Changing source without stopping pipeline

[Stefan Sauer]

On 11/01/2011 01:19 AM, superlou wrote:
>> You might want to use "videotestsrc ! capsfilter" and set the format 
>> that you use on v4l2src to videotestsrc. 
> I had actually over simplified my pipeline down too much.  The actual
> pipeline is a bit more complex (http://imgur.com/a/JreEy) with the before
> image being the working output of mixing the v4l2src with a videotestsrc and
> the after showing the result of swapping in the second videotestsrc
> (swapping in the bottom left of both images).  I also am swapping the
> ffmpegcolorspace since I heard there might be a bug with it renegotiating
> caps, but that might be a red herring.
>
> As shown in the after, I had been forgetting to set the new videotestsrc and
> ffmpegcolorspace playing.  Making sure to set both to playing, I see that
> the two new elements seem to negotiate ok (http://imgur.com/thSlt).  This
> leads to video that updates every few seconds or so.  I notice I get alot of
> this warning:
>
> 0:00:19.731523367 17149 0x7fcc00002290 WARN             videomixer2
> videomixer2.c:706:gst_videomixer2_fill_queues:<videomixer22:sink_0> Buffer
> from the past, dropping

Set is-live=true on videotestsrc.

> I'm also seeing a lot of Quality of Service messages:
> Source: ffmpegcsp3, Type: 16777216

Where does this message come from, try to print it with correct details
(Type: 16777216is not helpful).
> Do I need to do something to sync the timestamps on the new source?

Normally you would need to seek on the new source, but not for live-srcs.

Stefan
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