Hi All

  I am trying to use AMT3 (version 5.2.2) to write an uncompressed video file to be used as an alpha channel for a video file.  I have found a number of MADs that are accepted by the AMT interface, but none of them allow me to actually write the uncompressed frames.  I am initially trying to setup for 'DNxUncompressed Standard Format' or 'Uncompressed' 8 bit YUY2 4:2:2 format.  The sample in the SDK uses "Uncompressed" and when I extract a MAD from a MC AAF, it uses "DNxUncompressed Standard Format".  In either case, the data is the same.  The closest I have gotten still gets an exception after adding a few frames

Microsoft C++ exception: GH14::Av::Generic::Exceptions::InvalidFormat at memory location

and in the extended debug, it has 

DEBUG - Unable to compute common estimated essence size for Unknown picture type

and this is using the 'DNxUncompressed Standard Format' MADs.  Any thoughts would be greatly appreciated.

http://www.drastic.tv/downloads/avid/MADTests.zip

In AMT3 there is a difference between essence description and target/encoding settings. 'DNxUncompressed Standard' is the description of a specific encoded essence format. As target/encoding format setting, only the label "Uncompressed" is supported. This works as expected on our side.