[FFmpeg-user] Increase video speed via framerate change?

[Paul B Mahol]

On 10/30/13, Henk D. Schoneveld <belcampo at zonnet.nl> wrote:
>
> On 30 Oct 2013, at 13:20, Richard llom <richard.llom at gmail.com> wrote:
>
>> Hello,
>> I have an video with 4 fps, I want to speed this up (time lapse), but also
>>
>> increase the framerate, so I thought:
>> ffmpeg -i input.ogv -r 12 output.webm
> You'll have to apply a little more thought to this. You have to encode, so
> tell ffmpeg which encoder library to use. ffmpeg -i file -c:v libx264
> chooses libx264 as encoder library. Further you have to tell ffmpeg what the
> input frame rate is AND what output framerate you want it to become. Search
> the web for examples.

This is simply wrong, please do not confuse users.
ogv files do not need any input frame rate option.

> Henk
>>
>> will do the trick, but no avail. Video is still the same length, how can I
>>
>> do this in ffmpeg?
>>
>> TIA
>> richard
>>
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