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I'm trying to create some video previews consisting of 10x1s clips. My challenge though is to skip the first few seconds of the input files as they normally are all black without any content.
Current command:
ffmpeg -y -i inputfile.mp4 -filter_complex "[0:v]select='lt(mod(t,${duration}/10),1)',setpts=N/(FRAME_RATE*TB),scale=320:-2" -an outputfile.mp4
So, any suggestions on how I can skip the first few second?
FFMpegUser
Posted 2019-07-08T23:19:21.813
Reputation: 1
1
Just looking at the man page for ffmpeg here, you can use plenty of options to achieve the desired result.
-ss and -timestamp would probably work best.
So the command you're looking for is as follows:
ffmpeg -y -i inputfile.mp4 -ss 00:00:10 -filter_complex "[0:v]select='lt(mod(t,${duration}/10),1)',setpts=N/(FRAME_RATE*TB),scale=320:-2" -an outputfile.mp4
Note the format after the -ss option.
aa2397
Posted 2019-07-08T23:19:21.813
Reputation: 74
I've already tried -ss. (i.e. -ss 10) This causes the encoding to produce zero output. I do not see how -timestamp contributes to solving the problem. – FFMpegUser – 2019-07-09T00:35:33.190
@FFMpegUser If you've already tried that, please modify your question and include the full, uncut command line output. – slhck – 2019-07-09T14:42:52.367
@FFMpegUser Check the format required for the ss option – aa2397 – 2019-07-09T16:21:36.647
@aa2397 Actual man page is at https://ffmpeg.org/ffmpeg.html and see https://ffmpeg.org/documentation.html for more.
– llogan – 2019-07-09T17:04:20.880
Basic form is
ffmpeg -ss 12 -t 10 -i in.mp4 -vf "scale=320:-2" -an out.mp4which starts from 12 seconds into the file and extracts 10 seconds. – Gyan – 2019-07-09T04:47:09.997