Support automatically processing a wider range of MXF audio channel configurations

[aburkleaux-amazon]

MXF could contain multiple channels that use different configurations for different purposes. In order to automatically process these inputs, MIE should use MediaInfo to analyze the configuration of the packaged media and then adjust the settings for the MediaConvert proxy encode to extract the correct audio for downstream content analysis.

So, here are a few common scenarios:

MIE works:

• Channel 1 to 6 are 5.1 channels.  this case you would be ok.

MIE doesn't work:

• Channel 1 & 2 are L & R; Channel 3 & 4 are Audio Description tracks
• Channel 1 & 2 are English; Channel 3 &4 are Spanish  NG
• I also came across file that contains test tone signal track (for timing, I believe)  NG

MediaConvert downmix channels into stereo by default. As you can imagine, you get very mixed up stereo output and that would affect the rest of the workflow like Transcribe and Comprehend.