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I am using FFmpeg to extract screenshot from a video with the following command

/usr/bin/ffmpeg -ss 15 -y -i test.flv -vcodec mjpeg -vframes 1 -an -f rawvideo test.png

But the command fails. Last 3 lines of the response are

frame= 0 fps= 0 q=0.0 Lsize= 0kB time=00:00:00.00 bitrate= 0.0kbits/s video:0kB audio:0kB global headers:0kB muxing overhead -nan% Output file is empty, nothing was encoded (check -ss / -t / -frames parameters if used)

Note that command runs successfully for other video types (3gp, mp4).

Also, when I replace "-ss 15" option with "itsoffset 15" it runs successfully with flv files as well.

Does anybody know why -ss option doesn't work for .flv files?

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  • Complete ffmpeg console output is missing. Commented Jan 8, 2013 at 20:11
  • -ss option is working for me: ffmpeg -ss 5s -i input.flv -t 5s output.flv, skips 5 seconds and gives me 5 seconds output video. but my ffmpeg is actually avconv. Commented May 5, 2013 at 2:18

3 Answers 3

Reset to default
10

In newer versions of ffmpeg the -ss and -t options must go after -i [filename].

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2 Comments

But note that the position of -ss can be either before or after -i, they serve different purposes. Read here for more: trac.ffmpeg.org/wiki/Seeking
Worked in ffmpeg version 4.2.7-0ubuntu0.1 Copyright (c) 2000-2022 the FFmpeg developers
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It might be a syntax issue. The following should work just fine:

/usr/bin/ffmpeg -ss 15 -y -i test.flv -frames:v 1 -an test.png

Notice i removed the codec and the format parameters. I don't think it's wise to force mjpeg on a png continuer & flv is not a rawvideo format

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0

U need to set video format options (EX: -preset ultrafast -s 1366x768 -r 10 -b:v 555k -crf 45 -vcodec libx264 -threads 0 -pix_fmt yuv420p)

I had the same issue when was cutting part from video, -c:v copy simply gives mentioned warning and nothing happens.

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