[Live-devel] Setting KLV codec

[Ross Finlayson]

> On Mar 11, 2022, at 6:07 AM, Weber, Patrick <Patrick.Weber at iecinfrared.com> wrote:
> 
> 
>>> What is the ?codec ID??
> 
> While I was hoping you'd know, I rather expected this response. Let me ask the customer which RFC/standard he's referring to & I'll get back with you. I suspect he's looking for a media description with codec name & ID; here's his question to me:
> 
> "When working with the video stream, the codec for the data stream is reported as "Data: none". This is easily seen with the FFMPEG tool (ffprobe rtsp://192.168.0.40/Primary). Generally when working with KLV data streams the codec should be set to KLV (id: 100356). When you create the stream is this something that you can specify?"

This doesn’t seem to have anything to do with the RTP stream (as defined, in this case, by RFC 6597 - which describes the RTP payload format for carrying this KLV data).  RFC 6597 doesn’t mention “codec” at all.

I suspect that the FFMPEG tool that your customer is using (“ffprobe”) just happens to not recognize this RTP payload format (“application/smpte336m”).  And then your customer is getting confused, and thinking that there’s a problem with the KLV data in the stream, when there isn’t.  His ‘problem’ is likely just with “ffprobe”.


Ross Finlayson
Live Networks, Inc.
http://www.live555.com/