for (i=0; i<folderInfo.Coders.size(); i++) {
CoderInfo coderInfo = (CoderInfo)folderInfo.Coders.get(i);
AltCoderInfo altCoderInfo = (AltCoderInfo)coderInfo.AltCoders.firstElement();
if (coderInfo.IsSimpleCoder()) {
ICompressCoder decoder = getSimpleCoder(altCoderInfo);
this._decoders.add(decoder);
if (this._multiThread) {
// _mixerCoderMTSpec.AddCoder(decoder);
// has already ben checked above