Record webcam and keep audio-video sync

[Aviv Hurvitz]

I'm using Gstreamer to record audio+video from a webcam to a file, and
their sync is
off. I can see a delay in playback from the MKV file.

Note: It's important that I don't lose any frames over time from audio or
video.

Can someone see a problem with my command?

C:\gstreamer\1.0\msvc_x86_64\bin\gst-launch-1.0 -m -e -v
mfvideosrc device-name="Logitech MeetUp"  do-timestamp=true
! "image/jpeg," "width=3840," "height=2160," "framerate=30/1,"
"pixel-aspect-ratio=1/1"
! queue ! nvjpegdec ! queue ! nvh264enc preset=hp qp-min=23 ! queue !
h264parse ! queue ! mkv.

wasapisrc device="{audio_device_stringified}"
! queue max-size-buffers=0 max-size-time=0 max-size-bytes=0 ! mkv.

matroskamux name=mkv
! queue max-size-buffers=0 max-size-time=0 max-size-bytes=0 ! filesink
location=out.mkv
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