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I use ffmpeg to capture screenshot from video. Here is the command code:
ffmpeg -i /my_video_file_dir/video.flv -y -f image2 -ss 8 -sameq -t 0.001
-s 320*240 /image_dir/screenshot.jpg
And I want to capture the screenshot at a fine time unit 8.344 for example
But it does not output screenshot image by the above command
In my test, -ss 1,1.5,2,2.5 ... works fine and others not such as 1.1,1.11
Does andbody know why it happens and how can I capture screenshot at a x.xxx time
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Getting the Duration To get the duration with ffprobe , add the -show_entries flag and set its value to format=duration . This tells ffprobe to only return the duration. To convert the above value into minutes and seconds, round it to an integer and divide it by 60.
The ffmpeg -timestamp option takes a date, which it stores in the output file. It is not related to the timecode and does not cause any text to be rendered.
Try this instead:
ffmpeg -ss 00:00:01.01 -i /my_video_file_dir/video.flv -y -f image2 \
-vcodec mjpeg -vframes 1 /image_dir/screenshot.jpg
Note that very small increments will not normally result in different images, due to lower frame rates of most videos. 0.001s increments only work with videos of 1000fps framerates :) 0.03 increments should work with a 30fps video, etc.
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