ffmpeg capture command error about pyca HOT 2 CLOSED

The ffmpeg output looks a bit odd. Can you give me the full ffmpeg command you are using?
On the Raspberry, we are usually using raspivid to capture the raw video stream and sox (or ffmpeg, or libav or arecord) to capture the audio separately.

from pyca.

We are using your same command which in pyca/config.py

CAPTURE_COMMAND = '''ffmpeg -re -f lavfi -r 25 -i testsrc -t %(time)s -map 0:v %(recdir)s/%(recname)s.mp4 -t %(time)s -map 0:v -filter:v select='not(mod(n\,50))' -updatefirst 1 %(previewdir)s/preview.jpg'''

As your guide now we using the below command and video started to record.

CAPTURE_COMMAND = '''raspivid -n -t %(time)s000 -b 4000000 -fps 30 -o - | \
   ffmpeg -r 30 -i pipe:0 -c:v copy %(recdir)s/%(recname)s.mp4'''

Thanks

from pyca.