[FFmpeg-user] custom video enhancements using ffmpeg

[Matt Bione]

Thanks for all the suggestions. What if I want to use a simple scene cut
detector as the above filter ? I see that there is a sc_threshold but I
think that is used in encoding the stream in general and deciding on when
to put I-frames in particular. Is there a way to say that I want all the
frames where the sc_threshold is crossed to be dumped into a jpg ?

Thanks
Matt

On Sat, Jul 28, 2012 at 7:21 PM, Lou <lou at lrcd.com> wrote:

> On Fri, Jul 27, 2012, at 09:11 PM, Matt Bione wrote:
> > Hi,
> >    I am looking to do the following :
> > Add some custom enhancement (using my own code using opencv or something
> > similar) to a video.
> >
> > I am looking at ffmpeg to produce raw frames which I can tweak and then
> > give back to the ffmpeg to transcode it back. Is there a way to do this
> > using the ffmpeg command line tools - maybe using pipes or creating
> > streams
> > ? I can think of a really inefficient way to do this - dump every frame
> > to
> > the disk using ffmpeg (e.g. , ffmpeg -i video.mpg image%d.jpg); read
> > those
> > files and apply my modifications to those images and finally call ffmpeg
> > to
> > produce a video using those frames(e.g. ffmpeg -f image2 -i image%d.jpg
> > video.mpg ). But hopefully there is a better way that someone can point
> > me
> > to ?
> >
> > Regards
> > Matt
>
> You can pipe from and to ffmpeg. Possibly overly simple example:
>
> ffmpeg -i input -f <output format> - | <your tool> | ffmpeg -i - output
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