acknowledgements for ansi/nist-itl 1-2011 - NIST Visual Image ...

ANSI/NIST-ITL 1-2011 - UPDATE 2013 DRAFT VERSION11.014: Codec / CDC should not be included in the record.• For container types that allow different codecs and codec format, and if thecontainer format does not specify the codec format, then Field 11.014:Codec / CDC should be included in the record.The information items for this field are described below.• The first information item, which is mandatory, is container code / CONC.It is taken from the container code column of Table 74 Audio VisualContainer Codes . A container code of Other (CONC=2) indicates thatthe container is given neither in Table 74 Audio Visual Container Codesnor in the external container list and must be specified. If CONC=2, theField 11.051: Comment / COM shall be used to describe the container. Seehttp://www.nist.gov/itl/iad/ig/ansi_standard.cfm for additionalcontainers. Such additional containers (not listed in Table 74 Audio VisualContainer Codes ) shall use the value CONC=1.• The second information item only appears if CONC = 1. It is the externalcontainer reference code / ECON and contains the 'reference code' fromthe table of containers available athttp://www.nist.gov/itl/iad/ig/ansi_standard.cfm.• The third information item (comments / COM) is an optional, unrestrictedtext string of up to 4000 characters in length. However, it is required ifCONC = 2. It can contain additional information about the container oradditional instructions for reconstruction of audio output from the storeddigital data. Container parameters shall be specified in this information itemwhen required for unambiguous decoding. This item should include adescription of any noise reduction processing or equalization that must beapplied to faithfully render the voice recording.8.11.14 Field 11.014: Codec / CDCThis is an optional field that gives information about the codec used to encode the voiceand audio data in the digital recording. It may only appear is Field 11.003: Audioobject descriptor code /AOD is set to 0, 1 or 2. (This field is not used if the voicerecording is stored on a physical media object as an analog signal.)Information in Field 11.013: Container / CONT overrides this Field if both arepresent.• If a container format in Field 11.013: Container / CONT specifies a codecwhich cannot be changed, then Field 11.014: Codec / CDC should not beincluded in the record.• For container types specified in Field 11.013: Container / CONT thatallow different codecs and codec formats then Field 11.014: Codec / CDCshould be included in the record.• Field 11.013: Container / CONT need not be present for RAW files, butCDC is mandatory if CONT is set to RAW.248