Script to render a video of quantization effects in daala

visualize_quality_curve.sh

#!/bin/bash
readlinkf(){ perl -MCwd -e 'print Cwd::abs_path shift' "$1";}
DAALA_ROOT="$(readlinkf ${DAALA_ROOT:-.})"
INPUT_IMAGE="$(readlinkf $1)"
OUTPUT_VIDEO="$(readlinkf ${2:-$(basename "$INPUT_IMAGE").webm})"
cq="0 1 2 3 4 5 7 9 11 13 16 19 22 25 28 33 38 44 50 57 64 73 82 92 104 117 132 148 166 187 209 235 263 295 330 369 413 462"
P=${P:-4}
( 
  cd /tmp
  FIFOS="`echo -n $cq|sed 's/[0-9][0-9]*/&.y4m/g'`"
  rm -f $FIFOS
  mkfifo $FIFOS
  ( cat `echo $FIFOS | cut -f1 -d' '`; tail -n +2 -q `echo $FIFOS | cut -f2- -d' '`; rm $FIFOS ) &
  ( for v in $cq
    do
      (
        DIR=`mktemp -d /tmp/daala.XXXXXX`
        cd "$DIR"
        ln /tmp/"$v".y4m 00000000out-.y4m
        "$DAALA_ROOT"/examples/encoder_example -v$v "$INPUT_IMAGE" 2>/dev/null >/dev/null
        rm 00000000out-.y4m
        cd ..
        rmdir "$DIR"
      ) &
      [[ `jobs|wc -l` -lt $P ]] || wait
    done
    wait
  )
  wait
) |
ffmpeg -f yuv4mpegpipe -r 6 -i pipe: -pix_fmt yuv420p -vcodec libvpx-vp9 -lossless 1 -speed 0 -tile-columns 0 -frame-parallel 0 -f webm -y "$OUTPUT_VIDEO"