I think I mixed up a few things. It looks like expr: is only valid for option force_key_frames. That is the original option I had troubles with. Just to make a simple example, I have used it for the frame rate as well. But now I do understand that "expr:" must not be used for the frame rate. If I simply specify max(25,30) it is working!
But still my option force_key_frames is not working. From the ffmpeg manual I use: -force_key_frames expr:gte(t,n_forced*5) It gives me the following error: Invalid duration specification for force_key_frames: expr:gte(t,n_forced*5) On Linux I use quotes around expr:gte(t,n_forced*5) or put backslashes in front of the round brackets otherwise bash starts to complain. So, it seems to be related to option force_key_frames only. 2015-09-03 12:46 GMT+02:00 Frans Gouverne <frans...@gmail.com>: > 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 <barsn...@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 >> _______________________________________________ >> ffmpeg-user mailing list >> ffmpeg-user@ffmpeg.org >> http://ffmpeg.org/mailman/listinfo/ffmpeg-user >> > > > > -- > Gouverne Web Design > Colenso 125 > 3761GL Soest > Tel: 035-6015569 > Mobiel: 06-11408032 > KvK: 32108255 > > -- Gouverne Web Design Colenso 125 3761GL Soest Tel: 035-6015569 Mobiel: 06-11408032 KvK: 32108255 _______________________________________________ ffmpeg-user mailing list ffmpeg-user@ffmpeg.org http://ffmpeg.org/mailman/listinfo/ffmpeg-user
