[FFmpeg-user] specify duration in frames

[Sam Logan]

On 5/7/14, Elliott Balsley <elliottbalsley at gmail.com> wrote:
> Is there some way to specify a duration in frames?  Using the
> HH:MM:SS.xxx syntax seems imprecise.  It would be great to have an
> option for HH:MM:SS:FF.

The last I heard (about a year or so ago), in FFmpeg, there was no way
to seek to specific frames with either -ss or -t, nor any similar
options that would do so. The best you can do is to make your own
calculations based on framerate and timestamps and hoping that
rounding/precision errors don't ruin the results, and unfortunately,
much of the time rounding/precision errors will indeed ruin the
results and not get you the exact frames that you want.

I have no idea why this functionality does not exist, as it is such
basic and obvious functionality that it is one of the most glaring
omissions in FFmpeg, something that users have asked for for years
that the developers have never added to the best of my knowledge.