H.264 over RTP - Identify SPS and PPS Frames

Question

I have a raw H.264 Stream from an IP Camera packed in RTP frames. I want to get raw H.264 data into a file so I can convert it with ffmpeg.

So when I want t

Answer 1

1. If the SPS and PPS do not change, you could omit them except the 1st ones.
2. You need to parse the nal_unit_type field of each NAL, for SPS, nal_unit_type==7; for PPS, nal_unit_type==8.

As I remember, nal_unit_type is the lower 5 bits of the 1st byte of a frame.

nal_unit_type = frame[0] & 0x1f;