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Fri Jan 5 19:13:40 CET 2007 · https://ffmpeg.org/pipermail/ffmpeg-devel/2007-January/027062.html

Hi,
> Hi,
>
>>* Is it possible to extract frame uncontinuos ( one each ten for example
>> )
> *>* from an avi and save it in jpg?
> *>* At the moment I'm only able to extract all the frame from a time to
> *>* another.
> *
>> Yes, if you input AVI is 25fps and you want one of each ten frames
>> then use as output rate 25/10
>
>> $ ffmpeg -i small.avi -r 25/10 -f image2 out%03d.jpg
>
>> The result is not exact, there will be maybe a few frames more.
>
>> Regards,
>> V?ctor
>
> I've tried
> ffmpeg -i small.avi -r 25/10 -f image2 out%03d.jpg
> now I get picture size invalid (0x0)
> Segmentation fault
>
> The extraction I talked about (all the frame) was done in this way:
> ffmpeg -i small.avi out%03d.jpg
>
> without -f image2, but in this it seems to ignore if I add the tag -r
> 25/10
>
> with -f image2 if I add the tag -r 25/10 ffmpeg says me 2.5 fps so it
> seems to work
> but then I get the error picture size invalid

Please copy and paste exact command tried plus complete output messages,
(there is a guide on this at http://ffmpeg.mplayerhq.hu/bugreports.html)
otherwise is hard to diagnose your problem.

Regards,
V?ctor

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[Ffmpeg-devel] frame extraction