FFmpeg any frame picture command from video

To intercept a picture of a 352x240 size, formatted as JPG:

The code is as follows	Copy Code
Ffmpeg-i test.asf-y-F image2-t 0.001-s 352x240 a.jpg

Convert the first 30 frames of the video into a animated Gif:

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Ffmpeg-i test.asf-vframes 30-y-F gif a.gif

After testing, I found this parameter:

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-ss Time_off Set the start time offset

Using the-SS parameter, you can start processing a transformation task from a specified time. such as:

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Ffmpeg-i test2.asf-y-F image2-ss 08.010-t 0.001-s 352x240 b.jpg

Then the problem of screenshots from any frame is solved. As long as the-ss time parameters are randomly generated, and in the video effective time, it can be.

The same effect can be achieved by specifying-SS, and-vframes.

At this point the-SS parameter is followed by two ways of writing, hh:mm:ss or direct write seconds:

code is as follows	copy code
Ffmpeg-i -f  image2 -ss 00:01:00-vframes 1  test1.jpg or ffmpeg-i test.asf-y-f  image2 test.asf-y  -SS 60-vframes 1  test1.jpg