[FFmpeg-devel] Second try, (sponsored) feature request

[Edit B]

Still no takers on this one?

Bouke


----- Original Message ----- 
From: "Edit B" <bouke at editb.nl>
To: <ffmpeg-devel at ffmpeg.org>
Sent: Thursday, July 03, 2014 10:56 AM
Subject: [FFmpeg-devel] (sponsored) feature request


> Hi all,
> Feature request / want to hire a coder, and IMHO a not so difficult.
> (Well, the devil will be in the detail's of course / famous last words...)
>
> I would like to have proper timecode on capturing live streams.
> Now, the way it is currently, i can start the recording with a timecode 
> value, but there is no fixed relation between the moment FFmpeg is fired 
> and the first frame is captured, so there is always an unpredictable 
> offset.
>
> What I think 'could' work is adding something that will hold FFmpeg at the 
> point just before it starts buffering. (So start up FFmeg with '-timecode 
> hold_horses' or whatever)
> Then, ask for a timecode value input.
> On receiving it, start filling the buffer and encode. (Taking the time 
> between that an initializing the buffer into account, if needed.)
>
> That 'should' result in a +/- one frame accurace, as the start time could 
> be just after the beginning of a frame coming in, or very close to the end 
> of one, so there can be an offset of slightly less than one frame 
> duration.
> No idea how to cope with that at the moment. Perhaps I could fire the 
> values at a fixed time intervals of N*frameDur so the offset would always 
> be the same. (All sources may be genlocked.)
>
> Instead of taking the timecode from the user, it could also use the system 
> time. My main concern is that I get multiple recordings starting at 
> different moments in sync.
>
> Does this make sense?
> Doable?
>
> thx,
>
> Bouke
>
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