[Linphone-developers] Problem with Logitech Quickcam Pro 9000

[Mikko Tuumanen]

I get the following errors with the QC Pro 9000 and latest uvc driver
from svn:

ortp-error-Could not find decoder 12!
ortp-error-JPEGLS codec not found, retrying with MJPEG...

and sometimes:

ortp-error-Could not find decoder 12!
ortp-error-JPEGLS codec not found, retrying with MJPEG...
[mjpeg @ 0x2b21ac32e3d0]only 8 bits/component accepted
[mjpeg @ 0x2b21ac32e3d0]only 8 bits/component accepted
[mjpeg @ 0x2b21ac32e3d0]invalid id 199
[mjpeg @ 0x2b21ac32e3d0]mjpeg: unsupported coding type (c2)
[mjpeg @ 0x2b21ac32e3d0]only 8 bits/component accepted
[mjpeg @ 0x2b21ac32e3d0]only 8 bits/component accepted
[mjpeg @ 0x2b21ac32e3d0]mjpeg: unsupported coding type (cf)
[mjpeg @ 0x2b21ac32e3d0]mjpeg: unsupported coding type (c1)
[mjpeg @ 0x2b21ac32e3d0]mjpeg: unsupported coding type (cf)
[mjpeg @ 0x2b21ac32e3d0]mjpeg: unsupported coding type (c2)
[mjpeg @ 0x2b21ac32e3d0]picture size invalid (36872x59713)
[mjpeg @ 0x2b21ac32e3d0]only 8 bits/component accepted
[mjpeg @ 0x2b21ac32e3d0]mjpeg: unsupported coding type (cb)
[mjpeg @ 0x2b21ac32e3d0]mjpeg: unsupported coding type (c1)

There is a workaround for this problem: Receive uncompressed video from
the camera and it will work fine. Unfortunately that can only be done by
editing the source. I moved the 

        }else if (v4lv2_try_format(s,V4L2_PIX_FMT_YUYV)){ ... }

above the mjpeg in msv4l.c and get no more errors.

I'm not sure whether that change should be made to mediastreamer2 for
all users. Perhaps somebody has only usb1 and prefers compressed images
through the usb cable. Maybe you could use a configuration option,
environment variable, or something else to let users choose a preferred
format.