43 lines
1.6 KiB
Bash
Executable File
43 lines
1.6 KiB
Bash
Executable File
#!/bin/bash
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# C5: per-codec FPS at N=3 runs. Wall-time measurement, no output file written.
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set -u
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OUT=$HOME/measurements/p3
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mkdir -p $OUT
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codecs=("h264:h264.mp4" "vp8:vp8.webm" "mpeg2:mpeg2.ts")
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for spec in "${codecs[@]}"; do
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codec=${spec%%:*}; ext=${spec#*:}
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cf=$HOME/measurements/encoded/bbb_60s_720p.${ext}
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log=$OUT/bench_${codec}.log
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> $log
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echo "=== $codec ===" | tee $log
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for run in 1 2 3; do
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t0=$(date +%s.%N)
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out=$(LIBVA_DRIVER_NAME=v4l2_request timeout 30 ffmpeg -hide_banner -benchmark -loglevel error \
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-hwaccel vaapi -hwaccel_output_format vaapi \
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-i "$cf" -vf "hwdownload,format=nv12" -f null - 2>&1 </dev/null)
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t1=$(date +%s.%N)
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el=$(awk "BEGIN { printf \"%.3f\", $t1-$t0 }")
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fps_calc=$(awk "BEGIN { printf \"%.2f\", 1440.0 / ($t1-$t0) }")
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fps_self=$(echo "$out" | grep -oE "fps=[ ]*[0-9.]+" | tail -1 | awk -F= "{print \$2}" | tr -d " ")
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frames=$(echo "$out" | grep -oE "frame=[ ]*[0-9]+" | tail -1 | awk -F= "{print \$2}" | tr -d " ")
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bench=$(echo "$out" | grep "^bench:" | tail -1)
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echo " run $run: elapsed=${el}s fps_calc=$fps_calc fps_self=$fps_self frames=$frames" | tee -a $log
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[ -n "$bench" ] && echo " $bench" | tee -a $log
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done
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# Compute mean and stddev
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awk '/^ run/ { gsub("elapsed=","",$3); gsub("s","",$3); el[NR]=$3; sum+=$3; n++ }
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END {
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if (n>0) {
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mean=sum/n
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for (i in el) ss += (el[i]-mean)^2
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sd=sqrt(ss/n)
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printf " N=%d mean=%.3fs sigma=%.3fs fps=%.2f±%.2f\n", n, mean, sd, 1440/mean, 1440*sd/(mean*mean)
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}
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}' $log | tee -a $log
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done
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echo "=== done $(date -Iseconds) ==="
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