How and why v4l2src able to take YV12 format?

[jeyp4]

Wow, wonderful answer.

I have 2 queries:

1. In version < 1.14, How format=YV12 was working?
    
    I mean my usb device capability is MJPG 1280x720 at 60fps and YUYV
1280x720 at 5fps (in USB2 connection). Although if I set 
v4l2src video/x-raw, format=YV12
 in pipeline, it can work at 60 fps even in USB2 connection.

So what I can infer is, pipeline is performing 
jpegdec ! videoconvert
 inherently. Am i correct?

2. How to see current value of 
GST_V4L2_USE_LIBV4L2
 in any system?
How to modify current value of 
GST_V4L2_USE_LIBV4L2
 in any system?



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