[FFmpeg-user] Invalid duration specification for force_key_frames

[Frans Gouverne]

Hi Moritz,

thanks for the reply.

Using -r for the frame rate is just a simple example to check if expr: is
working or not. By the way, it should be expr:, not exp: but that does not
change anything for my example or output.

When using max(), I still get:
Invalid framerate value: expr:max(25,30)

ffmpeg simply doesn't recognize any expr: on the command line!!

I got the same problem with version 2.6.3 from June 2015:
ffmpeg version N-36084-g993c84e-xuggle-5.5
built on Jun 11 2015 13:08:14 with gcc 4.4.7 20120313 (Red Hat 4.4.7-11)

The version that worked before was 1.2.1.

But maybe it has something to do with my compilation of ffmpeg? This is
what I used as config options:

./configure --enable-librtmp --enable-libx264 --enable-gpl




2015-09-03 10:54 GMT+02:00 Moritz Barsnick <barsnick at gmx.net>:

> Hi Frans,
>
> On Thu, Sep 03, 2015 at 10:36:32 +0200, Frans Gouverne wrote:
> > since I recompiled ffmpeg some months ago, I cannot use expressions on
> the
> > command line anymore, they are simply not recognized. For example:
> >
> > ffmpeg -re -i demo.mp4 -ac 2 -b:a 64k -ar 44100 -c:v libx264 -r
> > exp:gt(25,30) -f mp4 output.mp4
> >
> > Invalid framerate value: exp:gt(25,30)
>
> a) I can successfully use expressions for "-r" if I omit the "exp:"
>    part. (That may have changed over the months, I don't know.)
>
> b) gt(25,30) won't work with "-r", as "-r" doesn't accept "0"!
>    From the docs:
>    ‘gt(x, y)’
>        Return 1 if x is greater than y, 0 otherwise.
>    Are you looking for "max(25,30)"?
>
> >   built on Jan 19 2013 20:36:06 with gcc 4.7.2 (GCC)
>
> Did you say "some months ago"?? 32 months! How old was the ffmpeg you
> were using before?
>
> Moritz
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