Description of the issue

This is the first frame in this stream but USAC AudioPreRoll is not present

Groups

General compliance
Best practice

References

ISO IEC 23003-3 (USAC):
AudioPreRoll: Not explicitly forbidden but in practice the first frames can not provide any valid decoded content due to the lack of previous frames which are needed for a valid decoded content for this frame

Possible solution/action

ISO IEC 23003-3:
Configure or update the USAC encoder in order to put the following count of pre-roll frames:
- 1 if no SBR
- 2 if SBR without harmonic patching
- 3 if SBR with harmonic patching
at least for the first frame then reencode the content

Severity

Warning