Zoom in when screen sharing.

ansible/roles/media/files/cast_file_vaapi

@@ -317,4 +317,32 @@ function encode_webcam {
         "rtsp://$USERNAME:$PASSWORD@172.16.16.251:8554/fetch"
 }
 
+function speed_up_preprocess_vp8 {
+    local file_to_cast file_to_save
+    file_to_cast="$1"
+    file_to_save="$2"
+
+    set -x
+
+    # -bf 0 :: Disable b-frames because webrtc doesn't support h264 streams with b-frames.
+    # -strict -2 :: Enable support for experimental codecs like opus.
+    # -b:v 2M :: Target 2 megabit/s
+    # -crf 10 :: Target a quality level and adjust bitrate accordingly. This should be preferred, but ideally both should be used.
+    # Could also use -filter_complex "[0:v]setpts=0.5*PTS[v];[0:a]atempo=2.0[a]" -map "[v]" -map "[a]"
+    </dev/null exec ffmpeg \
+               -i "$file_to_cast" \
+               -filter:v "setpts=0.66666666*PTS" \
+               -filter:a "atempo=1.5" \
+               -c:v vp8 \
+               -b:v 2M \
+               -crf 10 \
+               -bf 0 \
+               -c:a opus \
+               -b:a 320k \
+               -ar 48000 \
+               -strict -2 \
+               "$file_to_save"
+}
+
+
 main "${@}"