Why are null packets important in MPEG?

Question:

Why are null packets important in MPEG?

Answer:

Null packets, packets of "stuffing," carry no data but are necessary to maintain a constant bit rate with a variable payload. Null packets always have a PID of 8191 (all 1s).

This FAQ Applies to:

Product Series: MPEG Software, MPEG Analyzer

Applications: MPEG-2 / MPEG-4 / H.264

Product: MTS4SA, MTS400, MTS430

FAQ ID : 55151

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