I'm experiencing this bug or at least a very similar one, my actual result is that after waking up the phone the video starts to play instead of being paused:
current build number: 420 device name: krillin channel: ubuntu-touch/rc-proposed/bq-aquaris.en last update: 2016-09-01 12:30:57 version version: 420 version ubuntu: 20160901 version device: 20160606-ab415b2 version custom: 20160824-991-38-17 video attached -- You received this bug notification because you are a member of Ubuntu Touch seeded packages, which is subscribed to mediaplayer-app in Ubuntu. https://bugs.launchpad.net/bugs/1535517 Title: Mediaplayer-app doesn't pause if lock the phone right after launching it Status in mediaplayer-app package in Ubuntu: Confirmed Bug description: Test Environment: $ system-image-cli -i current build number: 40 device name: krillin channel: ubuntu-touch/rc/bq-aquaris.en last update: 2016-01-19 02:38:56 version version: 40 version ubuntu: 20160118 version tag: OTA-9-rc version device: 20160108-efc96d8 version custom: 20160111-926-36--vivid Steps: 1.Play a video from the video scope 2.While mediaplayer-app is loading, press the power button 3.Wait a while and check 4.Unlock the screen, going back to mediaplayer-app Actual result: Meidaplayer-app continues playing the video while screen is locked Expected result: Mediaplayer-app should be paused and the video output window should show a still image from the video (if not on a black frame) To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/mediaplayer-app/+bug/1535517/+subscriptions -- Mailing list: https://launchpad.net/~touch-packages Post to : [email protected] Unsubscribe : https://launchpad.net/~touch-packages More help : https://help.launchpad.net/ListHelp

