android webrtc远程视频jsep sdp包含；m=音频“；

我确实设置了包含视频的配置

sdpMediaConstraints.mandatory.add(
                new MediaConstraints.KeyValuePair("OfferToReceiveAudio", "true"));
        sdpMediaConstraints.mandatory.add(
                new MediaConstraints.KeyValuePair("OfferToReceiveVideo", "true"));

但是当作为子提升器连接到房间时，jsep只返回“m=音频…”，我希望它返回“m=视频”以显示视频，有人能帮我解决这个问题吗

这是jsep返回

v=0
o=- 1598587545508398 1 IN IP4 124.158.12.165
s=VideoRoom 687408157313
t=0 0
a=group:BUNDLE audio
a=msid-semantic: WMS janus
m=audio 9 UDP/TLS/RTP/SAVPF 111
c=IN IP4 124.158.12.165
a=sendonly
a=mid:audio
a=rtcp-mux
a=ice-ufrag:Vvjb
a=ice-pwd:zOWtUytpcFdy4ttLUr32Dg
a=ice-options:trickle
a=fingerprint:sha-256 10:C8:37:1B:1B:87:1B:0A:D7:AC:4A:CC:DF:44:B6:A4:59:EB:5F:EE:47:1F:A2:67:F8:DB:95:75:F9:93:C9:D2
a=setup:actpass
a=rtpmap:111 opus/48000/2
a=extmap:1 urn:ietf:params:rtp-hdrext:sdes:mid
a=rtcp-fb:111 transport-cc
a=msid:janus janusa0
a=ssrc:2217433846 cname:janus
a=ssrc:2217433846 msid:janus janusa0
a=ssrc:2217433846 mslabel:janus
a=ssrc:2217433846 label:janusa0
a=candidate:1 1 udp 2015363327 124.158.12.165 39581 typ host
a=candidate:1 1 udp 2015363327 10.0.0.11 39581 typ host
a=candidate:2 1 udp 2015363583 124.158.12.165 33928 typ host
a=candidate:2 1 udp 2015363583 172.19.0.1 33928 typ host
a=candidate:3 1 udp 2015364863 124.158.12.165 41721 typ host
a=candidate:3 1 udp 2015364863 172.17.0.1 41721 typ host
a=end-of-candidates