CLONE - "media-capture" bugs with WP8.1

this is my original screenshot
http://www.littlebau.com/20141013_wp/01.png

issue 1
when I execute
navigator.device.capture.captureAudio(captureSuccess, captureError, options);
it will show this
http://www.littlebau.com/20141013_wp/02.png

if I press "start"，the duration will run，but if I press "take"...nothing real happened
if I press the hardware "backbutton"，but it will not trigger the "captureError" callback

issue 2
when I execute
navigator.device.capture.captureImage(captureSuccess, captureError, options);
it will show the user interface to do some function
but...

if I press the "backbutton"，it although trigger the "captureError" callback，but get the "error.code" => undefined

issue 3
when I execute
navigator.device.capture.captureVideo(captureSuccess, captureError, options);
it will show the user interface to do some function
http://www.littlebau.com/20141013_wp/03.png
but...

if I press "record" button，sometimes it will become black screen
http://www.littlebau.com/20141013_wp/04.png
and when change back to my app，my webview become so strang and very small (immediately press the "backbutton" will cause the same situation)
http://www.littlebau.com/20141013_wp/05.png