Reduce memory usage by some extractors.

Occurs for some extractors that use shared memory without MediaBufferObserver.
Check with high resolution MKV.

Play a mkv file continuously and check file descriptor count.
adb shell lsof | grep mediae | wc
adb shell lsof | grep medias | wc

Test: Photos with mkv.
Bug: 36359517
Change-Id: I8719b628406a838ee091499347b219a8a4736a25
Signed-off-by: yuedl1 <yuedl1@lenovo.com>