Am 14.06.2022 um 15:33 schrieb Cecil Westerhof via ffmpeg-user:
Michael Koch <astroelectro...@t-online.de> writes:
Am 14.06.2022 um 13:47 schrieb Cecil Westerhof via ffmpeg-user:
Sometimes I have to cut parts out of a video. I now use for this (bash on
Debian):
ffmpeg -y \
-ss ${videoStart} -to ${cutStart} -i ${inputFile} \
-ss ${cutEnd} -to ${videoEnd} -i ${inputFile} \
-vcodec libx264 \
-crf 26 \
-acodec libmp3lame -qscale:a 9 \
-preset veryfast \
-lavfi "concat=n=2:v=1:a=1" \
-an ${outputFile}
But the cut from one part to another is a bit abrupt. Is there a
possibility to smooth it with something like a fade?
you can use the xfade filter. :
https://www.ffmpeg.org/ffmpeg-all.html#xfade
https://trac.ffmpeg.org/wiki/Xfade
I am now using:
offset=$((${cutStart} - ${videoStart} - ${duration}))
xfade=xfade=transition=slideleft:duration=${duration}:offset=${offset}
time ffmpeg -y \
-ss ${videoStart} -to ${cutStart} -i ${inputFile} \
-ss ${cutEnd} -to ${videoEnd} -i ${inputFile} \
-vcodec libx264 \
-crf 26 \
-acodec libmp3lame -qscale:a 9 \
-preset veryfast \
-filter_complex ${xfade} \
${outputFile}
But I have a major and minor problem.
The major problem is that I do not have audio from the second part of
the video.
Audio has its own filter: acrossfade
The minor problem is that I have to calculate the offset. It would be
nice if I could use -duration, but that does not work sadly.
As far as I know this isn't yet implemented.
By the way: how should I do it when I want to use five parts of the video?
I haven't tested this, but I think you must build a binary tree:
[0:v][1:v]xfade[a];[2:v][3:v]xfade[b];[a][b]xfade
Michael
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