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IDProjectCategoryView StatusLast Update
0001859DCP-o-maticBugspublic2021-02-27 21:09
Reporteroverlookmotel Assigned Tocarl  
PriorityimmediateSeverityminorReproducibilityhave not tried
Status feedbackResolutionopen 
PlatformMacOSOS XOS Version10.14
Product Version2.14.37 
Summary0001859: Export ProRes from DCP with start trim still decodes whole film
Description

If I want to export just the last minute of a feature-length DCP to ProRes, I set "Trim from start" to 1 minute before then end of the DCP, before using Job -> Export.

When making a DCP from a DCP source, DCP-o-matic knows to skip decoding of frames which won't be used in the output. But when using Job -> Export, it appears that DCP-o-matic does efficiently seek to the start position before starting decoding.

At least, that's my guess as to what's happening. Observed behaviour is that "Transcoding" sits on "Encoding 0%, 0/1500 frames" for a very long time. CPU usage is very low during this time, so maybe it's not actually decoding the frames - but it's doing something for a long time before it gets to the actually producing any output.

I can't confirm if it ever gets to point of producing output, as I gave up waiting. But if you set trim in point to 10 minutes, and duration to 1 minute, it sits apparently idle for about 5 minutes with "Encoding 0%" before it starts producing output and then advances quickly up to 100%.

If it's relevant, in this case the source DCP is 4K, and I'm exporting as 2K ProRes.

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carl

2020-11-21 22:46

administrator   ~0004014

If you get some time to test, it would be interesting to see if this still happens on current 2.15.x - it looks like it might be fixed, to me.

Bug History

Date Modified Username Field Change
2020-10-17 13:04 overlookmotel New Bug
2020-10-18 00:25 carl Priority normal => immediate
2020-10-18 00:25 carl Status new => acknowledged
2020-10-18 00:25 carl Target Version => 2.16.0
2020-10-18 00:25 carl Estimated work required => Undecided
2020-11-21 22:46 carl Assigned To => carl
2020-11-21 22:46 carl Status acknowledged => feedback
2020-11-21 22:46 carl Note Added: 0004014
2020-12-01 12:31 carl Estimated work required Undecided => Unknown
2021-02-27 21:09 carl Target Version 2.16.0 =>