Latest post Wed, Feb 27 2019 9:52 AM by Zdenek Klusacek. 7 replies.
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  • Fri, Feb 5 2016 10:20 PM

    • Robert B
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    Media Composer 8.5 Cache and Video Memory Suggestions

    I was wondering if more light could be shed on the new media cache options in 8.5. I'm assuming that when we allocate more "Video Memory" we are using our system RAM vs our graphics card VRAM. My system has 32GB RAM and the "High" setting is suggesting 22GB of it is used. What kinds of actions are enhanced in Media Composer with this Video Memory RAM cache?

    For the disk cache folder, is it better to use my internal Apple flash system drive or should I stick the cache folder on my thunderbolt edit raid?

    Just wondering what's going on "under the hood" with these new options. 

    -Robert

     

     

    OFFICE: 3.5 GHz Core i7 Late 2013 Imac running OSX 10.11 with 32GB RAM. NVIDIA GTX 780M 4096 MB. Avid Media Composer 8.5/ Pro Tools 12.4 MOBILE: 17"... [view my complete system specs]
  • Sat, Feb 13 2016 12:15 AM In reply to

    • Marty
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    Re: Media Composer 8.5 Cache and Video Memory Suggestions

    I'm also curious. 

    all different setups in various editing suites. my own: MC 2018.2, OSX 10.12.6, iMac (Retina 5K, 27-inch, 2017), 4,2 GHz Intel Core i7, 40GB RAM, Radeon... [view my complete system specs]

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  • Tue, Feb 16 2016 11:30 PM In reply to

    • Mike
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    Re: Media Composer 8.5 Cache and Video Memory Suggestions

    me too

    *0SX 10.14.3 *MC Ultimate 2018.12.3 *iMacPro (2017) 2.3 GHz Intel Xeon W-18cor*128 GB 2666 MHz DDR4*Radeon Pro Vega 64X 16 GB *AJA IO4KPlus *AVID ISIS... [view my complete system specs]
  • Wed, Feb 17 2016 6:28 PM In reply to

    • Mike
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    Re: Media Composer 8.5 Cache and Video Memory Suggestions

    BUMP

    *0SX 10.14.3 *MC Ultimate 2018.12.3 *iMacPro (2017) 2.3 GHz Intel Xeon W-18cor*128 GB 2666 MHz DDR4*Radeon Pro Vega 64X 16 GB *AJA IO4KPlus *AVID ISIS... [view my complete system specs]
  • Wed, Feb 17 2016 6:50 PM In reply to

    Re: Media Composer 8.5 Cache and Video Memory Suggestions

    The video Cache RAM is used to hold previously generated frames that may have taken longer than realtime to create.

    So normally if you play a demanding piece of playback you will get stutter and non relatime playback. Stop and play again and you see the same.

    The new cache holds as many frames as that amount of allocated RAM will support at the resolution you are using. The bigger the RAM cache the more frames that are held.

    Frames are pushed out as new frames are played so its like a sliding window of cached playback.

    Logic woul suggest making it as big as you can afford but duriing testing it appeared that there is a sweet spot that works best. So I'd experiment with it.

    Video Memory Allocation and Interactive Video Frame Cache on/off are independent.
    Video Memory Allocation is new and will get executed whether Interactive Video Frame Cache is enabled or not.

    Mac systems seem to work better with a lower value (around 2G or less)

    On a 32GB system with sequences less than 5 minutes long. Keeping the Memory cache to about 15GB should be more than enough.

    ACI Moderator. I'm not employed by Avid or work for them. I just do this in my spare time. Normally using the current Media Composer version on My... [view my complete system specs]

     

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  • Wed, Feb 17 2016 7:13 PM In reply to

    • Robert B
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    Re: Media Composer 8.5 Cache and Video Memory Suggestions

    Thank you Pat. 

    Your post was very helpful. I've noticed big gains in 8.5 when it comes to trimming responsiveness and playback stability. Playback would always stop or stutter during a cut even with all non-realtime effects rendered, this seems to be resolved. I guess I will try lowering the RAM allocation to 15GB (from 22GB) and see if freeing up more RAM for the system will be a better sweet spot. I know in After Effects it can significantly degrade performance if you give the program too much RAM and starve the system of resources. 

     

    -Robert

     

    OFFICE: 3.5 GHz Core i7 Late 2013 Imac running OSX 10.11 with 32GB RAM. NVIDIA GTX 780M 4096 MB. Avid Media Composer 8.5/ Pro Tools 12.4 MOBILE: 17"... [view my complete system specs]
  • Wed, Feb 17 2016 7:30 PM In reply to

    • Mike
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    Re: Media Composer 8.5 Cache and Video Memory Suggestions

    The test i've done on my mac system seem to be in accord with what youre saying. Although i have 64gb of ram, MC is not running as well as if i set it to 2GB

    *0SX 10.14.3 *MC Ultimate 2018.12.3 *iMacPro (2017) 2.3 GHz Intel Xeon W-18cor*128 GB 2666 MHz DDR4*Radeon Pro Vega 64X 16 GB *AJA IO4KPlus *AVID ISIS... [view my complete system specs]
  • Wed, Feb 27 2019 9:52 AM In reply to

    Re: Media Composer 8.5 Cache and Video Memory Suggestions

    I am sorry, but as usual with Avid this makes no sense at all.

     

    What could be the reason that Avid runs better with lowering this setting while it still has enough RAM?

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