[FFmpeg-user] Overlay performance

[Darrin Smith]

Really appreciate the feedback.

One question though so I understand correctly.

It was suggested to use a cropped overlay. Does FFMpeg auto scale up then?

I need overlay content on all four corners of the video. What I did was
create on png that is the same size as the video source resolution. If I
crop everything out but the text I need, then FFMpeg, by default, will
stretch that to the corners of the video? I had not read that anywhere so I
was just wanting to make sure that I understood correctly.

Again, thank you for your help here.



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08/27/19,
11:46:35 AM

On Tue, Aug 27, 2019 at 11:21 AM Paul B Mahol <onemda at gmail.com> wrote:

> On Tue, Aug 27, 2019 at 6:17 PM Carl Zwanzig <cpz at tuunq.com> wrote:
>
> > On 8/27/2019 9:04 AM, Darrin Smith wrote:
> > > I did copy the command, but there is no way to get better hardware.
> This
> > is
> > > for an app where the user may have even lesser hardware (cell phones)
> > than
> > > what was used so I'm hoping to optimize it as much as possible.
> >
> > Try using a cropped overlay (not full size)- if most of the full-size
> > overlay is transparent, there's no point in processing that part, let
> > ffmpeg
> > ignore those pixels.
> >
> >
> Yea, that is sane approach.
>
>
> > Make sure the color spaces and formats are identical.
> >
> > Remove the math from the filter complex; do it in the outside script (but
> > the next will take care of this).
> >
> > Drop any filters/options that aren't actually necessary (i.e. rotate=0
> and
> > all the rotate options); if you're not rotating, don't include them at
> all.
> >
> > Consider using an uncompressed overlay (so it doesn't need to be
> decoded).
> >
> >
> > Basically, optimize all of the operations and remove redundant or
> > non-operational ones.
> >
> >
> > > Thank you for your feedback anything else you can think of?
> > Please stop top-posting on this list.
> >
> > Later,
> >
> > z!
> >
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