHQ from DNxHRHQX media and the original cameraa media was 10 bit YUV AVC-Intra. So I would think that the ProResHQ Safe Color Limit effect render is 10 bit. Just curious why 8 bit DPX export is soo much faster than 10 bit given my source material is 10 bit. All kinds of fun in the 4K world. Maybe it's even 4 times more fun and I just don't know it.
John Moore Barking Trout Productions Studio City, CA bigfish@pacbell.net
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Posted by: Bogdan Grigorescu <bogdan_grigorescu@yahoo.com>
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