Hi all,
recently i upgraded to Mac OS X 10.10 and ran into problems with the QTKit video capture in our application.
If i tried to open a capture device with pjmedia_vid_port_create i got this assertion:
Assertion failed: (di.fmt_cnt != 0), function pjmedia_vid_port_create, file ../src/pjmedia/vid_port.c, line 246.
Indeed the Facetime camera had no format info. I tracked down the problem and found that Mac Os returns the I420 format under certain circumstances.
A simple fix is to add I420 to the list of formats in qt_dev.m:
static qt_fmt_info qt_fmts[] =
{
{PJMEDIA_FORMAT_YUY2, kCVPixelFormatType_422YpCbCr8_yuvs},
{PJMEDIA_FORMAT_UYVY, kCVPixelFormatType_422YpCbCr8},
{PJMEDIA_FORMAT_I420, kCVPixelFormatType_420YpCbCr8BiPlanarVideoRange}
};
I run, however, a few more tests the other day and found a way to reproduce the problem:
Take a photo with the integrated PhotoBooth application, after that start a pjsip application.
Somehow the camera is put (persistently) into a different mode by this application - and maybe others. So it seems like there could be some "reset" procedure to ensure a clean state before asking for supported formats.
The camera will no longer report I420 if i start a Jitsi Client and show it's video configuration screen and then run my pjsip application.
So the I420 line in qt_fmts is maybe a good idea but taking care about the device mode would be better. ios_dev.m already includes I420, btw.
My environment: MacBook Retina 13" Late 2013, OS X 10.10.1, pjsip 2.3
Regards,
Thomas
