Do not return info on failed media file parse

If the media file failed to parse, returning a structure
with only contains nulls is not helpful, as it is
assumed a non-null structure represents a file.

Author: brarcher

app/src/main/java/protect/videotranscoder/FFmpegUtil.java

@@ -535,8 +535,14 @@ static MediaInfo parseMediaInfo(File mediaFile, String mediaDetailsJsonStr)
             }
         }
 
-        MediaInfo info = new MediaInfo(mediaFile, durationMs, container, videoCodec, videoResolution,
-                videoBitrateK, videoFramerate, audioCodec, audioSampleRate, audioBitrateK, audioChannels);
+        MediaInfo info = null;
+
+        if(container != null && (videoCodec != null || audioCodec != null))
+        {
+            info = new MediaInfo(mediaFile, durationMs, container, videoCodec, videoResolution,
+                    videoBitrateK, videoFramerate, audioCodec, audioSampleRate, audioBitrateK, audioChannels);
+        }
+
         return info;
     }