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uuid, umid generation, using filler in mxf http://www.freemxf.org/forum/viewtopic.php?f=3&t=123 |
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Author: | Tommy [ Wed Dec 05, 2007 4:22 pm ] |
Post subject: | uuid, umid generation, using filler in mxf |
Hi, I've got a couple questions regarding the use of id's in an mxf file. Are there any restrictions regarding the creation of UUID's or can they be just random unique numbers? (including the use of UUID's within UMID's) I understand how the references work with regard to UUID's, but am not clear whether UMID's need to match sometimes within an mxf file. UMID's are used in many places within an mxf file, including: in the header metadata - > in essence container data, linked package umid (p. 65 S377M) > in each package, a package umid (p. 66 377M) > in sourceclip subset, a SourcePackageId (p. 70, 72) Then, in each edit unit's package metadata, there is a UMID metadata field ( type = 0x83, SMPTE 331M p. 10) In our mxf file, we plan to have a material package and a file package in the header metadata, and then mpeg2 video along with audio and timecode in the essence containers. Can you please tell me where and how the UMID's need to match up, and where unique UMID's are required? Then 1 other question: we'd like to make our header metadata a fixed size, and we have either 0, 2, 4, or 8 channels of audio. Is it possible to use fill space in this way, ie, place filler everywhere necessary when we have less than 8 channels of audio to keep the header the same size? The documentation appears to indicate that this is ok to do. Thanks a lot, Tommy Schell |
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