[FFmpeg-trac] #9505(undetermined:open): Unsupported frame rate with capture device after updating to MacOS Monterey

FFmpeg trac at avcodec.org
Fri Nov 12 15:20:33 EET 2021

#9505: Unsupported frame rate with capture device after updating to MacOS Monterey
             Reporter:  ewu100       |                    Owner:  Thilo
                                     |  Borgmann
                 Type:  defect       |                   Status:  open
             Priority:  critical     |                Component:
                                     |  undetermined
              Version:  unspecified  |               Resolution:
             Keywords:               |               Blocked By:
             Blocking:               |  Reproduced by developer:  0
Analyzed by developer:  0            |
Comment (by Thilo Borgmann):

 Replying to [comment:3 ewu100]:
 > Replying to [comment:1 Thilo Borgmann]:
 > > If there is no 30 fps mode listed under supported modes, there's
 nothing we can do about that - the OS has changed its mind of what to
 support (or the drivers, is there something involved from magewell?).
 > > Testing the modes is not without a chance some modes just declare 60
 fps but gives you 30 in the end.
 > Hi Thilo,
 > I appreciate your response to my ticket. To provide some additional
 information, I ended up writing a command line app in Swift to achieve
 what I'm trying to do (simply record a video from an external capture
 device via the command line) and found that using Apple's AVFoundation
 framework, I can record videos from the magewell capture device at 30fps.
 > Given this new information, would that still point to a problem with the
 drivers and/or the OS? Not at all trying to challenge what you're saying,
 just want to provide some more context in case it indicates anything.

 If you are able to do that, you can see where the difference between your
 cmd line tool and FFmpeg is in acquiring the device.
Ticket URL: <https://trac.ffmpeg.org/ticket/9505#comment:4>
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