added json parsing

tests/ffprobe_media_tests.rs

@@ -0,0 +1,17 @@
+extern crate serde_json;
+
+use serde_json::{Result, Value, from_str};
+
+use std::fs::File;
+use std::io::Read;
+
+#[test]
+fn test_a() {
+    let mut json_file = File::open("tests/ffprobe_media_results.json").unwrap();
+    let mut s = String::new();
+    json_file.read_to_string(&mut s).unwrap();
+    let v: Value = from_str(&mut s).unwrap();
+
+    //println!("file list: {:?}", ffprobe_data);
+
+}