[Live-devel] Problem with a=x-dimensions LIVE555 Proxy Server

[Yuri Timenkov]

Hi Ross,

x-dimensions header is required to work with resolutions > 2048. I saw 
some devices which relied on it for megapixel streaming (IIRC they just 
sent lower bits in standard JPEG over RTP header) and liveMedia handled 
this correctly if the header present.

Regards,
Yuri

On 04.06.2012 19:54, Ross Finlayson wrote:
>> After the RTSP connection IP-based cameras to send a reply with the
>> line "a=x-dimensions:640,480", but when you connect to LIVE555 Proxy
>> Server, this line is missing. For some decoders need to know the width
>> and height, and this is a problem.
>
> A camera should not depend upon its server including an 
> "a=x-dimensions..." SDP line, because this attribute is optional (and 
> not even a standard). All decoders should be able to infer the video 
> width and height from the encoded input stream, or from other 
> "a=fmtp:..." configuration parameters (which *are* standards).
>
> However, in the spirit of "be liberal in what you accept", I agree 
> that the "LIVE555 Proxy Server" should pass on this attribute if it 
> sees it.  So, a fix for this will be included in a future release of 
> the software.  (Be warned, however, that requests like this by 
> hobbyists are considered low priority.)
>
>
> Ross Finlayson
> Live Networks, Inc.
> http://www.live555.com/
>
>
>
> _______________________________________________
> live-devel mailing list
> live-devel at lists.live555.com
> http://lists.live555.com/mailman/listinfo/live-devel
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