fix(video): use relay-default stream for room video

crates/wzp-video/src/transport.rs

@@ -63,7 +63,11 @@ pub fn packetize_video_frame(
             flags,
             media_type: MediaType::Video,
             codec_id,
-            stream_id: 1, // stream 0 = audio, 1 = video
+            // Legacy relays default receivers to video layer 0. Use video stream
+            // 0 for the single-layer room-video path so packets are forwarded
+            // before any receiver quality state exists. Audio is separated by
+            // media_type, so stream_id 0 does not collide with audio packets.
+            stream_id: 0,
             fec_ratio: 0,
             seq: *seq,
             timestamp: timestamp_ms,
@@ -188,6 +192,7 @@ mod tests {
         assert!(pkts[0].header.is_keyframe());
         assert!(pkts[0].header.is_frame_end());
         assert_eq!(pkts[0].header.media_type, MediaType::Video);
+        assert_eq!(pkts[0].header.stream_id, 0);
 
         let mut reassembler = VideoReassembler::new();
         let result = reassembler.push(&pkts[0]);

desktop/src-tauri/src/engine.rs

@@ -1212,6 +1212,7 @@ impl CallEngine {
                                         "t_ms": recv_t0.elapsed().as_millis() as u64,
                                         "codec": format!("{:?}", pkt.header.codec_id),
                                         "payload_bytes": pkt.payload.len(),
+                                        "stream_id": pkt.header.stream_id,
                                     }),
                                 );
                             }
@@ -1943,6 +1944,7 @@ impl CallEngine {
                                 "first_pkt_bytes": pkts[0].payload.len(),
                                 "last_pkt_bytes": pkts.last().map(|pkt| pkt.payload.len()).unwrap_or(0),
                                 "encoded_bytes": encoded.len(),
+                                "stream_id": pkts[0].header.stream_id,
                                 "is_keyframe": is_keyframe,
                             }),
                         );
@@ -2461,6 +2463,7 @@ impl CallEngine {
                                         "t_ms": recv_t0.elapsed().as_millis() as u64,
                                         "codec": format!("{:?}", pkt.header.codec_id),
                                         "payload_bytes": pkt.payload.len(),
+                                        "stream_id": pkt.header.stream_id,
                                     }),
                                 );
                             }
@@ -3042,6 +3045,7 @@ impl CallEngine {
                                 "first_pkt_bytes": pkts[0].payload.len(),
                                 "last_pkt_bytes": pkts.last().map(|pkt| pkt.payload.len()).unwrap_or(0),
                                 "encoded_bytes": encoded.len(),
+                                "stream_id": pkts[0].header.stream_id,
                                 "is_keyframe": is_keyframe,
                             }),
                         );