[FFmpeg-user] Pipe to ffplay when recording: syntax

[MrNice]

Hi,

When I run the command

./ffmpeg -debug 1 -f pulse -ar 44100 -ac 2 -channel_layout stereo
-thread_queue_size 1024 -i alsa_input.pci-0000_00_14.2.analog-stereo -f
v4l2 -use_wallclock_as_timestamps 1 -itsoffset 1.70 -channel 1
-video_size 720x576 -pix_fmt yuyv422 -thread_queue_size 1024 -i
/dev/video0 -c:a pcm_s16le -channel_layout stereo -c:v ffv1 -level 3 -g
1 -aspect 4:3 -pix_fmt yuv422p -top 0 -vsync passthrough
/Store3/Test/t_`date +%Y%m%d_%H%M`.mkv

I have a perfect output without any error but I don't have preview.
When I add

-aspect 4:3 -f sdl "Dazzle output"
at any position I get the well known RED error message

Application provided invalid, non monotonically increasing dts to muxer
in stream 0:

I know it's very difficult to get ride of this error, so there could be
a workaround: pipe the output file to ffplay.

Unfortunately I can't find the syntax when the output is a file but only
when this is a raw video stream.
Could you help me for that?

Many thanks