make dnxhd quicktimes (10 bit) with avwriter

[Matt Kitcat]

Hi All

Can someone give me an example of how to make an Avid DnxHD from an image sequence of open exr image? I have been struggling to understand the documentation and can't quite figure it out.

Thanks

[Marie F.]

Hey Matt,

Did you try something like:

sam do colorwheel format=HD explicitConversion=16 // avwriter /tmp/test_dnxhd_115M.mov useCustomFps=True customFps=24 format=mov videoCodec=dnxhd  b=115000000 colorspace=1 // -r 1,100

What's your version of TuttleOFX, did you build it yourself ? If not, what binaries are you using ?

Don't hesitate to post here cmd lines you're trying and what error you get.

++

Marie

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[Matt Kitcat]

Thanks for the reply.

based on your example I am trying this:

/usr/src/tuttle/sam do tuttle.exrreader /home/public/16_9/16_9_#####.exr   // avwriter /home/public/test_dnxhd_115M.mov useCustomFps=True customFps=24 format=mov videoCodec=dnxhd  b=115000000 colorspace=1

and here is the error:

LD_LIBRARY_PATH: :/usr/src/tuttle/lib

getRegionOfDefinition 1920 x 1080

        >-- /home/public/16_9/16_9_0000.exr

        --> /home/public/test_dnxhd_115M.mov

avWriter: pixel format yuv420p not available in codec

avWriter: auto-selecting yuv422p

unknown error

__________

Error: avWriter: unable to write header.

I downloaded the 64 bit production binary. I am using Fedora core 21

Incidentally I can make pro-res using this command without errors:

/usr/src/tuttle/sam do tuttle.exrreader /home/public/16_9/16_9_#####.exr rgb  // tuttle.colorgradation in=Linear out=Rec709 // tuttle.avwriter /home/public/prores1.mov mainPreset=prores-hq useCustomFps=1 customFps=24.00 

[Marie F.]

Your input sequence is 1920x1080, right ?

If not, as Clément says in the other mail thread, dnxhd is indeed constrained to very specific resolutions: http://en.wikipedia.org/wiki/List_of_DNxHD_codec_resolutions

So you may have to add a resize node before the write node.