Does the real encoding.

vpx-encode-2pass-hq (text/plain), 366 bytes, created by Luis Fernando Schultz Xavier da Silveira on 2011-01-25 03:02:16 UTC

#!/bin/bash

input="$1"
output="$2"
bitrate="$3"

tmp="`mktemp`"
ffmpeg -i "$input" -f yuv4mpegpipe - | \
  vpxenc-hq - -o "$output" \
    --target-bitrate=$((bitrate/1000)) \
    --fpf="$tmp" \
    --pass=1
ffmpeg -i "$input" -f yuv4mpegpipe - | \
  vpxenc-hq - -o "$output" \
    --target-bitrate=$((bitrate/1000)) \
    --fpf="$tmp" \
    --pass=2
rm -v "$tmp"