[FFmpeg-user] live stream - get data from multimedia filter continuously

[Thomas Seilund]

Hi All

I capture video stream from webcam and show video on screen.

The same stream goes through the 'metadata' multimedia filter as shown 
below:

ffmpeg -y -f v4l2 -input_format mjpeg -s hd480 -r 30 -i /dev/video2 
-filter_complex 
"[0:0]select='gte(scene,0)',metadata=print:file='movement.txt',null[X]" 
-map '[X]' -pix_fmt yuv420p -f xv Title

The text file 'movement.txt' gets information about each frame. BUT data 
is written to text file 'movement.txt' buffered. Is there any way to 
write data to text file 'movement.txt' as each frame is processed?

Thanks

Thomas S