Add software vp8 live cast.

ansible/roles/media/files/cast_file_vaapi

@@ -16,6 +16,8 @@ function main {
         h264 "${@}"
     elif [ "$cmd" = "software_h264" ]; then
         software_h264 "${@}"
+    elif [ "$cmd" = "software_vp8" ]; then
+        software_vp8 "${@}"
     elif [ "$cmd" = "preprocess_h264" ]; then
         preprocess_h264 "${@}"
     elif [ "$cmd" = "preprocess_vp8" ]; then
@@ -138,6 +140,35 @@ function preprocess_vp8 {
         "$file_to_save"
 }
 
+function software_vp8 {
+    local USERNAME PASSWORD
+    USERNAME="$1"
+    PASSWORD="$2"
+
+    local file_to_cast
+    file_to_cast="$3"
+
+    # -bf 0 :: Disable b-frames because webrtc doesn't support h264 streams with b-frames.
+    # -strict -2 :: Enable support for experimental codecs like opus.
+    # -b:v 1M :: Target 1 megabit/s
+    # -crf 10 :: Target a quality level and adjust bitrate accordingly. This should be preferred, but ideally both should be used.
+    exec ffmpeg \
+        -re \
+        -stream_loop -1 \
+        -i "$file_to_cast" \
+        -c:v vp8 \
+        -b:v 1M \
+        -crf 10 \
+        -bf 0 \
+        -c:a opus \
+        -b:a 320k \
+        -ar 48000 \
+        -strict -2 \
+        -f rtsp \
+        -rtsp_transport udp \
+        "rtsp://$USERNAME:$PASSWORD@172.16.16.251:8554/fetch"
+}
+
 function webcam {
     # Uses on-webcam h264 encoding.