Description of the issue

usacIndependencyFlag is 0 for first UsacFrame inside AudioPreRoll


ISO IEC 23003-3 (USAC):
usacIndependencyFlag: "The pre-roll frames with index “0” shall be independently decodable, i.e., usacIndependencyFlag shall be set to “1”."

Possible solution/action

ISO IEC 23003-3:
Fix the USAC encoder in order to correctly fill the first AudioPreRoll frame of this frame with a frame having usacIndependencyFlag set to 1, then re-encode the content.