All, I'm working on a project where I need to consume H.264 data streamed from a webcam via RTSP. This is remarkably easy with Live555! Many thanks to Ross and everyone else. I'm currently confused by a particular sequence of NAL units that I see in the stream over and over and was hoping that someone more knowledgeable than myself might have some insight for me. Here's some output from a DummySink:
video/H264: Received 10547 bytes. Presentation time: 1379699108.138589! audio/PCMU: Received 1024 bytes. Presentation time: 1379699108.189569! video/H264: Received 10962 bytes. Presentation time: 1379699108.178622! video/H264: Received 8651 bytes. Presentation time: 1379699108.218655! video/H264: Received 10621 bytes. Presentation time: 1379699108.258688! video/H264: Received 45 bytes. Presentation time: 1379699108.258688! video/H264: Received 4 bytes. Presentation time: 1379699108.258688! video/H264: Received 79400 bytes. Presentation time: 1379699108.298721! audio/PCMU: Received 1024 bytes. Presentation time: 1379699108.317569! ... video/H264: Received 10486 bytes. Presentation time: 1379699109.139414! audio/PCMU: Received 1024 bytes. Presentation time: 1379699109.213569! video/H264: Received 11426 bytes. Presentation time: 1379699109.179447! video/H264: Received 8681 bytes. Presentation time: 1379699109.219480! video/H264: Received 10878 bytes. Presentation time: 1379699109.259513! video/H264: Received 45 bytes. Presentation time: 1379699109.259513! video/H264: Received 4 bytes. Presentation time: 1379699109.259513! video/H264: Received 82291 bytes. Presentation time: 1379699109.299546! audio/PCMU: Received 1024 bytes. Presentation time: 1379699109.341569! etc.... What are the 45 and 4 byte NAL units that share the same presentation time as the preceding H.264 NAL unit? The payload of these 45 and 4 byte units is identical in every case: <674d0029 9a6280f0 044fcb35 01010140 0000fa40 003a983a 1800bb80 002ee06e f2e34300 17700005 dc0dde5c 28> and: <68ee3c80> respectively. Neither appears to be a start code or delimiter? I'm definitely outside of my sphere of knowledge, so any advice would be appreciated. Thanks! Mike
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