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Author Topic: DCP-o-Matic: Problem creating 5.1 VF Leo Enticknap Film God Posts: 7474 From: Loma Linda, CA Registered: Jul 2000 posted 06-02-2016 12:59 PM                        Many thanks - downloaded and installed 2.8.7, and it's now 14% "encoding picture and sound" through the VF render after about an hour and a half. If it keeps going at the same rate, it should take 9-10 hours total and be done when I get back from work tonight. Will update then! I also emailed you the log from the effectively stalled 2.8.0 render.  |  IP: Logged Carsten Kurz Film God Posts: 4340 From: Cologne, NRW, Germany Registered: Aug 2009 posted 06-02-2016 02:42 PM                     That still sounds too slow for me. But let it go... - Carsten  |  IP: Logged Carl Hetherington Film Handler Posts: 93 From: York, North Yorkshire, England Registered: Jul 2012 posted 06-02-2016 03:10 PM                        It is rather slow, but at least now it doesn't get any slower as it goes on. The slow bits now, I believe, are the filters for the upmixer. I need to look at those.  |  IP: Logged Carsten Kurz Film God Posts: 4340 From: Cologne, NRW, Germany Registered: Aug 2009 posted 06-02-2016 03:44 PM                     Ah, yes the upmixer. Haven't used it on a full length feature yet. - Carsten  |  IP: Logged Leo Enticknap Film God Posts: 7474 From: Loma Linda, CA Registered: Jul 2000 posted 06-03-2016 10:29 AM                        Although the progress reporting is now a lot more informative, I'm afraid that the basic problem still exists. When I got home last night it was on 32%, and it's only on 33 now (seven hours later). Something is happening whereby the rate of audio processing decreases as it gets deeper into a longer DCP. I'm pretty convinced that the same thing is actually happening as when I tried doing this with 2.8.0: it completes the first 15-20% of the process relatively quickly, and then slows to a crawl.  |  IP: Logged Carl Hetherington Film Handler Posts: 93 From: York, North Yorkshire, England Registered: Jul 2012 posted 06-03-2016 10:46 AM                        Hmm. Could you re-send the log from this new run?  |  IP: Logged Carsten Kurz Film God Posts: 4340 From: Cologne, NRW, Germany Registered: Aug 2009 posted 06-03-2016 11:48 AM                     Maybe try without the up-mixer? Not that it really matters here - but what type of machine (CPU/Speed) is this? Could you check memory/swap usage during the conversion? Carl - would there be special log options to activate in order to facilitate analysis? - Carsten  |  IP: Logged Leo Enticknap Film God Posts: 7474 From: Loma Linda, CA Registered: Jul 2000 posted 06-03-2016 12:51 PM                        New log file emailed to Carl. I don't think it's a hardware issue, because I've just tried the same thing on another computer running the same operating system, and once again I'm at 14% after around an hour and a half. For the record, the computer I've been using so far is an Acer Aspire V laptop with a Core i5 processor, RAM upgraded to 8GB, with the hard drive nuked, UEFI disabled and Ubuntu 14.04 LTS (64-bit) installed. The keyboard and touch pad are so sh!tty that it's useless for any interactive work, so I use it almost exclusively for long copying jobs and DCP rendering. It's definitely an audio processing issue that occurs when: 1 - You're creating a VF that "refers to existing DCP" for the pix but not the sound. There is no problem doing this the other way round, because I've created countless scope VFs from flat OVs (e.g. hour long slide loops for walkins) without this slowing down issue. 2 - You're trying to modify the audio in some way, but I don't think it relates to the upmixer specifically and exclusively. While I was recreating the issue on my main PC, I also started another render going on the laptop, but changing audio settings only in the VF. This time I deselected the left channel altogether and moved right to center (to simulate the correction of a 2.0 mono file to a 1.0 on center channel mono DCP, something it would be very useful to be able to do). This was on a 22-minute file. This time it got to 45% (ish) pretty quickly, and then slowed right down again. So unless I'm missing something, the problem has to be something to do with the way it's creating new audio to sync to existing video.  |  IP: Logged Carsten Kurz Film God Posts: 4340 From: Cologne, NRW, Germany Registered: Aug 2009 posted 06-03-2016 02:59 PM                     I didn't suspect a hardware problem, but I wanted to get an idea about the general performance of your machine and wether the slowdown could be caused by a memory leak leading to excessive swapping. - Carsten  |  IP: Logged Leo Enticknap Film God Posts: 7474 From: Loma Linda, CA Registered: Jul 2000 posted 07-04-2016 12:33 PM                        Very happy to report that this bug is fixed in version 2.8.16 - it created the audio VF for the 87-minute feature in 13 minutes. Very many thanks for Carl for fixing this.  |  IP: Logged Buck Wilson Jedi Master Film Handler Posts: 894 From: St. Joseph MO, USA Registered: Sep 2010 posted 07-04-2016 05:22 PM                     That's fantastic. What great service. Carl, what drove you to create this great program? And why free? Bless you!  |  IP: Logged Carl Hetherington Film Handler Posts: 93 From: York, North Yorkshire, England Registered: Jul 2012 posted 07-04-2016 05:44 PM                        Hey Buck, Initially I made it because I was a projectionist and we were getting a lot of stuff on DVD/MP4/whatever that "just" needing running in the middle of a set of DCP trailers, or something. Work were never going to spring for CineAsset or whatever so I looked at OpenDCP and tried to make a one-click version of it. Initially the idea was to integrate DVD ripping so you could put your DVD in, click go and get a DCP out! The first versions were basically a set of command-line tools (opendcp and FFmpeg mainly) gaffer-taped together with a quite crappy front end. It started being useful at work so I released it, and it's amazing what a few emails from interested folks will do for one's motivation. I left my projectionist job when available hours started fading away (with full automation of digital shows and decreasing 35mm) but by then people were showing more interest in DCP-o-matic so I kept on with it. And here we are... It's a shame; the projectionist job is still my favourite DCP-o-matic is free because I think free-as-in-speech is the only sensible way to make and release software, so that's ideological I suppose. The fact that few have figured out a way to make a living out of it is an implementation detail Cheers, Carl  |  IP: Logged

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