Noted with thanks jdow.
On Sun, 22 Sep 2019 at 06:19, jdow <j...@earthlink.net> wrote:
>
> On 20190921 08:50:20, stan via users wrote:
> > On Sat, 21 Sep 2019 13:59:23 +0800
> > Turritopsis Dohrnii Teo En Ming <teo.en.ming.smartph...@gmail.com>
> > wrote:
> >
> >> What I mean is combining multiple smaller 4K video clips into a
> >> bigger, single 4K video and at the same time, allowing me to add
> >> layers of watermarks into the 4K video.
> >
> > Disclaimer: haven't done this, not an expert
> >
> > If you are concatenating several segments of 4k video, that should be
> > fast because there is no encoding or decoding. It would be best to do
> > this as a separate step, creating the final concatenated video as an output.
> > untested ffmpeg command to concatenate all the files
> >
> > ffmpeg -i [list of input files] -codec copy [concatenated output file]
> >
> > yields a single file of a name you choose containing all the input files
> > in the order you list them
> >
> > Adding the watermark is the piece that takes so long, because the
> > video has to be decoded, every frame filtered to add the watermark, and
> > re-encoded before writing to the output.
>
> FWIW I was playing mpeg/mjpeg/avi for watermark and video, two channels, and
> cross fading or cross squeezing with live video for branding and news room
> work
> back around 2005 live for HD with Matrox DSX cards on Windows. Back then the
> Matrox people were unable to make nearly enough performance out of their cards
> with Linux so they abandoned the effort. That may have changed, especially
> with
> Windows 10 putting itself in the way of clean honest video work at every step
> of
> the way. So this is just a benchmark of what WAS possible. nVidia based
> systems
> were doing approximately as well back then. In calculating what you want to do
> and how to do it be sure to calculate bus usage into the picture. With all the
> program I had authored was doing bus transfers became an issue as did, it
> turns
> out, the bus transfers between CPU chips in a multiple CPU system. Everything
> you can think of needs to be figured out with simple arithmetic to make sure
> you
> are not demanding more out of your system than it can deliver. It's not just a
> software issue. It's GPU cycles, CPU cycles, OS overhead, bus speeds, CPU to
> CPU
> bus speeds, and probably other more exotic issues such as page sizes that
> matter.
>
> Apple and Windows are the places with the really good software for this last I
> knew, which is some time ago. I'm retired now. Linux at the time was extremely
> anemic in comparison. You MAY have to embrace one of the devils.
>
> {o.o}
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