視頻監控項目中遇到的各種問題

1 Tried to create an RTP packet which whould exceed the specified maximum packet size

2 WINDOWS上用CMAKE編譯jrtplib時 報錯src/rtptimeutilities.h invaild suffix ui64 on integer constant

 ui64 ->ull
3 同上，繼續編譯時間，int jrtplib::RTPComoundPacketBuilder::AddReportBlock(uint32_t,uint8_t,...):
 /src/rtcpcompoundpacketbuilder.cpp:239 error:no matching function for call to 'operator new [](unsigned int,jrtplib::rtpmemorymanager*,int)'

最後在linux下編譯成功。

4 指標使用前一定要 new;

5 ARM6410上：pixmap.load("test1.jpg");//執行這一句時段錯誤

6 glibc detected *** ./facecheck: malloc(): memory corruption: 0x000b2ac8
 原因：數組越界或像我這種情況：glibc detected *** ./facecheck: malloc(): memory corruption: 0x000b2ac8

7 OpenCV Error: Bad argument (Unknown array type) in cvarrToMat, file /home/src/OpenCV-2.3.1/modules/core/src/matrix.cpp, line 646
terminate called after throwing an instance of 'cv::Exception'
  what():  /home/src/OpenCV-2.3.1/modules/core/src/matrix.cpp:646: error: (-5) Unknown array type in function cvarrToMat

Aborted

8 this function is not available when using the rtp poll thread feature

9 RTP接收不到資料，原因防火牆沒關。

10 linux X11下打包QT應用程式時，出現：error while loading shared libraries:
 libjrtp.so.3.9.1:cannot open shared object file:No such file or directory
 原因，錯把ARM版的.so 當X86版本的so

11. 獲得本機IP Qsting msg = hostinfo.addresses().first().tostring() //結果是127。0。0。1
    clientsocket->peeraddress().tostring(); 

12 session.AddDestination（ADDR）後，用戶端沒有收到資料。the specified address is not a multicast address.

13 之前，調用session.poll()時，運行時報錯:this function is not available when using the rtp poll thead feature,可能是因為沒有支援多播。

14 RTP不能組播,原因是RTP 寄件者的transmitparams的連接埠號碼（非組播連接埠號碼）被TCP Server佔用， 另外注意組播IP地址224.0.0.0 ~239.255.255.255 其中224.0.0.0 ~224.0.0.255是被保留的地址。

15 unable to join the specified multicast group...

16 AddDestination("10.10.10.229:8800"); AddDestination("10.10.10.230:8880") ;//只有10.10.10.229能收到資料。

17 V4L2映像採集時，一幀圖片的真實大小儲存在V4L2_burrer結構的bytesused成員裡。但QImage 顯示時仍存在以下幾種錯誤：
 Corrupt JPEG data: premature end of data segment：資料無效
 Invalid JPEG file structure: two SOI markers：兩個映像開始標記smybol of image;
 Corrupt JPEG data: 17 extraneous bytes before marker 0xd9 :結束標記後面存在17個額外的位元組

> This is caused by QNetworkReplyImplPrivate never getting
"_q_copyReadyRead()"
> triggered again after assigning the IODevice. If there's more than 32k
of
> data, the function "nextDownstreamBlockSize()" still returns 32k. So
one would
> expect this function to be called again until the whole copy is
completed, but
> it's not.
>
> This makes the cache useless because it could only be used on small
files,
> which defeat its purpose.
最後用memcpy解決，深層原因還不清楚。

18:RTP session' portbase must be a even number.

19 configure ffmpeg時提示：c compiler test faild ，查看config.log 發現mcpu=arm is bad 將cpu=arm改成cpu=armv6解決

20 panitEvent 中 qpixmap->loadfromdata & qpixmap->drawpixmap 段錯誤。估計是記憶體溢出，改用QIMAGE 也是這樣，沒加入侵探測之前用的好好的。

21 輸出的AVI檔案不能播放。
  用UE一看，發現AVI檔案頭沒有寫入，寫入檔案頭是在avi_close_output_file函數裡完成的，為什麼要在關閉檔案是才寫入檔案頭？應該是在關閉檔案時才能確認AVI檔案的某些參數，如幀數。OPENCV 的用createVideoWriter（先寫檔案頭）和cvWriteFrame 方法最後也要releasevideo 這樣輸出的檔案頭才是正確的。

22 程式運行一段時間後程式異常退出OpenCV Error: Bad argument (Unknown array type) in cvarrToMat, file /home/src/OpenCV-2.3.1/modules/core/src/matrix.cpp, line 646
terminate called after throwing an instance of 'cv::Exception'
  what():  /home/src/OpenCV-2.3.1/modules/core/src/matrix.cpp:646: error: (-5) Unknown array type in function cvarrToMat
Aborted
It appears you need to create your output matrix. In your example, change the declaration of Mc from CvMat to CvMat* and initialize it: CvMat *Mc = cvCreateMat( 2, 2, CV_32FC1); I think this will work. The compiler can't catch uninitialized array, since static
type checking will pass

23 編寫PWM驅動的測試程式時，這樣編譯的話 arm-linux-gcc -o xxx -c xxx.c 程式在ARM上運行將出現這種錯誤:Syntax error: word unexpected (expecting ")") -c的意思是產生目標檔案而不是可執行檔，-O指定目標檔案名。

24 ARM應用程式傳一個結構體到核心驅動時，發現結構成員的值不對。例如傳一個pwm{unsgined long id,unsgind long freq,unsigned long duty}的結構到核心空間，後面兩個參數不對。 解決：以指標的方式傳遞。

25 段錯誤 編譯器版本原因。