Such an easy question

[James Linder]

> On 23 Jul 2021, at 9:08 pm, Nirbheek Chauhan <nirbheek.chauhan at gmail.com> wrote:
> 
> Hi James,
> 
> I tested this pipeline on my system with a Logitech C920, and I was
> able to record 40 seconds of audio + video without issues. Note that
> you need to use "gst-launch-1.0 -e" to ensure that EOS is sent on
> Ctrl+C. This is the full command-line I used:
> 
> gst-launch-1.0 -e v4l2src device=/dev/video2 ! queue !
> video/x-h264,width=1920,height=1080,framerate=30/1 ! h264parse ! queue
> ! mux. pulsesrc ! audioconvert ! queue ! avenc_aac ! queue ! mux.
> mpegtsmux name=mux ! filesink location='output.ts'
> 
> The audio dropouts might be an issue with the selected clock, so maybe
> try "pulsesrc provide-clock=false" which will use the system clock.
> Another possibility is that your webcam is not actually outputting
> frames fast enough. This often happens in low light conditions.
> 
> You might also like to see the "min-upstream-latency" and "latency"
> properties on mpegtsmux, in case your devices have a startup delay.
> 
> Cheers,
> Nirbheek
> 
> On Fri, Jul 23, 2021 at 12:15 PM James Linder via gstreamer-devel
> <gstreamer-devel at lists.freedesktop.org> wrote:
>> 
>> My question is so simple that I cannot believe there is no answer
>> 
>> I have a camera providing 1080 at 30Hz in h254
>> I want to record the output together with pulse audio.
>> 
>> Google is fulll of tales of woe: eg
>> 
>> http://gstreamer-devel.966125.n4.nabble.com/How-do-you-record-audio-and-video-off-a-webcam-td4687419.html
>> 
>> Trying his ‘it works’ scenario found it does not work is even worse than mp4:
>> 
>> 
>> Mine: audio cuts out in 15 sec
>> 
>> gst-launch-1.0 $@ v4l2src device=/dev/video2 ! queue ! video/x-h264,width=1920,height=1080,framerate=30/1 ! h264parse ! queue max-size-buffers=0 max-size-bytes=0 max-size-time=1000000000 ! mux. pulsesrc device=0 ! audioconvert ! queue ! avenc_aac ! queue ! mux. mpegtsmux name=mux ! filesink location='output.mp4'
>> 
>> His: audio cust out in 1 sec
>> 
>> gst-launch-1.0 $@ v4l2src device=/dev/video2 ! queue ! video/x-h264,width=1920,height=1080,framerate=30/1 ! h264parse ! queue max-size-buffers=0 max-size-bytes=0 max-size-time=1000000000 ! \
>> mux.  pulsesrc device=alsa_input.usb-Sensoray_Co.__Inc._Sensoray_Model_2263_551645-04.analog-stereo ! audioconvert ! vorbisenc ! matroskamux name=mux ! filesink location=‘output.mkv'
>> 
>> Can anyone help?

I guess it is time to walk away, licking my wounds.
Thanks for the help.
I posted my results here: http://tigger.ws/downloads/output.ts

What may be intersting/relevant:
I am using an i3 nuc. HTOP shows 4 cores (actually 2 + 2 threads) at 2-5% busy.
I can record audio or video endlessly without any issue, just not together.
I cannot see a reference to provide-clock=false and indeed

WARNING: erroneous pipeline: could not set property "provide-clock" in element "pulsesrc0" to "false!”

Cheers
James