Film-Tech Forum ARCHIVE: Extracting frames from DCP

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Posted by Walter Rabey (Member # 5968) on 09-17-2011, 09:32 PM:

Hi Everyone,

First post here on the forums!

I was wondering if anyone knows of a practical way to extract the frame sequence from a DCP (not encrypted). I have already worked out the process in creating DCP's, but going the other way, I have not had much luck finding anything which can both extract the frames, and preform the XYZ->RGB colour space conversion. I know EasyDCP Player+ can do this, but it's far too expensive for me.

Thanks!

Posted by Scott Norwood (Member # 30) on 09-18-2011, 08:18 AM:

I have not yet actually done this, but look at the docs and source code for OpenDCP and you will get a pretty good idea of how to unwrap the MXF file and convert the colorspace and file types of the jpeg2000 image files. This should all be easily do-able with open-source tools, as long as the DCP is unencrypted.

If you can't figure it out in a couple of days, post here and I will see what I can do to help. I am sort of swamped at the moment, however, and am still playing with DCP creation tools.

Posted by Dominic Espinosa (Member # 2122) on 09-18-2011, 11:03 AM:

I think asdcptest from one of the open dcp tools can do it.
Otherwise I've done it with FFMpeg and convert from the ImageMagick suite.

ffmpeg -i /location/source.mxf -vcodec tiff frame%8d.tiff

Then make a batch or shell script to loop through each frame and run this command:

convert /location_of_frames/framenumber.tiff -type TrueColor -alpha Off -gamma -0.454545 -recolor "3.2404542 -1.5371385 -0.4985314 -0.9692660 1.8760108 -0.415560 00.556434 -0.2040256 1.0572252" -gamma 2.6 output_location/franenumber.tiff"

Then do what you will after that.

If you're hoping to re-encode to AVI or something watchable on your PC or what have you mind the entrypoints in the CPL's as audio and video can have different ones which will throw you off sync.