Merge "stagefright: add -P pixelformat flag for -t (thumbnail) option in stagefright" am: a7fb63b84d am: 88df2b87fa

Original change: https://android-review.googlesource.com/c/platform/frameworks/av/+/1964479

Change-Id: I0b62c88bd0212907d344e028e3e809a528415fbf