[Bug 747403] New: Inconsistent and poor video capture frame rates on OS X and iOS

[GStreamer (GNOME Bugzilla)]

https://bugzilla.gnome.org/show_bug.cgi?id=747403

            Bug ID: 747403
           Summary: Inconsistent and poor video capture frame rates on OS
                    X and iOS
    Classification: Platform
           Product: GStreamer
           Version: git master
                OS: Mac OS
            Status: NEW
          Severity: normal
          Priority: Normal
         Component: gst-plugins-bad
          Assignee: gstreamer-bugs at lists.freedesktop.org
          Reporter: c at ijsf.nl
        QA Contact: gstreamer-bugs at lists.freedesktop.org
     GNOME version: ---

Created attachment 301007
  --> https://bugzilla.gnome.org/attachment.cgi?id=301007&action=edit
Fix for maximum capture rate

As copied from the OpenWebRTC issue tracker at
https://github.com/EricssonResearch/openwebrtc/issues/243

--

I have been testing the local video capturing in the iOS build of OpenWebRTC on
an iPad Mini Gen 1 (armv7) using demo.openwebrtc.io:38080 and noticed that the
frame rate of the local video frame is very inconsistent. At times it is
reasonably fast (15 to 30 Hz), but most of the time it is way too low (1 Hz).

The video capturing is handled by the sys/applemedia code in gst-plugins-bad.
I've been checking the code and I think that the activeVideoMaxFrameDuration is
not set properly: it is set to the maximum frame duration, while I believe it
should be set to the minimum frame duration as to "fix" the frame rate to the
highest possible value.

--

This minimal patch fixes the maximum frame rate to the minimum possible values,
as recommended by Apple for use with high performance video capture use cases,
at
https://developer.apple.com/library/ios/documentation/AVFoundation/Reference/AVCaptureDevice_Class/index.html

Patch has been tested and verified to be working (OpenWebRTC).

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