[FFmpeg-user] Issue Overlaying Video from x11grab and video4linux2

Ian Milligan ianmllgn at gmail.com
Tue Dec 3 02:05:36 CET 2013

The video is being encoded in real time so the fps at which it is encoding
matching the fps at which it receives video. The resulting video does not
playback correctly as well in the overlay example but does in the first

On Mon, Dec 2, 2013 at 4:58 PM, Johnny Klonaris <jawknee at sonic.net> wrote:

> Newbie alert - I'm new to ffmpeg and very new to the list…
> On Dec 2, 2013, at 4:26 PM, Ian Milligan wrote:
> > ...
> > output looks like: http://pastie.org/8524085. However when I try to
> capture
> > simultaneously using video4linux2 and overlay the two streams, the
> encoder
> > reports getting only about 5 fps. Here is some sample output:
> > http://pastie.org/8524055.
> The links above show text that appears to be cut off with no scroll bar and
> the output largely appeared on one line, but I eventually figured it out.
> In each of these, the fps output I see I believe is the rate
> at which frames are being encoded.   In other words - how fast
> ffmpeg is able do the the encoding as opposed to the ultimate playback
> rate.
> Hope that helps.
> Johnny
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