Empfangen von RTP-Paketen nach RTSP-Setup

Ich versuche, RTP-Pakete von einer IP-Kamera mit Python zu streamen.

Ich bin in der Lage, die beschreibenden, Setup & Play-Befehle mit RTSP-Protokoll zu senden, aber ich bin nicht in der Lage zu starten Streaming der tatsächlichen Videostream mit RTP.

Hier ist der Code:

import socket def printrec(recst): recs=recst.split('\r\n') for rec in recs: print rec dest="DESCRIBE rtsp://admin:12345@ RTSP/1.0\r\nCSeq: 2\r\nUser-Agent: python\r\nAccept: application/sdp\r\n\r\n" setu="SETUP rtsp://admin:12345@ RTSP/1.0\r\nCSeq: 3\r\nUser-Agent: python\r\nTransport: RTP/AVP;unicast;client_port=60784-60785\r\n\r\n" play="PLAY rtsp://admin:12345@ RTSP/1.0\r\nCSeq: 5\r\nUser-Agent: python\r\nSession: SESID\r\nRange: npt=0.000-\r\n\r\n" # .. here SESID will be substituted with the session id that SETUP returns us .. ip="" s=socket.socket(socket.AF_INET, socket.SOCK_STREAM) s.connect((ip,554)) s.send(dest) recst=s.recv(4096) printrec(recst) # etc. then the same for the strins "setu" and "play" .... 

Setup antwortet mich:

 RTSP/1.0 200 OK CSeq: 3 Session: 1117448817;timeout=60 Transport: RTP/AVP;unicast;client_port=60784-60785;server_port=8214-8215;ssrc=40d35c30;mode="play" Date: Mon, Jan 19 2015 11:10:08 GMT 

So haben wir die Client-Ports 60784 und 60785 und die Server-Ports 8214 und 8215.

Als nächstes antwortet mich:

 RTSP/1.0 200 OK CSeq: 5 Session: 1117448817 RTP-Info: url=rtsp://admin:12345@;seq=3539; rtptime=16026930 Date: Mon, Jan 19 2015 11:10:08 GMT 

Als nächstes soll ich das machen, um RTP-Pakete zu erhalten? Öffnen Sie eine UDP-Steckdose wie folgt ..?

 sock = socket.socket(socket.AF_INET, socket.SOCK_DGRAM) # UDP sock.bind((ip, serverport)) sock.recv(4096) 

Aber ich bekomme nichts … (es steht)

Entschuldigen Sie mir meine schlechte Kenntnis der Steckdosen ..!

One Solution collect form web for “Empfangen von RTP-Paketen nach RTSP-Setup”


Nach schweren Sessions von googeln und wireshark-Analyse kam ich mit den richtigen Lösungen.

Ich poste den daraus resultierenden Demo-Code hier .. Ich dachte, es wäre nützlich für die Community.

Wenn du jemals wollte, um IP-Cams mit Python zu lesen und den H264-Stream in eine essbare Datei zu legen, das ist die Sache, die du suchst.


 """ A demo python code that .. 1) Connects to an IP cam with RTSP 2) Draws RTP/NAL/H264 packets from the camera 3) Writes them to a file that can be read with any stock video player (say, mplayer, vlc & other ffmpeg based video-players) Done for educative/demonstrative purposes, not for efficiency..! written 2015 by Sampsa Riikonen. """ import socket import re import bitstring # if you don't have this from your linux distro, install with "pip install bitstring" # ************************ FOR QUICK-TESTING EDIT THIS AREA ********************************************************* ip="" # IP address of your cam adr="rtsp://admin:12345@" # username, passwd, etc. clientports=[60784,60785] # the client ports we are going to use for receiving video fname="stream.h264" # filename for dumping the stream rn=5000 # receive this many packets # After running this program, you can try your file defined in fname with "vlc fname" or "mplayer fname" from the command line # you might also want to install h264bitstream to analyze your h264 file # ******************************************************************************************************************* dest="DESCRIBE "+adr+" RTSP/1.0\r\nCSeq: 2\r\nUser-Agent: python\r\nAccept: application/sdp\r\n\r\n" setu="SETUP "+adr+"/trackID=1 RTSP/1.0\r\nCSeq: 3\r\nUser-Agent: python\r\nTransport: RTP/AVP;unicast;client_port="+str(clientports[0])+"-"+str(clientports[1])+"\r\n\r\n" play="PLAY "+adr+" RTSP/1.0\r\nCSeq: 5\r\nUser-Agent: python\r\nSession: SESID\r\nRange: npt=0.000-\r\n\r\n" # File organized as follows: # 1) Strings manipulation routines # 2) RTP stream handling routine # 3) Main program # *** (1) First, some string searching/manipulation for handling the rtsp strings *** def getPorts(searchst,st): """ Searching port numbers from rtsp strings using regular expressions """ pat=re.compile(searchst+"=\d*-\d*") pat2=re.compile('\d+') mstring=pat.findall(st)[0] # matched string .. "client_port=1000-1001" nums=pat2.findall(mstring) numas=[] for num in nums: numas.append(int(num)) return numas def getLength(st): """ Searching "content-length" from rtsp strings using regular expressions """ pat=re.compile("Content-Length: \d*") pat2=re.compile('\d+') mstring=pat.findall(st)[0] # matched string.. "Content-Length: 614" num=int(pat2.findall(mstring)[0]) return num def printrec(recst): """ Pretty-printing rtsp strings """ recs=recst.split('\r\n') for rec in recs: print rec def sessionid(recst): """ Search session id from rtsp strings """ recs=recst.split('\r\n') for rec in recs: ss=rec.split() # print ">",ss if (ss[0].strip()=="Session:"): return int(ss[1].split(";")[0].strip()) def setsesid(recst,idn): """ Sets session id in an rtsp string """ return recst.replace("SESID",str(idn)) # ********* (2) The routine for handling the RTP stream *********** def digestpacket(st): """ This routine takes a UDP packet, ie a string of bytes and .. (a) strips off the RTP header (b) adds NAL "stamps" to the packets, so that they are recognized as NAL's (c) Concantenates frames (d) Returns a packet that can be written to disk as such and that is recognized by stock media players as h264 stream """ startbytes="\x00\x00\x00\x01" # this is the sequence of four bytes that identifies a NAL packet.. must be in front of every NAL packet. bt=bitstring.BitArray(bytes=st) # turn the whole string-of-bytes packet into a string of bits. Very unefficient, but hey, this is only for demoing. lc=12 # bytecounter bc=12*8 # bitcounter version=bt[0:2].uint # version p=bt[3] # P x=bt[4] # X cc=bt[4:8].uint # CC m=bt[9] # M pt=bt[9:16].uint # PT sn=bt[16:32].uint # sequence number timestamp=bt[32:64].uint # timestamp ssrc=bt[64:96].uint # ssrc identifier # The header format can be found from: # https://en.wikipedia.org/wiki/Real-time_Transport_Protocol lc=12 # so, we have red twelve bytes bc=12*8 # .. and that many bits print "version, p, x, cc, m, pt",version,p,x,cc,m,pt print "sequence number, timestamp",sn,timestamp print "sync. source identifier",ssrc # st=f.read(4*cc) # csrc identifiers, 32 bits (4 bytes) each cids=[] for i in range(cc): cids.append(bt[bc:bc+32].uint) bc+=32; lc+=4; print "csrc identifiers:",cids if (x): # this section haven't been tested.. might fail hid=bt[bc:bc+16].uint bc+=16; lc+=2; hlen=bt[bc:bc+16].uint bc+=16; lc+=2; print "ext. header id, header len",hid,hlen hst=bt[bc:bc+32*hlen] bc+=32*hlen; lc+=4*hlen; # OK, now we enter the NAL packet, as described here: # # https://tools.ietf.org/html/rfc6184#section-1.3 # # Some quotes from that document: # """ 5.3. NAL Unit Header Usage The structure and semantics of the NAL unit header were introduced in Section 1.3. For convenience, the format of the NAL unit header is reprinted below: +---------------+ |0|1|2|3|4|5|6|7| +-+-+-+-+-+-+-+-+ |F|NRI| Type | +---------------+ This section specifies the semantics of F and NRI according to this specification. """ """ Table 3. Summary of allowed NAL unit types for each packetization mode (yes = allowed, no = disallowed, ig = ignore) Payload Packet Single NAL Non-Interleaved Interleaved Type Type Unit Mode Mode Mode ------------------------------------------------------------- 0 reserved ig ig ig 1-23 NAL unit yes yes no 24 STAP-A no yes no 25 STAP-B no no yes 26 MTAP16 no no yes 27 MTAP24 no no yes 28 FU-A no yes yes 29 FU-B no no yes 30-31 reserved ig ig ig """ # This was also very usefull: # http://stackoverflow.com/questions/7665217/how-to-process-raw-udp-packets-so-that-they-can-be-decoded-by-a-decoder-filter-i # A quote from that: """ First byte: [ 3 NAL UNIT BITS | 5 FRAGMENT TYPE BITS] Second byte: [ START BIT | RESERVED BIT | END BIT | 5 NAL UNIT BITS] Other bytes: [... VIDEO FRAGMENT DATA...] """ fb=bt[bc] # ie "F" nri=bt[bc+1:bc+3].uint # "NRI" nlu0=bt[bc:bc+3] # "3 NAL UNIT BITS" (ie [F | NRI]) typ=bt[bc+3:bc+8].uint # "Type" print "F, NRI, Type :", fb, nri, typ print "first three bits together :",bt[bc:bc+3] if (typ==7 or typ==8): # this means we have either an SPS or a PPS packet # they have the meta-info about resolution, etc. # more reading for example here: # http://www.cardinalpeak.com/blog/the-h-264-sequence-parameter-set/ if (typ==7): print ">>>>> SPS packet" else: print ">>>>> PPS packet" return startbytes+st[lc:] # .. notice here that we include the NAL starting sequence "startbytes" and the "First byte" bc+=8; lc+=1; # let's go to "Second byte" # ********* WE ARE AT THE "Second byte" ************ # The "Type" here is most likely 28, ie "FU-A" start=bt[bc] # start bit end=bt[bc+2] # end bit nlu1=bt[bc+3:bc+8] # 5 nal unit bits if (start): # OK, this is a first fragment in a movie frame print ">>> first fragment found" nlu=nlu0+nlu1 # Create "[3 NAL UNIT BITS | 5 NAL UNIT BITS]" head=startbytes+nlu.bytes # .. add the NAL starting sequence lc+=1 # We skip the "Second byte" if (start==False and end==False): # intermediate fragment in a sequence, just dump "VIDEO FRAGMENT DATA" head="" lc+=1 # We skip the "Second byte" elif (end==True): # last fragment in a sequence, just dump "VIDEO FRAGMENT DATA" head="" print "<<<< last fragment found" lc+=1 # We skip the "Second byte" if (typ==28): # This code only handles "Type" = 28, ie "FU-A" return head+st[lc:] else: raise(Exception,"unknown frame type for this piece of s***") # *********** (3) THE MAIN PROGRAM STARTS HERE **************** # Create an TCP socket for RTSP communication # further reading: # https://docs.python.org/2.7/howto/sockets.html s=socket.socket(socket.AF_INET, socket.SOCK_STREAM) s.connect((ip,554)) # RTSP should peek out from port 554 print print "*** SENDING DESCRIBE ***" print s.send(dest) recst=s.recv(4096) print print "*** GOT ****" print printrec(recst) print print "*** SENDING SETUP ***" print s.send(setu) recst=s.recv(4096) print print "*** GOT ****" print printrec(recst) idn=sessionid(recst) serverports=getPorts("server_port",recst) clientports=getPorts("client_port",recst) print "****" print "ip,serverports",ip,serverports print "****" s1=socket.socket(socket.AF_INET, socket.SOCK_DGRAM) s1.bind(("", clientports[0])) # we open a port that is visible to the whole internet (the empty string "" takes care of that) s1.settimeout(5) # if the socket is dead for 5 s., its thrown into trash # further reading: # https://wiki.python.org/moin/UdpCommunication # Now our port is open for receiving shitloads of videodata. Give the camera the PLAY command.. print print "*** SENDING PLAY ***" print play=setsesid(play,idn) s.send(play) recst=s.recv(4096) print print "*** GOT ****" print printrec(recst) print print print "** STRIPPING RTP INFO AND DUMPING INTO FILE **" f=open(fname,'w') for i in range(rn): print print recst=s1.recv(4096) print "read",len(recst),"bytes" st=digestpacket(recst) print "dumping",len(st),"bytes" f.write(st) f.close() # Before closing the sockets, we should give the "TEARDOWN" command via RTSP, but I am feeling lazy today (after googling, wireshark-analyzing, among other-things). s.close() s1.close() 
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