[gst-devel] How do get the number of frames in a video file?

[Wim Taymans]

On Thu, 2008-02-21 at 09:49 -0500, Nick Haddad wrote:
> Anyone else have ideas on how to best do this?

Go to PAUSED, wait for paused to happen by listening to the ASYNC_DONE
message or by polling or by doing a blocking gst_element_get_state().
Then you can get all the info.

Wim

> 
> Thanks,
> -Nick
> 
> On Feb 20, 2008, at 9:53 AM, Nick Haddad wrote:
> 
> > I really need to get this information before playback starts.  I want
> > to present the user with the frame count after they open a file.
> >
> > If there is no generalized way to do do this (by asking the decode
> > bin?) Is there a way seek through by frames without decoding the video
> > in the files?  If there is then I can do a quick walk through frame by
> > frame to do my count.
> >
> > Thanks,
> > -Nick
> >
> > On Feb 20, 2008, at 5:54 AM, Felipe Contreras wrote:
> >
> >> On Feb 19, 2008 11:48 PM, Nick Haddad <nhaddad at mathworks.com> wrote:
> >>> I want to retrieve the duration of a video file in frames, but can't
> >>> figure out the best way to do this.
> >>>
> >>> Calling...
> >>>
> >>> GstFormat fmt = GST_FORMAT_DEFAULT;
> >>> gst_element_query_duration( _pipeline, &fm, &numFrames)
> >>>
> >>> ...doesn't work.  I'm assuming because the pipeline doesn't know
> >>> about
> >>> the "default format" (GST_FORMAT_TIME works fine).
> >>>
> >>> Which element in my pipeline should I query for the number of video
> >>> frames?  Is this even possible.  Currently I am building a pipeline
> >>> using decodebin.
> >>
> >> Do you need it at any point in time or would it be OK at the end of
> >> the playback?
> >>
> >> -- 
> >> Felipe Contreras
> >
> >
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