[FFmpeg-user] cannot seek into png 'video'

[Carl Eugen Hoyos]

Am Di., 1. Okt. 2019 um 16:48 Uhr schrieb Thorsten von Eicken
<tve at voneicken.com>:
>
> On 10/1/19 12:35 AM, Moritz Barsnick wrote:
> > Moin Thorsten,
> >
> > On Tue, Oct 01, 2019 at 00:56:33 +0000, Thorsten von Eicken wrote:
> >> I'm trying to put an overlay over a video and I'm having difficulties
> >> seeking into the png in order to time-shift the video and overlay
> >> relative to one another.
> > I don't really understand what you are trying to do, neither from this
> > sentence:
> >
> >> If I'd now like to skip the first 10 seconds of the overlay in order to
> >> line up the timing better I try to use:
> > "Line up timing" or "time shift" are nice terms, but all "-ss" does it
> > to shift the starting point of the input file to a certain point. E.g.
> > "-ss 10" skips the first 10 seconds.
>
> The png input is not a single static image, it is a sequence of images,
> i.e. a video in png format. Like mjpeg but png.

You cannot (in general) seek in such a stream.

Use files that can be accessed with %d instead, seeking works
with img2dec for multiple files.

Carl Eugen