RTP H.264 Packet Depacketizer

Question

Usually for videos the marker bit of RTP Packet indicates the last packet of the RTP. So, with this it is guaranteed that I will receive 1 frame per packet or can receive more than one?

In the case beyond the depacketization I would have to make a parser to separate the H.264 frames?

If I can get more than one frame per RTP ​​packetit is possible to get a piece of the next frame? Or all frames within the RTP packet even if more than one are completes?

Best regards,

Answer 1

RFC 6184 "RTP Payload Format for H.264 Video" has answers for the raised questions. It can be both ways: 2+ NAL units per packet, and 1 NAL unit fragmented over 2+ packets.

See quotes below:

5.7.1. Single-Time Aggregation Packet (STAP)

A single-time aggregation packet (STAP) SHOULD be used whenever NAL units are aggregated that all share the same NALU-time.

and

5.8. Fragmentation Units (FUs)

This payload type allows fragmenting a NAL unit into several RTP packets. Doing so on the application layer instead of relying on lower-layer fragmentation (e.g., by IP) has the following advantages: