[FFmpeg-devel] avformat_find_stream_info() fails while reading rtsp stream

[Audric Ackermann]

On Fri, Oct 05, 2012 at 11:45:09AM +0200, Audric Ackermann wrote:

> Hi,

>

> I am currently developping an application for Android to read Mjpeg streams

> from a server which uses live555 to stream webcam.

>

> Firstly I try this :

>

>  if (avformat_open_input(&fmt_ctx, url, NULL, NULL) < 0) {

> LOGE("Could not open source file");

>         return 1;

>     }

>     else

> LOGI("File/url opened - OK");

> */

>     /* retrieve stream information */

>     if (avformat_find_stream_info(fmt_ctx, NULL) < 0) {

>         LOGE("Find streams informations - Fail");

>         return 1;

>     }

>     else

> LOGI("Find streams informations - OK");

>

>

> It works with url like

> rtsp://184.72.239.149/vod/mp4:BigBuckBunny_115k.mov(rtsp + h264), I

> can print image on the Android Application, but it fails

> in the opening with the server I use.

> I think it is because the server stream to multicast, so I had (found on

> Internet)

>

>        AVDictionary* options = NULL;

> av_dict_set(&options, "rtsp_transport", "udp_multicast", 0);

> ret = avformat_open_input(&fmt_ctx, url, 0, &options);

>

> if (ret!=0 || !fmt_ctx){

> LOGE("Source open - Fail");

> return 1;

> }

> else {

> LOGI("Source open - OK");

> }

>         if (avformat_find_stream_info(fmt_ctx, NULL) < 0) {

>                LOGE("Find streams informations - Fail");

>

> I can open the stream, but now it fails while finding streams information,

> and I don't understand why.

> Have I missed something ?

does it work with ffmpeg itself ?

where exactly does it fail in avformat_find_stream_info() ?



using ffmpeg alone, with this : ffmpeg -i rtsp://ownaddress:port/ I get :

[rtsp @ 0x32a0240] Nonmatching transport in server reply
rtsp://ownaddress:port/: Invalid data found when processing input

rtsp exchange :


OPTIONS rtsp://ip:port/ RTSP/1.0
CSeq: 1

RTSP/1.0 200 OK
CSeq: 1
Date: Mon, Oct 08 2012 09:07:24 GMT
Public: OPTIONS, DESCRIBE, SETUP, TEARDOWN, PLAY, PAUSE,
GET_PARAMETER, SET_PARAMETER

DESCRIBE  rtsp://ip:port/  RTSP/1.0
Accept: application/sdp
CSeq: 2

RTSP/1.0 200 OK
CSeq: 2
Date: Mon, Oct 08 2012 09:07:24 GMT
Content-Base:  rtsp://ip:port//
Content-Type: application/sdp
Content-Length: 328

v=0
o=- 1349687238058614 1 IN IP4 ip
s=Live Session streamed
i=testation
t=0 0
a=tool:LIVE555 Streaming Media v2010.04.09
a=type:broadcast
a=control:*
a=range:npt=0-
a=x-qt-text-nam:Live Session streamed
a=x-qt-text-inf:testation
m=video 7071 RTP/AVP 26
c=IN IP4 broadcast_address/255
b=AS:50
a=control:track1

SETUP  rtsp://ip:port//track1 RTSP/1.0
Transport: RTP/AVP/UDP;unicast;client_port=6862-6863
CSeq: 3

RTSP/1.0 200 OK
CSeq: 3
Date: Mon, Oct 08 2012 09:07:24 GMT
Transport: RTP/AVP;multicast;destination=broadcastAddress;source=ip;port=7071-0;ttl=255
Session: 456B88FC


It seems that ffmpeg ignore the multicast mode of the server. Is it
something to add to accept it ?
I don't know where avformat_find_streams_infos fails because I don't
redirect log from ffmpeg to android log. I'm going to do this...