I'm trying to use AMT to create new AMT clips, create tracks within those clips and then write samples to the tracks. Initially, I was using the same media properties for the clip and the samples, and everything seemed to work fine (probably because no transcoding was required). Then I tried changing the output format of the clip to force a transcode and this is where I've run into a few issues with the transcode being unsupported.
In one test, the only difference between the two formats was the number of audio bits. The sample media properties used was the supplied example dnxhd_1080i_2997_145.XML. The output media properties I used is:
<?xml version="1.0" encoding="ISO-8859-1" ?><!-- Copy of dnxhd_1080i_2997_145.XML with the following alterations: - Audio tracks changed to 16 (8 channel stereo) --><AmtMediaAttributes><format><mediaFormat>Compressed</mediaFormat><signalStandard>SS_274M_I</signalStandard><dropFrame>kAVXFalse</dropFrame><compressionType>Avid::HD::DNxHD</compressionType><dnxhdMbitsPerSecond>145</dnxhdMbitsPerSecond><dnxhdComponentBits>8</dnxhdComponentBits></format><timecode>01:00:00:00</timecode><bitRateMode>CONSTANT BIT RATE</bitRateMode><framesPerSecond>29.97</framesPerSecond><storedHeight>540</storedHeight><storedWidth>1280</storedWidth><audioTracks>2</audioTracks><audioBits>24</audioBits><audioBitRate>48000</audioBitRate><audioCompressionType>Avid::WAVE::Uncompressed</audioCompressionType><extendedAttributes></extendedAttributes></AmtMediaAttributes>Using these, I get the error AMT_UNSUPPORTED_TRANSCODING_REQUEST when creating the clip, indicating that this is probably an error from the codec manager when it's initialised with the two formats (nb I have loaded the plugins).
I cannot find anywhere that details the format of these media property files, what values can be used for certain tags (eg compressionType in this example is Avid::HD::DNxHD but what other options are there), and exactly what transcode operations are/aren not supported.
Anyone had any luck or know where I can find more information?
Thanks!