On Fri, 20 Feb 2009, Stas Oskin wrote:

> To better clarify it, as the above explanation seems a bit confusing for
> myself :) :
>
> * I have a large GOP - of say 150
> * Have a frame rate of 10
> * I force a keyframe arbitrary in middle of GOP - and start writing a new
> file with this keyframe
> * When I open the file in VLC - it shows a black screen for 7-10 seconds,
> and then begins the playback, apparently by picking the next GOP keyframe
> * The VLC *doesn't* complain that first packet is not a key-frame - meaning
> the frame *does* marked as one

Sounds like the player is maybe looking for a sequence header? Depends on 
the codec used I suppose. Why not just close the codec and re-open it for 
the new file - that will definitely start with all the required headers 
before the first frame?
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