Changing Frame Rate

[Sebastian Dröge]

On Do, 2016-06-23 at 20:03 -0700, ht techdev wrote:
> Hi
> Is there a way, within gst-launch, to change the frame rate on fly?
> Failing that is it possible to append to an existing encoded file,
> using a different rate:
>  
> gst-launch-1.0 videotestsrc is-live=true num-frame=10 !  video/x-raw, 
> framerate=\(fraction\)”30/1” ! \ ! x264enc ! filesink location=t.mp4
> gst-launch-1.0 videotestsrc is-live=true num-frame=10 !  video/x-raw, 
> framerate=\(fraction\)”50/1” ! \ ! x264enc ! filesink –append
> location=t.mp4

With gst-launch-1.0 you can't do it, with actual code you relatively
easily can (you "just" change the framerate).

Appending MP4 files is not easily possible, you would at least have to
remux them but for full correctness you would also have to reencode the
h264 stream as the avcC struct (the "header") is going to be different
for both encodings in your case and that's not really allowed by the
spec (there can only be one).

-- 

Sebastian Dröge, Centricular Ltd · http://www.centricular.com
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