[Ffmpeg-devel] Seeking on a live stream

[Andy Parkins]

Hello,

I'm using ffmpeg to record a live MPEG4 stream.  This is working well.  
However, when I try to play back the stream - with say ffplay - I can't seek 
properly.  The problem, I believe, is that the file is still open and so 
hasn't had whatever headers/trailers that are needed written to it yet.

My question then is what output format should I be using?  I'd like to be able 
to view the stream "live" but still seek backwards in time.  A bit like a 
TiVo or similar.

I've tried a few different formats and have also tried calling 
av_seek_frame_binary() but after a bit of investigation find that very few 
formats actually support av_seek_frame_binary() because they don't implement 
read_timestamp().  Oh dear.  I'm sure I can't be the only person in the world 
wanting to seek on a live stream - so I'm fairly convinced I'm missing 
something obvious; my apologies for my ignorance :-)

Thanks in advance



Andy

-- 
Dr Andrew Parkins, M Eng (hons), AMIEE

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