• Adobe After Effects

  Video monitor & After Effects (BM Decklink)

  Posted by Thomas Duquet on August 29, 2018 at 7:03 am

  Hey everyone

  First time posting here after reading a lot.
  I’ve asked this on other forums (blackmagic and Adobe) but can’t seem to have any response yet.

  I am trying to have a good monitoring of my work in After Effects (AE) using a Decklink monitor on mac (hackintosh, pci e).
  There is a lot of things that I don’t understand so sorry for the noob questions, but I can’t find any information about that :

  – Mercury Transmit activated on AE with Decklink monitor
  – My config is a DELL U2412M > HDMI > Decklink monitor 4K, for now
  – My composition is 25 fps : Error message, monitor don’t support this (monitor is running native at 1920×1200 60Hz). Does it means that the Decklink is sending 25 Hz to the monitor and it doesn’t support it ? Would a “real” video monitor support it ?
  – On Resolve, on a 25 fps timeline, it works fine. Why ? Is it Resolve who convert 25 to 60 ? Do I see 25 or 60 Hz ?
  – On AE : 50 or 60 fps composition, it display an image. BUT : the playback on the monitor is not sync with AE. On the monitor, it is slower, and it stops seconds after I press “stop” (space bar) and the composition has stop playing.
  – On AE : my monitor is 1920×1200, my comp is 1920×1080, but the decklink display it vertically stretched on the external monitor, so it takes all the display area. Can’t seems to find how to correct it.

  It seems like I am doing everything wrong. I really need help from more experienced people.

  – Can I, with a decklink monitor, and a pc monitor, have a real 25/30/50/60 fps monitoring on AE ?
  – What hardware do I need to see real progressive AND interlaced output ?
  – I do motion design, now for the television, and I need to see my animation @25 fps 1080i in order to see if the animation is displaying fine.

  I would really appreciate your help !

  Thomas Duquet replied 8 years ago 2 Members · 2 Replies
• 2 Replies

• 

  Tero Ahlfors

  August 29, 2018 at 9:04 am

  I/O devices only output to standard resolutions and frame rates supported by the device. I think there was an option in the playback settings to up or downscale the signal if the display resolution doesn’t match. If you need to monitor in 50/60fps you’ll need to check that your I/O device supports that frame rate in the resolution you’re working in. So if you want to monitor 1920×1080 at 50fps but the device only supports 1280×720 at 50fps there will be no output.

  I also doubt that your monitor can show interlaced footage correctly. I’d suggest getting a proper reference monitor. Like the Flanders Scientific AM-210.
• 

  Thomas Duquet

  August 29, 2018 at 9:52 am

  Thanks for your help,

  [Tero Ahlfors] “So if you want to monitor 1920×1080 at 50fps but the device only supports 1280×720 at 50fps there will be no output.”

  Well Blackmagic Monitor 4K support a lot of frame rate :
  
HD Video Standards

  720p50, 720p59.94, 720p60
1080p23.98, 1080p24, 1080p25, 1080p29.97, 1080p30, 1080p50, 1080p59.94, 1080p60
1080PsF23.98, 1080PsF24, 1080PsF25, 1080PsF29.97, 1080PsF30
1080i50, 1080i59.94, 1080i60


  So I don’t understand why my monitor does not support the output at 1080p25.
  Is it my monitor who does not support 25Hz ? I don’t have enough knowledge about that.
  And why on the same monitor, the BM card plays from resolve a timeline at 1080p25.

  [Tero Ahlfors] “I also doubt that your monitor can show interlaced footage correctly. I’d suggest getting a proper reference monitor. Like the Flanders Scientific AM-210.”

  Thanks about that I don’t know a lot of reference monitor yet.
  A shame there is no “cheap” way to display interlaced footage.

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