[FFmpeg-trac] #8474(avformat:open): rtcpport param doesn't add a=rtcp to SDP

[FFmpeg]

#8474: rtcpport param doesn't add a=rtcp to SDP
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             Reporter:  juannm      |                    Owner:
                 Type:  defect      |                   Status:  open
             Priority:  normal      |                Component:  avformat
              Version:  git-master  |               Resolution:
             Keywords:  rtp, sdp    |               Blocked By:
             Blocking:              |  Reproduced by developer:  0
Analyzed by developer:  0           |
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Comment (by juannm):

 Yes, the `a=rtcp` attribute is defined in RFC 3605. Technically it is
 optional when the RTCP port is just RTP + 1, but it should be included
 otherwise, or else consumers of the SDP file will wrongly assume that they
 should use RTP + 1 for the RTCP port.

 By the way this bug report goes hand to hand with the related one:
 https://trac.ffmpeg.org/ticket/8479
 which is about FFmpeg ignoring the `a=rtcp` attribute in input SDP files.

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Ticket URL: <https://trac.ffmpeg.org/ticket/8474#comment:8>
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