[FFmpeg-user] Creating video from every i'th picture
barsnick at gmx.net
Thu Jul 30 11:24:23 CEST 2015
On Thu, Jul 30, 2015 at 10:41:39 +0200, anders70 wrote:
> Is there a way to tell ffmpeg to only use every i'th picture in a
> specific list or to tell ffmpeg to only use pictures which number is a
> multiple of "i"?
Not as a demuxer option. If you're converting/encoding anyway (i.e. not
using "-c:v copy"), you can use the select filter:
$ ffmpeg [...] -vf "select=not(mod(n\,3))" [...]
will pass every 3rd frame to the encoder.
If you need to do it at the demuxer, I recommend a little script which
creates a temporary directory (using mktemp) and (symbolically) links
the input files of interest into a continuously numbered sequence. Then
let ffmpeg operate on those links.
(I was going to add a remark about Unix vs. Windows, but I think
Windows does have symbolic links in recent versions, and PowerShell
should be able to do such scripting easily. I myself could only do it
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