Such an easy question

[James Linder]

> On 24 Jul 2021, at 2:21 pm, Nirbheek Chauhan via gstreamer-devel <gstreamer-devel at lists.freedesktop.org> wrote:
> 
> Hi James,
> 
> It looks like you forgot to add a space after `false` and before the
> `!`, which is why setting the property failed, as the error message
> tells you.
> 
> Cheers,
> Nirbheek
> 
> On Sat, Jul 24, 2021 at 11:30 AM James Linder via gstreamer-devel
> <gstreamer-devel at lists.freedesktop.org> wrote:
>> 
>> 
>> 
>>> 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!”

Thanks for the help, provide-clock=false definitly made a difference doubling the record time. ie 8 sec to 20 sec.
During my fool-about I managed to select a silent source and recorded, silently, for 10 min.
I suspect the answer is in reach, I just cannot see it.

BTW

>>> you need to use "gst-launch-1.0 -e" to ensure that EOS is sent on
>>> Ctrl+C.

$@ means $ gst.launch -e -v
means gstreamer inherits the flags

James