Class Not Found Exception : org,mp4parser.boxes.iso.14496.part12.FileTypeBox.

[QL-Nisha-Rana]

Hi , I am getting the error on release build "Class Not Found Exception : org,mp4parser.boxes.iso.14496.part12.FileTypeBox."
I added these lines even after I am getting the error.
-keep class com.tencent.** { ; }
-keep class * implements com.coremedia.iso.boxes.Box { ; }
-dontwarn com.coremedia.iso.boxes.*
-dontwarn com.googlecode.mp4parser.authoring.tracks.mjpeg.**
-dontwarn com.googlecode.mp4parser.authoring.tracks.ttml.**
-keep class com.coremedia.iso.boxes.** { ; }
-keep class com.googlecode.mp4parser.boxes.mp4.ESDescriptorBox { ; }
-keep class $package. { *; }