[FFmpeg-user] Need help with converting a h.264 3gp file to h.263 3gp

[Carl Eugen Hoyos]

Jim Worrall <coniophora <at> gmail.com> writes:

> >> Invalid pixel aspect ratio 1080/1661, limit is 255/255 reducing
> >> [aac @ 0xa7e3f20] Too many bits per frame requested
> > 
> > Looks like aac is complaining you're requesting too high of a bitrate.
> > 
> > Also, please refrain from top posting.
> 
> Also invalid pixel aspect ratio.

The message about pixel aspect ratio above is a warning 
(about a problem FFmpeg was able to fix itself), 
the aac message is an error (that stops encoding).
Either reduce the bitrate or consider using an external 
aac encoder library.

> Seems like h263 is a very finicky codec.

It is specified like this, if you want an extremely similar, 
less restrictive codec, use h263p.

Carl Eugen