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

[MrNice]

On 26/11/15 11:38, MrNice wrote:
> 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
> 

I was thinking the answer easy but maybe not.

I tried all combinations in this page but didn't succeed
http://superuser.com/questions/322216/how-can-i-pipe-output-of-ffmpeg-to-ffplay

-f rawvideo - | ffplay -f rawvideo -
pipe:1 | ffplay -i -
-f matroska - | ffplay -
pipe:play | ffplay -i pipe:play
and more

Is it so difficult to get it?