[gst-devel] Smooth rewind with Gstreamer

[Daniel James Laird]

Thanks for that,
My second question is If I want key frame only rewind using qtdemux has anyone got that working?

I have tried gst_element_seek with a rate of -2.0 with a start point of the current stream location and an end point of 0

But this does not seem to work, any ideas?

Many thanks
Daniel Laird

-----Original Message-----
From: Julien Moutte [mailto:julien at moutte.net] 
Sent: 2009 Apr 21 17:27
To: Discussion of the development of GStreamer
Subject: Re: [gst-devel] Smooth rewind with Gstreamer



Hi,

Are you sure your video decoder supports reverse playback scenario ?

It will receive frames in decoding order, it should queue them
internally and push them in reverse order when it receives an incoming
buffer with the DISCONT flag.

Please also make sure you have a big queue behind the video decoder so
that it can take some advance compared to the rendering element.

Julien Moutte,
FLUENDO S.A.

Daniel James Laird wrote:
> All,
> 
> I am trying to get trickmodes working on my Gstreamer pipeline.
> 
> I can use gst_element_seek and get FF working i.e I can set rate to 1,2,4,8 etc and my MP4 file plays in FF.
> However when I put a negative number I do not get smooth RW behaviour from the qtdemux.  
> It seems reverse playback is supported by the component.  
> 
> Does anyone have this working and if so am I missing any steps out?  ANy help much appreciated.
> I can seek to a specific point and can seek to a point relative to my current position but just cant get rewind to work.
> 
> Hope you can help
> 
> With regards,
> Daniel Laird
> 
> 
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