[FFmpeg-user] Unable to encode web with frame rates <1 fps

Johnny Klonaris jawknee at sonic.net
Sun Dec 22 03:07:55 CET 2013

Found the problem…

On Nov 23, 2013, at 3:01 PM, Johnny Klonaris wrote:

> Hi all…
> I'm trying to create videos with small fps values in both mp4 (libx264) and webm (libvpx)
> formats.   I"m OK down to 1 fps, but anything less only works with libx264  - if I try to use libvpx, 
> I get an error:
> Error while opening encoder for output stream #0:0 - maybe incorrect parameters such as bit_rate,
> rate, width or height

This is not an ffmpeg problem (if I'd been more thorough I'd have seen that).   It is a bug in libvpx - noted here:



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