Pausing/resuming a video recording

[Luis de Bethencourt]

Hi Lee,

I don't think you can have multiple pipeline clocks. What you want is to
run something similar to the "running time" clock, but just for your
recording.

running-time = absolute-time - base-time

http://gstreamer.freedesktop.org/data/doc/gstreamer/head/manual/html/chapter-clocks.html
http://gstreamer.freedesktop.org/data/doc/gstreamer/head/gstreamer/html/GstPipeline.html#gst-pipeline-set-clock


On 11 July 2014 04:45, Lee Matthews <lma at spaceapplications.com> wrote:

> Thanks Luis.
>
> Do you know if it is possible for a branch (ie after a tee) to have its
> own clock separate from the pipeline clock ?
>
> Thanks
> Lee
>
> ----- Original Message -----
> From: "Luis de Bethencourt" <luis at debethencourt.com>
> To: "Discussion of the development of and with GStreamer" <
> gstreamer-devel at lists.freedesktop.org>
> Sent: Friday, 4 July, 2014 6:00:06 PM
> Subject: Re: Pausing/resuming a video recording
>
>
>
> I have never tried something similar to this. But I can imagine you are
> having timestamp related problems.
>
>
> When you resume recording, the timestamp of those frames is the real time
> and doesn't account for the (let's call it) "running recording time". You
> are going to have to manipulate these so they follow continuously.
>
>
> Luis
>
>
>
> On 3 July 2014 05:42, Lee Matthews < lma at spaceapplications.com > wrote:
>
>
> Hi,
>
> I'm streaming video using the vp8 codec in a webm container. I can record
> the video also by using a tee and piping the video to a filesink.
>
> To start/stop recording, I dynamically add/remove a group of elements to a
> tee in the pipeline.
>
> I also wish to be able to pause/resume the recording. I do this using
> output-selector to select between filesink and fakesink, the pipeline
> remaining in the PLAYING state. So when recording normally the video goes
> to filesink, during a pause it goes to fakesink, and on resume it goes back
> to filesink.
>
> My pipeline looks like the following :
>
>
> v4l2sec -- caps filter -- videoconvert -- vp8enc -- webmmux -- tee --
> queue -- multisocketsink
> |
> |-----queue -- output-selector -- filesink
> |
> |--------- fakesink
>
>
> If I record a video and say pause the video at 10 seconds, resume the
> video at 20 seconds and stop the video at 30 seconds. When playing back all
> is ok until 10 seconds, then the frame freezes until 20 seconds, at which
> point the video continues ok to 30 seconds.
>
> Does anyone know how to resolve this ?
>
> Thanks
> Lee
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