[FFmpeg-user] Trying to get the last frame from a live FLV stream

[Andrey Utkin]

2013/9/2 Eugene M <floyd311 at gmail.com>:
> Hi everyone
>
> I'm trying to get a single frame from given live stream:
>
> ffmpeg -i
> http://brightcove03-f.akamaihd.net/valgbodmandag1378107345_1_300k@80362-vframes
> 1 -y frame.jpg
>
> What I expect here is the very last frame from the stream. But when I run
> ffmpeg with this options repeatedly several times per second I receive the
> same frame which changes (roughly) every 10 seconds.
>
> The stream itself plays smoothly and I can save it as an animated GIF or as
> a sequence of separate frames (when using something like frame_%09d.jpg).
> In that case there are no any lagging frames.
>
> I suppose that the "lagging frame" is some kind os keyframe or something
> like that. By the way, there is a line in program
> output<http://pastebin.com/YHBcsAr7>that says "[flv @
> 00000000027da340] Stream discovered after head already
> parsed". Is it connected somehow with my problem?
>
> I'm doing this because I need separate frames saved as still(!) GIFs, so I
> am running ffmpeg reepatedly as described above.
>
> Any ideas on how I can receive really the last up-to-date frame from a live
> stream?

Try something like
ffmpeg -i http://blah -filter:v fps=fps=0.1 -vcodec gif -f image2
-update 1 last.gif
It will rewrite last.gif file with the frame from input stream, once
each 10 seconds (i.e. at 0.1 fps rate).

-- 
Andrey Utkin