I have an RTSP video stream encoded by h264 that carries camera's timestamps inside SEI NAL units. I'm not sure where those units are exactly located, but I have an example of how to output them using a patch for ffmpeg:
libavcodec/h2645_parse.c: ... + #include <inttypes.h> ... static int h264_parse_nal_header(H2645NAL *nal, void *logctx) nal->ref_idc = get_bits(gb, 2); nal->type = get_bits(gb, 5); + if( nal->type == 6 ) { + uint64_t* ts = (uint64_t*)(nal->data+3); + av_log(logctx, AV_LOG_DEBUG, + "nal_unit_type: %d(%s), nal_ref_idc: %d, ts: %"PRId64"\n", + nal->type, h264_nal_unit_name(nal->type), nal->ref_idc, *ts ); + return 1; + } After applying this patch ffmpeg starts showing timestamps that I need. Is it possible to decode those timestamps alongside with video frames using libav* libraries? Since I'm not a video or C programming expert, ideally I'd like to do it using Python (OpenCV or PyAV), but any help is appreciated. -- Andrey
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