src/main/java/com/netflix/imflibrary/writerTools/IMPBuilder.java [297:330]:
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        Composition.VirtualTrack mainImageVirtualTrack = null;
        for(Composition.VirtualTrack virtualTrack : virtualTracks){
            if(virtualTrack.getSequenceTypeEnum() == Composition.SequenceTypeEnum.MainImageSequence){
                mainImageVirtualTrack = virtualTrack;
                break;
            }
        }

        if(mainImageVirtualTrack == null){
            throw new IMFAuthoringException(String.format("Exactly 1 MainImageSequence virtual track is required to create an IMP, none present"));
        }

        /**
         * Logic to compute total running time
         */
        long totalRunningTime = 0L;
        long totalNumberOfImageEditUnits = 0L;
        for(IMFTrackFileResourceType trackResource : (List<IMFTrackFileResourceType>)mainImageVirtualTrack.getResourceList()){
            totalNumberOfImageEditUnits += trackResource.getSourceDuration().longValue() * trackResource.getRepeatCount().longValue();
        }
        totalRunningTime = totalNumberOfImageEditUnits/(compositionEditRate.getNumerator()/compositionEditRate.getDenominator());

        List<IMFEssenceDescriptorBaseType> imfEssenceDescriptorBaseTypeList = new ArrayList<>();
        Map<UUID, UUID> trackFileIdToEssenceDescriptorIdMap = new HashMap<>();
        for(AbstractApplicationComposition.ResourceIdTuple resourceIdTuple : getResourceIdTuples(virtualTracks)) {
            trackFileIdToEssenceDescriptorIdMap.put(resourceIdTuple.getTrackFileId(), resourceIdTuple.getSourceEncoding());
        }
        for(Map.Entry<UUID, List<Node>> entry: essenceDescriptorDomNodeMap.entrySet()) {
            if(trackFileIdToEssenceDescriptorIdMap.containsKey(entry.getKey())) {
                imfEssenceDescriptorBaseTypeList.add(new IMFEssenceDescriptorBaseType(UUIDHelper.fromUUID(trackFileIdToEssenceDescriptorIdMap.get(entry.getKey())), new ArrayList<>( entry.getValue())));
            } else {
                imfErrorLogger.addError(IMFErrorLogger.IMFErrors.ErrorCodes.IMF_CPL_ERROR,
                        IMFErrorLogger.IMFErrors.ErrorLevels.NON_FATAL,
                        String.format("Resource = %s is not referenced in the virtual track.", UUIDHelper.fromUUID(entry.getKey())));
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src/main/java/com/netflix/imflibrary/writerTools/IMPBuilder.java [696:729]:
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        Composition.VirtualTrack mainImageVirtualTrack = null;
        for(Composition.VirtualTrack virtualTrack : virtualTracks){
            if(virtualTrack.getSequenceTypeEnum() == Composition.SequenceTypeEnum.MainImageSequence){
                mainImageVirtualTrack = virtualTrack;
                break;
            }
        }

        if(mainImageVirtualTrack == null){
            throw new IMFAuthoringException(String.format("Exactly 1 MainImageSequence virtual track is required to create an IMP, none present"));
        }

        /**
         * Logic to compute total running time
         */
        long totalRunningTime = 0L;
        long totalNumberOfImageEditUnits = 0L;
        for(IMFTrackFileResourceType trackResource : (List<IMFTrackFileResourceType>)mainImageVirtualTrack.getResourceList()){
            totalNumberOfImageEditUnits += trackResource.getSourceDuration().longValue() * trackResource.getRepeatCount().longValue();
        }
        totalRunningTime = totalNumberOfImageEditUnits/(compositionEditRate.getNumerator()/compositionEditRate.getDenominator());

        List<IMFEssenceDescriptorBaseType> imfEssenceDescriptorBaseTypeList = new ArrayList<>();
        Map<UUID, UUID> trackFileIdToEssenceDescriptorIdMap = new HashMap<>();
        for(AbstractApplicationComposition.ResourceIdTuple resourceIdTuple : getResourceIdTuples(virtualTracks)) {
            trackFileIdToEssenceDescriptorIdMap.put(resourceIdTuple.getTrackFileId(), resourceIdTuple.getSourceEncoding());
        }
        for(Map.Entry<UUID, List<Node>> entry: essenceDescriptorDomNodeMap.entrySet()) {
            if(trackFileIdToEssenceDescriptorIdMap.containsKey(entry.getKey())) {
                imfEssenceDescriptorBaseTypeList.add(new IMFEssenceDescriptorBaseType(UUIDHelper.fromUUID(trackFileIdToEssenceDescriptorIdMap.get(entry.getKey())), new ArrayList<>( entry.getValue())));
            } else {
                imfErrorLogger.addError(IMFErrorLogger.IMFErrors.ErrorCodes.IMF_CPL_ERROR,
                        IMFErrorLogger.IMFErrors.ErrorLevels.NON_FATAL,
                        String.format("Resource = %s is not referenced in the virtual track.", UUIDHelper.fromUUID(entry.getKey())));
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