Adobe Premiere Pro CS6 - Manual (Page 121)

Support for growing files
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Support for growing files in Premiere Pro CS6
Growing files are those that grow in duration after they are ingested. Premiere Pro CS6 supports growing files for those needing that workflow.
Supported codecs for growing files include:
AVCI50/100
IMX30/40/50
RDD9-compliant XDCAM HD 50/35/25/18
QuickTime wrapped files in these formats are supported in Premiere Pro CS6 (6.0.2), and later
Support for growing files to automatically refresh, and how often they should refresh, is available in Media Preferences. The updated duration can
be viewed in the Source Monitor. See
Media Preferences for details.
Ingesting or capturing media for growing files can only take place if Premiere Pro can read the volume (Premiere Pro can read footage from a unc
path ("//somewhere/something"), but the drive must be mapped ("H:\somewhere\something"). The file can then be imported using the File > Import
command. You can then edit with these clips as you normally would any other clip.
Update to Premiere Pro CS6 (6.0.2) to get the full benefit of this feature.
See this blog post for more details about support for growing files in Premiere Pro CS6.
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