[gst-devel] Deinterlaced video seeking

[Sebastian Dröge]

On Thu, 2010-04-22 at 18:54 +0400, Gregory Petrosyan wrote:
> 2010/4/22 Sebastian Dröge <sebastian.droege at collabora.co.uk>:
> > On Thu, 2010-04-22 at 16:20 +0200, Edward Hervey wrote:
> >> On Thu, 2010-04-22 at 17:33 +0400, Gregory Petrosyan wrote:
> >> > I am building an application that should be able to show interlaced 25
> >> > fps DV video as deinterlaced 50 fps one. I have no problem using
> >> > "deinterlace" component, and gst-inspect shows that source pad of it
> >> > gives me 50 fps video indeed.
> >> >
> >> > (Pipeline looks like "filesrc ! queue ! decodebin ! ffmpegcolorspace !
> >> > deinterlace ! ffmpegcolorspace ! autovideosink").
> >> >
> >> > As I understand, "seek" travels up the pipeline, until it reaches
> >> > "dvdec" or something like that, and it can only seek with 25-fps
> >> > accuracy, because it knows nothing about deinterlacing. What should I
> >> > do to be able to seek this video with 50-fps accuracy?
> >>
> >>   It should work with the GST_SEEK_FLAG_ACCURATE flag in your seek
> >> event, which will make your seek nano-second accurate.
> >>   The only problem is that I just checked deinterlace, and it doesn't
> >> properly drop buffers before that seek point, but the videosink will
> >> take that into account and properly display starting from the position
> >> you requested.
> >>
> >>   So, for displaying, the accuracy will work as expected, but for some
> >> other uses it might not.
> >
> > My local version of deinterlace clips the output to the configure
> > segment. I'll push this change after gst-plugins-good is open for commit
> > again.
> >
> > Then it will work for displaying and all other use cases.
> 
> Thanks! Should I use the latest git GStreamer with your patch applied,
> or are e.g. OSSBuild  and Ubuntu versions OK too? (OSSBuild has
> 0.10.28 -base and 0.10.21 -good, same for Ubuntu).

The patch will probably only work with the GIT version because it
depends on some other local changes, which I'll push to GIT before that.
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