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

Nick Haddad nhaddad at mathworks.com
Wed Feb 20 15:53:38 CET 2008

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.


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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