stabilisierung mit vid.stab-Plugin für ffmpeg (auch für melt)
problem: verwackelte handyvideos
http://public.hronopik.de/vid.stab/
parameterdoku: http://public.hronopik.de/vid.stab/features.php
ubuntu 16.04 + vid.stab:
- https://askubuntu.com/a/405557/15110
- https://launchpad.net/~mc3man/+archive/ubuntu/ffmpeg-test
beispiel: https://wiki.archlinux.org/index.php/FFmpeg#x264_video_stabilization
v1:
$ ffmpeg2 -i 20170912_081401.mp4 -vf vidstabdetect=shakiness=5:show=1 dummy.mp4
$ ffmpeg2 -i 20170912_081401.mp4 -vf vidstabtransform,unsharp=5:5:0.8:3:3:0.4 stabilized-output.mp4
-> war komisch, flackernd - bestimmt der unsharp-filter
v2: 5s mit Drehung
$ ffmpeg2 -ss 00:00:10 -t 00:00:20 -i 20170912_081401.mp4 -filter:v transpose=2:passthrough=landscape,vidstabdetect=shakiness=5:show=1 -y dummy.mp4
$ ffmpeg2 -ss 00:00:10 -t 00:00:05 -i 20170912_081401.mp4 -filter:v transpose=2:passthrough=landscape,vidstabtransform stabilized-output.v2.mp4
v3: 30s, drehung
$ ffmpeg2 -ss 00:00:10 -t 00:00:30 -i 20170912_081401.mp4 -filter:v transpose=2:passthrough=landscape,vidstabdetect=shakiness=5:show=1 -y dummy.mp4
v4: 30s, drehung, 20f smoothing
$ ffmpeg2 -ss 00:00:10 -t 00:00:30 -i 20170912_081401.mp4 -filter:v transpose=2:passthrough=landscape,vidstabtransform=smoothing=20 stabilized-output.v4.mp4
v5: shakiness=10 (statt std 5)
$ ffmpeg2 -ss 00:00:10 -t 00:00:30 -i 20170912_081401.mp4 -filter:v transpose=2:passthrough=landscape,vidstabdetect=shakiness=10:show=1 -y dummy.mp4
$ ffmpeg2 -ss 00:00:10 -t 00:00:30 -i 20170912_081401.mp4 -filter:v transpose=2:passthrough=landscape,vidstabtransform=smoothing=10 stabilized-output.v5.mp4
v6: resize 1280x720
$ ffmpeg2 -ss 00:00:10 -t 00:00:30 -i 20170912_081401.mp4 -filter:v transpose=2:passthrough=landscape,vidstabtransform=smoothing=10,scale=1280:-1 stabilized-output.v6.mp4
v6.1: keine dummydatei
$ ffmpeg2 -i dvd1/20170609_142905.mp4 -filter:v transpose=2:passthrough=landscape,vidstabdetect=shakiness=10:show=1 -f null -
$ ffmpeg2 -i dvd1/20170609_142905.mp4 -filter:v transpose=2:passthrough=landscape,vidstabtransform=smoothing=10,scale=1280:-1 dvd1/20170609_142905.stab.mp4
unsharp? ne, hilft nicht.
alle stabilisieren + drehen:
$ time for i in dvd?/2017*.mp4; do ffmpeg2 -i "$i" -filter:v transpose=2:passthrough=landscape,vidstabdetect=shakiness=10:show=1 -f null -; ffmpeg2 -i "$i" -filter:v transpose=2:passthrough=landscape,vidstabtransform=smoothing=10,scale=1280:-1 "stab-$i"; done
----
ffmpeg parameters:
-ss position - seek to (begin at)
-t duration - relative to -ss
-to position - absolute
man ffmpeg-filters
drehen:
$ ffmpeg -ss 00:00:10 -t 00:00:05 -i 20170912_081401.mp4 -filter:v transpose=2:passthrough=landscape rotated.mp4
