50     private MediaExtractor mExtractor = new MediaExtractor();  field in MainActivity
82             mExtractor.release();  in onPause()
107             mExtractor.setDataSource(this, videoUri, null);  in startPlayback()
108             int nTracks = mExtractor.getTrackCount();  in startPlayback()
113                 mExtractor.unselectTrack(i);  in startPlayback()
124                 mCodecWrapper = MediaCodecWrapper.fromVideoFormat(mExtractor.getTrackFormat(i),  in startPlayback()
127                     mExtractor.selectTrack(i);  in startPlayback()
145                     boolean isEos = ((mExtractor.getSampleFlags() & MediaCodec  in startPlayback()
152                         boolean result = mCodecWrapper.writeSample(mExtractor, false,  in startPlayback()
153                                 mExtractor.getSampleTime(), mExtractor.getSampleFlags());  in startPlayback()
158                             mExtractor.advance();  in startPlayback()
172                         mExtractor.release();  in startPlayback()