How to add a Pause option to the pipeline used for recording?

[sina_sh]

Hi,

I'm using the pipeline below to record two streams (in sync) one from the
webcam and the other, from a framegrabber beside two audio streams into two
separate container:




gst-launch-1.0 v4l2src device=/dev/video0 ! videorate !
'video/x-raw,framerate=24/1' ! videoconvert ! x264enc speed-preset=ultrafast
tune=zerolatency  ! queue max-size-bytes=0 max-size-buffers=0
max-size-time=0 ! mux2. pulsesrc
device="alsa_input.usb-Samson_Technologies_Samson_Go_Mic_Direct-00-Direct.analog-stereo" 
!  'audio/x-raw,rate=44100,channels=1' ! queue max-size-bytes=0
max-size-buffers=0 max-size-time=0 !  vorbisenc ! matroskamux name=mux2 !
filesink location=/home/sina/Desktop/Recordings/Screen v4l2src
device=/dev/video1 ! 'image/jpeg,width=1920,height=1080,framerate=30/1' !
queue max-size-bytes=0 max-size-buffers=0 max-size-time=0 !  mux.  pulsesrc 
device="alsa_input.usb-046d_Logitech_Webcam_C930e_AAF8A63E-02-C930e.analog-stereo"
! 'audio/x-raw,channels=1,rate=44100' ! queue max-size-bytes=0
max-size-buffers=0 max-size-time=0 ! audioconvert ! queue max-size-bytes=0
max-size-buffers=0 max-size-time=0 ! avenc_aac compliance=experimental !
queue max-size-bytes=0 max-size-buffers=0 max-size-time=0 ! matroskamux
name=mux mux. ! filesink location=/home/sina/Desktop/Recordings/Webcam




(Let me also add this: I use ffmpeg afterwards to convert the recorded files
into my desired containers:

ffmpeg -i ~/Desktop/Recordings/Screen -vcodec copy -acodec copy
~/Desktop/Recordings/Screen_Con.mp4

ffmpeg -i ~/Desktop/Recordings/Webcam -vcodec copy -acodec copy
~/Desktop/Recordings/Webcam_Con.mkv)



This pipeline works perfectly fine for recording. I have two options on my
UI (a simple web interface developed via flask in python) one, to execute
this script and following start the recording and the second one to kill the
recording process to stop it. here is the stop script, I'm using:


    kill -9 $(pidof gst-launch-1.0)

    kill -9 $(ps | grep "gst-launch-1.0" | grep -v grep | awk '{ print $1
}')


I'd like to add a pause option as well, to be able to pause the recording
process and continue the recording by concatenating the rest to the end of
the recorded files (a normal pause option like a typical handy-cam: A+B -->
AB at the end) but with this pipeline it seems, I don't have much of a
chance or better to say, I don't know how to change it to achieve this
functionality.

Can you please help me with that?

What shall I add? how shall I change it in order to get the pause option?

Thanks a lot in advance!



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