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

[Henk D. Schoneveld]

On 30 Oct 2013, at 14:47, Paul B Mahol <onemda at gmail.com> wrote:

> 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.
Sorry to be confusing, but I don’t know of ANY option to change the framerate without reencoding.
BTW libx264 was mentioned as an example. 
> 
>> 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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>> 
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