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Avid Media Composer - Mac
Forum for advanced Media Composer Mac users.
  • Can My Machine Handle Another Update?


    My machine is an iMac 27" late 2013, 3.5 GHz, Intel Core i7, 32 GB RAM, running OS Mojave.

    My current AVID MC is 2020.12 version.

    I wonder if my machine could handle well an AVID MC 2021.9 version, if I update to it.




  • Media Composer 2021.9 crash on reloading LEPCore.acf


    here's a strange behaviour: I usually have my macbook pro 15 (2016) hooked to a CalDigit Thunderbolt Station 3 Plus to connect two external 4k LG monitor and all other peripherals with one cable.

    Everything works fine, MC 2021.9 too.

    Yesterday I needed to use my macbook pro alone (not connected to the interface), but MC crashes on start at the moment it is RELOADING PLUGIN: LEPCORE.ACF. No way to make it work: I tried uninstalling-rebooting-reinstalling a few times but nothing. If I reconnect the CalDigit it starts working again.

    The only solution I found is to reinstall 2021.5, which is bad because I really like 2021.9 and wanted to use it.

    Any Ideas?

    Thank you,


  • Show Markers in Timeline Fast Menu not working

    In the Timeline Fast Menu I select Show Markers > None, then Show Markers > Blue, for example, but no markers are visible on the timeline.


    Is anyone else having this issue? Or has it been reported previously?


    Furthermore, when using the Go To Next Marker and Go To Previous Marker, despite the fact that none are visible, it cycles through all of them, regardless of colour. Surely it would make sense for only the (supposedly) visible colours to be navigated to using these commands or, at the very least, have an option to navigate to visible markers only.

  • Media Composer 2021 full screen playback freezes system


    Since I upgraded to MC 2021, whenever I cmd+tab (or click in another application), say I want to check an email or glance at a PDF, when I cmd+tab back to MC the entire system halts for a while. It can last for seconds, minutes or indefinitely (need to power down the laptop to restart).

    After tinkering with settings, changing cables, checking system stats, etc., I found out the culprit was the “Full Screen Playback” that I let on one of the monitors. If I disable it via cmd+shift+F BEFORE cmd+tab to another application, there’s no freeze at all when I cmd+tab/click back to MC.

    Besides this issue, MC 2021.9 is behaving perfectly fine in my MacBook Pro 2017 (Catalina 10.15.7). Using the laptop + one 1080p monitor (HDMI via dongle) + one 1440p monitor (DisplayPort via dongle).

    I’ve tried:

    - Removing one or both extra monitors

    - Removing apps from the taskbar (i.e. Dropbox, Creative Cloud, etc.)

    - Close all apps (but even cmd+tab to Finder will cause the issue)

    - Creating new Avid user

    - Tinker with settings, displays, etc.

    None helped: if Full Screen Playback is active in ANY monitor, when I go back to MC the system freeze happens. The more time I take outside MC, the longer the freeze will last, it seems.

    I know I can just train my brain to hit cmd+shift+F any time I want to click outside MC, but that’s just ignore the problem, not solving it. Any help is appreciated :D


    @font-face {font-family:"Cambria Math"; panose-1:2 4 5 3 5 4 6 3 2 4; mso-font-charset:0; mso-generic-font-family:roman; mso-font-pitch:variable; mso-font-signature:3 0 0 0 1 0;}@font-face {font-family:Calibri; panose-1:2 15 5 2 2 2 4 3 2 4; mso-font-charset:0; mso-generic-font-family:swiss; mso-font-pitch:variable; mso-font-signature:-536859905 -1073732485 9 0 511 0;}p.MsoNormal, li.MsoNormal, div.MsoNormal {mso-style-unhide:no; mso-style-qformat:yes; mso-style-parent:""; margin:0cm; margin-bottom:.0001pt; mso-pagination:widow-orphan; font-size:12.0pt; font-family:"Calibri",sans-serif; mso-ascii-font-family:Calibri; mso-ascii-theme-font:minor-latin; mso-fareast-font-family:Calibri; mso-fareast-theme-font:minor-latin; mso-hansi-font-family:Calibri; mso-hansi-theme-font:minor-latin; mso-bidi-font-family:"Times New Roman"; mso-bidi-theme-font:minor-bidi;}p {mso-style-noshow:yes; mso-style-priority:99; mso-margin-top-alt:auto; margin-right:0cm; mso-margin-bottom-alt:auto; margin-left:0cm; mso-pagination:widow-orphan; font-size:12.0pt; font-family:"Times New Roman",serif; mso-fareast-font-family:"Times New Roman";}.MsoChpDefault {mso-style-type:export-only; mso-default-props:yes; font-family:"Calibri",sans-serif; mso-ascii-font-family:Calibri; mso-ascii-theme-font:minor-latin; mso-fareast-font-family:Calibri; mso-fareast-theme-font:minor-latin; mso-hansi-font-family:Calibri; mso-hansi-theme-font:minor-latin; mso-bidi-font-family:"Times New Roman"; mso-bidi-theme-font:minor-bidi;}div.WordSection1 {page:WordSection1;}

  • Playing or transcoding AVCHD files crashes Avid 2021.5.0


    I'm having persistent issues with AVCHD (H.264, C100 footage) files in MC 2021.5.0

    • Attempting to load the linked clips into source monitor instantlly CRASHES AVID
    • Attempting to transcode the linked clips to any resolution instantly CRASHES AVID
    • Attempting to import the AVCHD file(s) instantly CRASHES AVID
    • Attempting a workaround suggested in the forums of unlinking, deselcted audio tracks and relinking CRASHES AVID
    This is happening on a number of machines in a higher education intitution. All of the machines are i7 8-Core Intel iMacs running MacOS 11.6.1 (Big Sur). There seems to be no ryhme or reason to which machines have the issue with AVCD files and which don't. It also makes no difference if you're linking to footage on a external HD or the Mac HD.

    Avid is linking to the footage using the AVCHD MSP plugin.  Tests were done on all of the machines a few months ago when MC and machines were given a clean install, with no issues. Any ideas, or input from Avid types greatly appreciated. The issue is becoming a real pain.

  • Markers Window - "Display frames for easy visual reference" not working on V2

    In the summer I jumped from MC v2018.12.* to v2021, currently on v2021.9.   I'm noticing that the Markers Window feature "Display frames for easy visual reference" (as described in the Editing Guide) isn't working for markers on track V2.  I made a screen recording to to illustrate:




    Do I have to go all the way back to v2018.12.* to get Markers Window frames working again on V2 or is there a 2019, 2020 or 2021 version where this worked?


  • Changing multiple groupclips in a timeline


    I have a large timeline full of groupclips and I wanted to see if there is any method to change entire tracks to a MultiCam number for exporting.  For example, all of V1 track I want to change the groupclips to M1 and V2 to M2, etc.   Currently I can only change one clip at a time and it's very time consuming.   If aynone knows of a method to speed this process up it would be much apprecieated.


    Thanks in advance!


    MC 2021.6.0


  • Assertion failed

    Hi all,

    I just recently had a new Mac installed (Rack 2019), currently running on OS 10.15.7. I've installed 2020.12.3 and everytime I try to open Avid I get this message;

    "Assertion failed: m_Context
    File: /Users/releng/Builds/workspace/MC/MCRelease_2020.12_LTM/
    Mac_Build/cores2/core/src/viewer/OGL/OGLContextMac.mm,Line: 319" 

    Pressing "Continue" or "Exit Application" causes it to close, but if I click "Debugger" twice it then goes into the Project Selection window. When I then select a project, I get a similar message;

    "Assertion failed: OGL Inspector::Initialized()
    File: /Users/releng/Builds/workspace/MC/MCRelease_2020.12_LTM/
    Line: 36" 

    I can continue to press "Continue" from here get go into the project but anytime I click something the same error will crop up.

    I've seen suggestions to delete the pmr and mbd files but that doesn't do anything. I also have no clue as to where "releng" is in the finder.

    I am using EditShare if that helps. AvidStyle and AvidAFP are enabled.

    Any suggestions? 


  • bug loading source markers

    This has been around for a bit and still happens for me in 2021.9. If I am working in the timeline and have the markers window open and I load a clip in the source window that has markers, the markers window doesn't switch to the source markers. For the past year or so (at least) I have to click on the record window then back to the source window for them to load. I'm pretty sure it didn't do this in the past.

  • Avid MC import and consolidate/transcode

    The slighlty older editors lets users use the import faeture for most clips. The newer one makes then transcode. Is there any way to make them import.

    Personally I think they should merge the commands in the next MC version. 

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