Cloudflare api is publising the low quality stream even sending the high resolution
The published video track is 640x360 with a bitrate of 5.03 Mbps.
640x360 is the stats of outbound of the cloudflare peer connection

Our WebRTC application, built with flutter_webrtc and Cloudflare's Selective Forwarding Unit (SFU), is publishing a video track at 640x360 resolution with a bitrate of 5.03 Mbps, despite being explicitly configured to publish a 1080p (1920x1080) video track. The application requests user media with exact 1080p constraints, adds a single video track with 4 Mbps encoding, and sends it to Cloudflare's /apps/{appId}/sessions/{sessionId}/tracks/new endpoint. The goal is to publish only a 1080p video track (no audio or other resolutions) and subscribe to it. However, WebRTC stats show the published track is consistently 640x360.

Steps to Reproduce

Initialize WebRTC Session:

Use flutter_webrtc in a Flutter app to create a peer connection.

Connect to Cloudflare's SFU via https://rtc.live.cloudflare.com.

Request User Media:

Configure constraints for 1080p video, disabling audio:

{
'audio': false,
'video': {
'facingMode': 'user',
'width': {'exact': 1920},
'height': {'exact': 1080},
'frameRate': {'exact': 30},
},
}
Log confirms camera settings:

[log] Video track settings: width=1920, height=1080, frameRate=30

Add Video Track:

Add a single video track to the peer connection with encoding parameters:

RTCRtpTransceiverInit(
direction: TransceiverDirection.SendOnly,
sendEncodings: [
RTCRtpEncoding(
maxBitrate: 4000000, // 4 Mbps
minBitrate: 1500000,
scaleResolutionDownBy: 1.0, // No scaling
active: true,
),
],
)

Log confirms track settings before publishing:

[log] Video track settings in adding tracks api session: width=1920, height=1080, frameRate=30

Publish Track:

Create an SDP offer and send it to Cloudflare's /apps/{appId}/sessions/{sessionId}/tracks/new endpoint.

Publish the track via WebSocket with a trackPublished message.

Relevant code snippet from _addTrackToSession:

final requestBody = {
'sessionDescription': {'type': 'offer', 'sdp': completeSdp.sdp},
'tracks': [
{
'location': 'local',
'trackName': videoTrack.id,
'kind': 'video',
'sessionId': sessionId,
'mid': midValues.isNotEmpty ? midValues[0] : '0',
},
],
};
final response = await http.post(
Uri.parse('https://rtc.live.cloudflare.com/v1/apps/$_appId/sessions/$sessionId/tracks/new'),
headers: {
'Authorization': 'Bearer $_appSecret',
'Content-Type': 'application/json',
},
body: jsonEncode(requestBody),
);

Monitor Video Quality:

Use WebRTC stats to check the published track's resolution and bitrate:

final stats = await _peerConnection!.getStats();
for (var report in stats) {
if (report.type == 'outbound-rtp' && report.values['mediaType'] == 'video') {
final width = report.values['frameWidth'] ?? 0;
final height = report.values['frameHeight'] ?? 0;
final bitrate = report.values['bytesSent'] != null
? (report.values['bytesSent'] * 8 / 1000000).toStringAsFixed(2)
: 'unknown';
dev.log("Published video quality: ${width}x${height}, bitrate: $bitrate Mbps");
}
}

Expected Behavior

The published video track should be 1920x1080 (1080p) with a bitrate around 4 Mbps.

Logs should show:

[log] Video track settings: width=1920, height=1080, frameRate=30
[log] Published video quality: 1920x1080, bitrate: ~4.00 Mbps

Actual Behavior

The published video track is 640x360 with a bitrate of 5.03 Mbps.

Logs show:

[log] Attempting to set exact video constraints: 1920x1080 @ 30fps (1080p)...
[log] Video track settings: width=1920, height=1080, frameRate=30
[log] Video track settings in adding tracks api session: width=1920, height=1080, frameRate=30
[log] Published video quality: 640x360, bitrate: 5.03 Mbps

How can i fix this to publised the same video tracks quality to cloudflare sfu or turn