Video Playback Laggy

Anything and everything to do with DCP-o-matic.
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jakesinn
Posts: 24
Joined: Mon Sep 02, 2019 2:16 pm
Location: United States

Video Playback Laggy

Post by jakesinn »

Hi all,

I've created a DCP for a feature. I will attach the metadata and coversheet.

When I played back the DCP in DOM Player, most of it was fine - it was really only the end part that was playing back laggy. Will it play like this when ingested?

Cheers
Attachments
metadata copy.xml
Metadata
(4.61 KiB) Downloaded 33 times
COVER_SHEET copy.txt
Cover Sheet
(185 Bytes) Downloaded 32 times
- Jake S.

Carsten
Posts: 1581
Joined: Tue Apr 15, 2014 9:11 pm
Location: Germany

Re: Video Playback Laggy

Post by Carsten »

I don't think so. That DCP is pretty small for it's run time. Did you use the default data rate of 100MBit/s.? Check the playback resolution in player, and set it to quarter resolution. Are you doing this on a Mac?


- Carsten

jakesinn
Posts: 24
Joined: Mon Sep 02, 2019 2:16 pm
Location: United States

Re: Video Playback Laggy

Post by jakesinn »

Yes, I used the default data rate. Is that wrong? I don’t really know what that does to be honest.

I did set it to quarter resolution, and it still played back like that.

Yes, I am on Mac.
- Jake S.

Carsten
Posts: 1581
Joined: Tue Apr 15, 2014 9:11 pm
Location: Germany

Re: Video Playback Laggy

Post by Carsten »

The Mac has some special issues with playback currently.

For a long time, DCP-o-matic used a very conservative default data rate setting of 100MBit/s. Probably because initially, DCP-o-matic was DVD-o-matic and targeted DVD conversions, where 100MBit/s was more than enough. Recently, the default data rate for new installations has been changed to 150MBIt/s, but, existing installations still use the initial setting, even after updates. That's not a big thing, you will have a hard time noticing differences between 100 and 150MBit/s. And it has nothing to do with the playback performance issues. Set it to 150MBit/s and forget about it.

I am sure your DCP is okay. You can play with the window size in the player to see wether playback performance improves. Some settings give a better performance. On most current high-res Macs, full screen is impossible. To make sure everything is okay, you may stop somewhere around the end of your piece and give DCP-o-matic a few seconds to build a playback buffer - if you start playback then, the first seconds will play smoothly.

- Carsten

jakesinn
Posts: 24
Joined: Mon Sep 02, 2019 2:16 pm
Location: United States

Re: Video Playback Laggy

Post by jakesinn »

Thanks.

I'm going to re-make the DCP. I think it was actually a problem with the original MP4 file.

One thing I was wondering is also about the audio. I want it to play in 5.1. I'll attach the audio map. I don't think it's going to be 5.1 though.
Attachments
Screen Shot 2020-03-15 at 11.57.52 AM.png
Screen Shot 2020-03-15 at 11.57.52 AM.png (18.75 KiB) Viewed 933 times
- Jake S.

Carsten
Posts: 1581
Joined: Tue Apr 15, 2014 9:11 pm
Location: Germany

Re: Video Playback Laggy

Post by Carsten »

Is your source is stereo, how should the DCP become 5.1?
You may play a bit with the Upmixers under DCP->Audio, though. As far as I remember, you have an actual cinema to test the results? Because sometimes, these experimental Upmixers create strange results. If you use a recent DCP-o-matic version, you may need to enable the Upmixers first in advanced prefs before they show up.

- Carsten

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