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Must be one or more of: MediaCodec.BUFFER_FLAG_SYNC_FRAME, MediaCodec.BUFFER_FLAG_KEY_FRAME, MediaCodec.BUFFER_FLAG_CODEC_CONFIG, MediaCodec.BUFFER_FLAG_END_OF_STREAM, MediaCodec.BUFFER_FLAG_PARTIAL_FRAME, MediaCodec.BUFFER_FLAG_DECODE_ONLY, but could be MediaExtractor.SAMPLE_FLAG_SYNC, MediaExtractor.SAMPLE_FLAG_ENCRYPTED, MediaExtractor.SAMPLE_FLAG_PARTIAL_FRAME