Merge "stagefright: add -P pixelformat flag for -t (thumbnail) option in stagefright" am: a7fb63b84d am: 88df2b87fa am: e78ca40aab am: 8fc3bb696d

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

Change-Id: I6504dde61c0cec972fa93ebd0da15a1f86ad43ed