[Ffmpeg-devel] Patch: speed conversion

Rich Felker dalias
Sat Jul 23 02:30:00 CEST 2005

On Fri, Jul 22, 2005 at 07:52:29PM +0100, Jules wrote:
> The attached patch adds a command line option to 'ffmpeg' that allows 
> you to alter the playback speed of a video.  E.g.:
> ffmpeg -i input -spc 2:1 output  
>    (produces a video that is the input slowed down by a factor of 2)
> ffmpeg -i input -spc 23976:25000 -r 25 output
>    (converts an NTSC-film input to a PAL output, speeding up
>     playback by about 4%)

Incorrect ratio! The correct one is 24000:25025.


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