Skip to content

Instantly share code, notes, and snippets.

@jpetazzo
Last active April 18, 2021 10:57
Show Gist options
  • Save jpetazzo/1e2348e4ee02d5a4d63eeda6ac7833cc to your computer and use it in GitHub Desktop.
Save jpetazzo/1e2348e4ee02d5a4d63eeda6ac7833cc to your computer and use it in GitHub Desktop.
#!/bin/sh
echo "codec args duration time_real time_user time_sys cpu_percent size_input size_output"
for F in *.log; do
. ./$F
echo "$CODEC $ARGS $duration $TIME_REAL $TIME_USER $TIME_SYS $CPU_PERCENT $SIZE_INPUT $SIZE_OUTPUT"
done
#!/bin/sh
# This needs a short video file (test.mp4), it will decode it to
# raw video (warning: this will use A LOT of disk space!) then
# it will try to encode it with a variety of codecs, to compare
# their speed, CPU usage, and overall efficiency.
# I wrote this script when I was trying to find out what would
# be a good "mezzanine codec" to transfer 1080p/30fps video over
# gigabit Ethernet as efficiently as possible, where "efficiency"
# here means: low CPU usage on the sending side and low latency.
# I ended up using HDMI out and an HDMI capture dongle (😅) but
# further testing seemed to show that H264 ultrafast/zerolatency
# could actually deliver even better results than the codecs I
# tested here. 🤷
init() {
ffmpeg -i test.mp4 -c:v rawvideo -c:a copy test.nut
}
test_codec() {
KEY=$(echo "$*" | sha256sum | cut -c1-8)
CODEC=$1
shift
ARGS="$@"
LOG=test-$KEY.log
OUT=test-$KEY.nut
[ -f $OUT ] && return
ffprobe -v error -show_entries format=duration -of default=noprint_wrappers=1 test.nut > $LOG
printf "CODEC=%s\nARGS=\"%s\"\n\n" "$CODEC" "$*" >> $LOG
pv -cN input test.nut \
| /bin/time -a -f "TIME_REAL=%e\nTIME_USER=%U\nTIME_SYS=%S\nCPU_PERCENT=%P\n" -o $LOG ffmpeg -i - -an -c:v $CODEC $ARGS -f nut - \
| pv -cN output > $OUT
stat test.nut --format "SIZE_INPUT=%s" >> $LOG
stat $OUT --format "SIZE_OUTPUT=%s" >> $LOG
echo
cat $LOG
}
test_codec ffv1
test_codec ffvhuff
test_codec prores
test_codec mjpeg
test_codec mjpeg -qscale:v 1
test_codec mjpeg -qscale:v 2
test_codec mpeg1video
test_codec mpeg1video -qscale:v 1
test_codec mpeg1video -qscale:v 2
test_codec mpeg2video
test_codec mpeg2video -qscale:v 1
test_codec mpeg2video -qscale:v 2
Sign up for free to join this conversation on GitHub. Already have an account? Sign in to comment