Use decoder values for screen recording size

Some lower end devices were recording videos at a resolution that could
not be played back on device. Using the decoder for the video format,
instead of querying all codecs, should result in a size that will be
playable on the device as is

Fixes: 167978946
Test: manual
Change-Id: Ib3ad7863c9399ba81c010943b2f8a39a27be84af