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Author Topic: Converting a Blu-ray (or DVD) to DCP Mike Blakesley Film God Posts: 12767 From: Forsyth, Montana Registered: Jun 99 posted 09-25-2013 11:57 AM                        To make matinees easier (since we often can't get DCPs of them) I'm experimenting with converting movies from Blu-Ray. First I tried doing "Apollo 13" from a DVD, and then "The Blues Brothers" from a Blu-Ray. (Figured if I'm going to experiment, might as well do it with movies I like.) I used "MakeMKV" to convert the video files, and then "DVD-o-Matic" to convert to DCP. The various channels come through fine and the picture looks great, but there is an issue with the sound. The center channel gets overdriven on very loud bits (like the launch scene in Apollo) to the point where the speaker makes a "crackling" distortion sound. I tried lowering the volume even to below "movie-watching" level and the sound is still there, so it seems like it's gotta be with the source material somehow. The problem is MUCH worse with Apollo 13....maybe because the source is a DVD(?) I did not notice this when playing the same movies directly from the discs...but, I don't think our system decodes the sound the same way when playing DVDs or Blu-Rays. (The player (Oppo) is connected with an HDMI cable and just a left/right patch cord for the audio.) What's strange is, this distortion sound only seems to come from the center...when there is big-time noise on the left/right or surrounds the problem isn't there. I also notice a kind of stridency in the sound (harshness) that's not there with a regular cinema DCP....could that be the ever-popular "home" mix coming through? I thought maybe there was a problem in our center speaker (QSC 3-way) but regular movies sound great and I don't notice any of these problems with them. I've pretty much left the defaults alone in everything during my conversion process, so is there something I ought to be changing to improve on this?  |  IP: Logged Carl Hetherington Film Handler Posts: 93 From: York, North Yorkshire, England Registered: Jul 2012 posted 09-25-2013 12:06 PM                        Hi Mike, Try dropping the audio gain in DVD-o-matic (audio tab) to something like -12dB. I'm not entirely sure why, but quite a lot of DVD/BR material ends up with very hot audio which clips somewhere inside DVD-o-matic. If you still have the DVD-o-matic "films" (projects) that you created those DCPs with, you should find that if you drop the audio gain and re-run "Make DCP" it will skip through quite quickly (just checking that the video is right, and re-creating the audio part). Best Carl  |  IP: Logged Mike Blakesley Film God Posts: 12767 From: Forsyth, Montana Registered: Jun 99 posted 09-30-2013 03:43 PM                        Thanks Carl, I'll give that a try. Sounds like a fix.  |  IP: Logged Matthew Philp Film Handler Posts: 20 From: Newquay, Cornwall, England Registered: Aug 2012 posted 10-02-2013 12:08 PM                     Hi Mike, Did this work for you? I'm in the process of converting a few shorts (113) for our regional film festival and have noticed the same problem on a few of the files I have converted. Thanks Matthew  |  IP: Logged Mike Blakesley Film God Posts: 12767 From: Forsyth, Montana Registered: Jun 99 posted 10-02-2013 12:21 PM                        I had deleted all the files of the movie I was working on to save disk space so I need to start from scratch on it, and I've had to be out of town a few days lately so time hasn't permitted. It's on my to-do list for this week though. I'll let you know how it comes out.  |  IP: Logged Alan Gouger Jedi Master Film Handler Posts: 501 From: Bradenton, FL, USA Registered: Jul 2000 posted 10-02-2013 12:42 PM                        If re-encoding Blu-Ray to a DCP does DVD-o-Matic convert color space and bit depth. Thank you.  |  IP: Logged Carl Hetherington Film Handler Posts: 93 From: York, North Yorkshire, England Registered: Jul 2012 posted 10-02-2013 03:42 PM                        quote: Alan Gouger If re-encoding Blu-Ray to a DCP does DVD-o-Matic convert color space and bit depth. Yes, it attempts to give a reasonably "straight" encoding (converting to the XYZ colour-space in 12-bit). Carl  |  IP: Logged Mark Strube Master Film Handler Posts: 322 From: Milwaukee, WI, United States Registered: Feb 2007 posted 10-17-2013 09:47 PM                        I've considered doing this to make our classic midnight showings easier. Does DVD-o-Matic retain 5.1 sound from an MKV with a Dolby Digital or DTS track? If so, is there anything special you're doing to achieve that? Also I'm curious, what's your JPEG2000 bitrate of choice?  |  IP: Logged Carsten Kurz Film God Posts: 4340 From: Cologne, NRW, Germany Registered: Aug 2009 posted 10-18-2013 03:02 AM                     Yes, DVD-o-matic will transfer AC-3 or DTS encoded multichannel audio to discrete PCM channels. The compression ratio does not influence encoding speed. So if there is enough space on the disc or server, just use higher datarates, that is, 150-200 MBit/s. 'grainy' old style footage may need a higher rate than animation style footage, and flat would need a higher rate than scope. I usually just leave it at 200 for BluRay conversions. Recompression is always 'bad', so, use higher rates as much as possible. - Carsten  |  IP: Logged Mark Strube Master Film Handler Posts: 322 From: Milwaukee, WI, United States Registered: Feb 2007 posted 10-26-2013 10:17 PM                        Thank you! I used DVD-o-Matic to transcode our midnight screening of Friday the 13th... worked like a charm and even retained the 5.1 audio. Is there currently any support for Dolby TrueHD and/or DTS-MA? When I ripped the Blu-ray I only extracted the "core" audio so as to not cause issues.  |  IP: Logged Carsten Kurz Film God Posts: 4340 From: Cologne, NRW, Germany Registered: Aug 2009 posted 10-27-2013 09:53 AM                     No problem to my knowledge. These things are handled internally by FFMPEG, which is able to deal with TrueHD and DTS HD-MA. I regularly extract DTS-HD MA for DCP conversions. - Carsten  |  IP: Logged Alan Gouger Jedi Master Film Handler Posts: 501 From: Bradenton, FL, USA Registered: Jul 2000 posted 10-29-2013 11:15 PM                        Just finished my first movie using DVD-O-Matic. When ingesting to the Sony 515 it does not show up. Does the drive have to be formatted to EXT2 or EXT3? Thank you.  |  IP: Logged Chris Slycord Film God Posts: 2986 From: 퍼항시, 경상푹도, South Korea Registered: Mar 2007 posted 10-29-2013 11:39 PM                     Don't the DCI specs say that the distribution format for the hard disk be either EXT2 or EXT3? I believe support for others, such as NTFS were hit or miss. Though if you are using a disk that you've successfully used before, I'd think it's not due to the file system.  |  IP: Logged Michael Kurtzke Film Handler Posts: 45 From: Ashburn, VA, USA Registered: Feb 2013 posted 10-29-2013 11:50 PM                     quote: Alan Gouger Just finished my first movie using DVD-O-Matic. When ingesting to the Sony 515 it does not show up. Does the drive have to be formatted to EXT2 or EXT3? Thank you. Alan, with our 515's we just use a Western Digital My Passport portable hard drive using the NTFS Format.  |  IP: Logged Carsten Kurz Film God Posts: 4340 From: Cologne, NRW, Germany Registered: Aug 2009 posted 10-30-2013 06:39 AM                     The Sony supports NTFS. Alan, try to copy e.g. a DCP trailer etc. on that same drive and see wether it is visible for ingest. If it is, simply create a short DCP with DVD-o-matic, any video file from the internet. Copy the whole folder of files to the drive. Try of that works. Then go ahead with a full BluRay conversion. - Carsten  |  IP: Logged

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