diff --git a/nix/configuration/roles/media/files/cast_file_vaapi b/nix/configuration/roles/media/files/cast_file_vaapi
index 9c41665..d1b179f 100644
--- a/nix/configuration/roles/media/files/cast_file_vaapi
+++ b/nix/configuration/roles/media/files/cast_file_vaapi
@@ -6,6 +6,7 @@ DIR="$( cd "$( dirname "${BASH_SOURCE[0]}" )" && pwd )"
 
 : ${VIDEO_BITRATE:="1M"} # Only for encoding modes targeting bitrate
 : ${AUDIO_BITRATE:="192k"}
+: ${SPEED:="1"}
 
 ############## Setup #########################
 
@@ -62,6 +63,8 @@ function copy {
         "rtsp://$USERNAME:$PASSWORD@172.16.16.251:8554/fetch"
 }
 
+# benchmark vulkan decode:
+# ffmpeg -init_hw_device "vulkan=vk:0" -hwaccel vulkan -hwaccel_output_format vulkan -i INPUT -f null - -benchmark
 function convert {
     local args=()
     local acceleration_type="$1" # "software" or "hardware"
@@ -99,11 +102,23 @@ function convert {
     if [ "$acceleration_type" == "software" ]; then
         true
     elif [ "$acceleration_type" == "hardware" ]; then
-        args+=(-vaapi_device /dev/dri/renderD128)
+        if [ "$codec" == "h264" ]; then
+            args+=(-init_hw_device vulkan)
+        elif [ "$codec" == "av1" ]; then
+            args+=(-vaapi_device /dev/dri/renderD128)
+        fi
     fi
 
     args+=(-i "$file_to_cast")
 
+    if [ "$SPEED" != "1" ]; then
+        local audio_speed video_speed
+        video_speed=$(bc -l <<< "1/${SPEED}")
+        audio_speed=$(bc -l <<< "${SPEED}/1")
+        args+=(-filter:v "setpts=${video_speed}*PTS")
+        args+=(-filter:a "atempo=${audio_speed}")
+    fi
+
     if [ "$codec" == "h264" ]; then
         if [ "$acceleration_type" == "software" ]; then
             args+=(-c:v h264)
@@ -111,7 +126,7 @@ function convert {
             args+=(-b:v "$VIDEO_BITRATE")
         elif [ "$acceleration_type" == "hardware" ]; then
             args+=(-vf 'format=nv12|vaapi,hwupload')
-            args+=(-c:v h264_vaapi)
+            args+=(-c:v h264_vulkan)
             args+=(-profile:v high)
             args+=(-b:v "$VIDEO_BITRATE")
         fi
@@ -119,12 +134,14 @@ function convert {
         if [ "$acceleration_type" == "software" ]; then
             args+=(-c:v libsvtav1)
             args+=(-preset 4) # [0-13] default 10, lower = higher quality / slower encode
-            args+=(-crf 20) # [0-63] default 35, lower = higher quality / larger file
+            # args+=(-crf 20) # [0-63] default 35, lower = higher quality / larger file
             # Parameters: https://gitlab.com/AOMediaCodec/SVT-AV1/-/blob/master/Docs/Parameters.md
             # fast-decode [0-2] default 0 (off), higher = faster decode
             # tune [0-2] default 1, Specifies whether to use PSNR or VQ as the tuning metric [0 = VQ, 1 = PSNR, 2 = SSIM]
             # film-grain-denoise, setting to 0 uses the original frames instead of denoising the film grain
-            args+=(-svtav1-params "fast-decode=1:film-grain-denoise=0")
+            # rc 1 = vbr 2 = cbr
+            # tbr = average bitrate
+            args+=(-svtav1-params "fast-decode=1:film-grain-denoise=0:tbr=${VIDEO_BITRATE}:rc=1:passes=2")
         elif [ "$acceleration_type" == "hardware" ]; then
             # -c:v av1_amf -quality quality
             args+=(-vf 'format=nv12|vaapi,hwupload')
@@ -206,32 +223,4 @@ function encode_webcam {
         "rtsp://$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 \
-               "$file_to_save"
-}
-
-
 main "${@}"