[gst-devel] Deinterlaced video seeking

[Sebastian Dröge]

On Fri, 2010-04-23 at 23:55 +0400, Gregory Petrosyan wrote:
> 2010/4/22 Sebastian Dröge <sebastian.droege at collabora.co.uk>:
> > 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.
> 
> Can you please post the patches here, or give me a link to your
> repository? It seems that I can't get proper seeking without them.

Patches are attached... it only supports seeking in TIME format though.

If you find any problems with that patchset please tell me.
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