[Libav-user] RTSP SDP Parsing Error

[Andy Shaules]

On 3/4/2015 5:44 AM, Mark Kenna wrote:
>
> On 27 February 2015 at 19:38, Andy Shaules <bowljoman at gmail.com 
> <mailto:bowljoman at gmail.com>> wrote:
>
>     On 2/27/2015 9:09 AM, Mark Kenna wrote:
>>     On 13 February 2015 at 12:07, Mark Kenna
>>     <mark.kenna at sureviewsystems.com
>>     <mailto:mark.kenna at sureviewsystems.com>> wrote:
>>
>>         Hi
>>
>>         I think there is a problem in the SDP parsing of RTSP.c. I
>>         have an SDP which has 2 tracks, one is H264 and the other is
>>         MJPEG. It appears that FFMPEG is always opening MJPEG
>>         regardless of which codec is specified first in the track
>>         list. Here is an example:
>>
>>         v=0
>>         o=- 130683027881870000 130683027881870000 IN IP4 2.0.2.42
>>         s=Camera
>>         c=IN IP4 0.0.0.0
>>         t=0 0
>>         a=control:*
>>         m=video 1036 RTP/AVP 96 26
>>         a=control:?StreamID=0
>>         a=rtpmap:96 H264/90000
>>         a=fmtp:96 packetization-mode=1; profile-level-id=420029;
>>         sprop-parameter-sets=Z0IAKeKQLBLYEnBQEF4eJEVA,aM48gA==
>>         a=rtpmap:26 JPEG/90000
>>
>>         Thanks,
>>         Mark.
>>
>>
>>     Hi Guys
>>
>>     Did anyone see this issue? I was wondering if anyone has suffered
>>     the same problem?
>>
>>     Thanks,
>>     Mark.
>>
>>
>>
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>     Hello,
>
>
>     It appears the SDP is wrong. I believe there should be two m entries.
>
>     m=video 1036 RTP/AVP 96
>     a=control:?StreamID=0
>     a=rtpmap:96 H264/90000
>     a=fmtp:96 packetization-mode=1; profile-level-id=420029;
>     sprop-parameter-sets=Z0IAKeKQLBLYEnBQEF4eJEVA,aM48gA==
>     m=video 1036 RTP/AVP 26
>     a=control:?StreamID=0
>     a=rtpmap:26 JPEG/90000
>
>
>
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>
>
> Hi Andy
>
> According to the SDP specification you are allowed to have multiple 
> media values in the same m line. If you have information to the 
> contrary then please let me know.
>
> Appreciate the information!
>
> Mark.
>
>
>
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Yeah, I imagine that may be so, but the question if lib av actually 
supports that is another entirely. Can you tell? 
https://www.ffmpeg.org/doxygen/2.4/rtsp_8c_source.html


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