-> just some of my thoughts on a trend that people use Avid video mixdown's in an online workflow keeping in mind future-proof conforms.
Most people make more then one version of an Avid video mixdown masterclip. Each version of an Avid video mixdown masterclip generated, appears in the Avid Bin with the same timecode of the Avid sequence source that was used to generate this video mixdown masterclip. Each version of the video mixdown masterclip made, has the exact same duration. By default, "Signature Source Mob" is the populated metadata in the "Tape" column of every Avid generated video mixdown .mxf source file.
The Avid can pull the wrong video mixdown .mxf source file instead of giving you a "Media Offline" if the original video mixdown .mxf source file is not available during the creation of the Avid media databases and a different Avid video mixdown .mxf source file with the same qualifying linking metadata is found in an active Avid MediaFiles folder structure.
The "Source File" column of an Avid video mixdown masterclip is not embedded metadata in the actual video mixdown .mxf source file, by default. What appears in an Avid Bin, in the "Source File" column of an Avid video mixdown masterclip is just the name of the actual video mixdown .mxf media source file that lives in an Avid activated MediaFiles folder structure, by default. You can look and see in the Avid Bin, that the video mixdown masterclip textual information, under the "Source File" column is the actual Avid video mixdown .mxf source file listed, it even has the .mxf suffix.
In an Avid Bin, this.mxf file name can be updated in the "Source File" column of an Avid video mixdown masterclip. If the Avid, when creating the media databases, a .mxf source file is found that fits the qualifying linking metadata requirements to thus be pulled if the original video mixdown .mxf source file is not available.
To prove it, open up a Bin, and you can just note the .mxf source file listed in the "Source File" column of the video mixdown masterclip and see that the "Source File" column name updates under this recreation of media databases circumstance with a missing source video mixdown .mxf file but having another version of the video mixdown .mxf source file that has the qualifying metadata to establish a link. The Avid creates new media databases, The .mxf file source name in the "Source File" column of an Avid masterclip does update in the Avid Bin and the Avid instead of displaying "Media Offline" now plays the wrong video mixdown .mxf source file.
For an Avid generated video mixdown masterclip, the tape - icon - (Looks like a piece of paper with the upper right corner of the paper folded down. There is a circle in the forground and a rectangle in the background on this "source" icon) using the Bin menu "Under Set Bin Display...> Sources".
The name of the source icon is "Signature Source Mob" and in the "Tracks" column this "Signature Source Mob" source icon does not have a TC1.
an example naming convention the Avid uses for Video Mixdowns master clips:
12345678910121416182022242628303234363840,Video Mixdown,1
the Avid appended: ",Video Mixdown, 1" and then would append ",Video Mixdown, 2" for the next video mixdown version created. The video mixdown masterclip name derived from the sequence that was used as the source to generate the video mixdown.
the name of the actual .mxf file: 1234567891012141618519B2E06.mxf - a 27 character name, plus the Avid appends the .mxf suffix.
The start timecode of the video mixdown masterclip appears generated from the sequence, yet there is not a timecode track "TC1" in the "Tracks" Column" associated with the Avid video mixdown masterclip "source" icon (the Avid Source icon revealed by using the Bin Menu "Set Bin Display...>Sources").
The actual Avid generated .mxf source file does not have timecode embedded in it. The video mixdown .mxf source file does have a duration.
"Signature Source Mob" is the metadata that is populated in the actual "Tape" column that is embedded in the Avid generated video mixdown .mxf source file. Thus, a situation where if you have multiple versions of Avid generated video mixdown files in an Avid Activated MediaFiles Folder Structure, those .mxf source files with the same embedded "Tape" Name "Signature Source Mob", the same masterclip duration, and the same timecode can respond with this type of linking activity. The actual start timecode embedded in the metadata of the .mxf file video mixdown source file appears as 00:00:00:00 as read this way by the Avid do to the fact if there is not embedded timecode metadata in the .mxf source file, the Avid will display the default 00:00:00:00.
Now by default, when an Avid video mixdown is generated, what appears in the Avid Bin under the "Start" column is the timecode extracted from the actual sequence that was the source to generate the Avid Video Mixdown masterclip.
- scott freeman
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