refactor(streamer): remove gstreamer and legacy rtmp paths

scripts/live_srs_forward_smoke.sh

@@ -17,7 +17,6 @@ CODEC="${CODEC:-h264}"
 ENCODER_BACKEND="${ENCODER_BACKEND:-ffmpeg}"
 ENCODER_DEVICE="${ENCODER_DEVICE:-nvidia}"
 RTMP_TRANSPORT="${RTMP_TRANSPORT:-libavformat}"
-RTMP_MODE="${RTMP_MODE:-enhanced}"
 INGEST_MAX_FRAMES="${INGEST_MAX_FRAMES:-120}"
 PROBE_TIMEOUT_S="${PROBE_TIMEOUT_S:-20}"
 DECODE_FRAMES="${DECODE_FRAMES:-15}"
@@ -58,10 +57,9 @@ Environment overrides:
   INPUT_URI           cvmmap source URI, if positional argument is omitted
   STREAM_NAME         RTMP/HTTP-FLV stream name, default derived from INPUT_URI
   CODEC               h264|h265
-  ENCODER_BACKEND     ffmpeg|gstreamer_legacy
+  ENCODER_BACKEND     auto|ffmpeg
   ENCODER_DEVICE      auto|nvidia|software
-  RTMP_TRANSPORT      libavformat|ffmpeg_process|legacy_custom
-  RTMP_MODE           enhanced|domestic
+  RTMP_TRANSPORT      libavformat|ffmpeg_process
   INGEST_MAX_FRAMES   bounded frame count for the smoke
   DECODE_FRAMES       frames to decode from HTTP-FLV after probe
   SRS_ROOT            local SRS checkout, default ~/Code/srs
@@ -198,7 +196,6 @@ fi
 	--rtmp \
 	--rtmp-url "$RTMP_URL" \
 	--rtmp-transport "$RTMP_TRANSPORT" \
-	--rtmp-mode "$RTMP_MODE" \
 	--ingest-max-frames "$INGEST_MAX_FRAMES" \
 	>"$STREAMER_LOG" 2>&1 &
 STREAMER_PID=$!