 |
 |
Jerry and other AV folks: I asked Dave Ackerman, our audio engineer, about the use of TCF for time codes (since he was the one who originally asked for it), and he had a couple of comments on this discussion. First, he says that all of the listed SMPTE values are all fully described by TCF, and with "sample accuracy", thus simplifying Jerry's list down to BYTE - A byte offset into a content file IDREF- An XML ID attribute value located within the content file SMIL - a valid SMIL time value (e.g., 3.5s for 3.5 seconds) MIDI - a MIDI time code; basically an extension of SMPTE TIME - In essence, a SMPTE without a frame value, for those who don't want to get into that level of precision. It must follow the format of HH:MM:SS. TCF - pithy definition to be supplied He also says that TCF is fully described in AES-31-3 available from AES Standards (that's the international Audio Engineering Society). And he still believes that we need it because it's the only timecode format that can be equally applied to digital and analog sources that conveys sample accurate timing. He says it also contains information important to the video post community. So there you have the rationale, and I'm sure he'd be happy to provide more detail, maybe even a nice one-line definition of the TCF standard, on request. Thanks, _____________________________________________________________________________ MacKenzie Smith [log in to unmask] Digital Library Program Manager phone: (617)495-3724 Office for Information Systems fax: (617)495-0491 Harvard University Library %\%\%\%\%\%\%\%\%\%\%\%\%\% -----------------------------------------------------------------------------