[FFmpeg-user] Using the "select" filter

[Clément Bœsch]

On Thu, Nov 17, 2011 at 11:19:48AM +0000, Tim Nicholson wrote:
> The examples of using the select filter given at:-
> 
> http://ffmpeg.org/ffmpeg.html#select
> 
> suggest, for example,
> 
> # select only I-frames
> select='eq(pict_type\,I)'
> 
> 
> However when I tried this I got an error.
> 
> ffmpeg -i in.mp4 -vf "select='eq(pict_type\,I)', showinfo" -f mp4 -y
> /dev/null
> [..]
> Missing ')' or too many args in 'eq(pict_type\,I)'
> 
> 
> Removing the "\" which I assume is there to "escape" the comma
> solved the problem, thus:-
> 
> ffmpeg -i in.mp4 -vf "select='eq(pict_type,I)', showinfo" -f mp4 -y
> /dev/null
> 
> This looks like a small error in the docs.
> 

You are not supposed to add quotes around the select.

  ffmpeg -i in.mp4 -vf select='eq(pict_type,I)',showinfo -f ...

should work.

-- 
Clément B.
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