On 12/05/2019 19.25, Gyan wrote:
On 12-05-2019 10:43 PM, Thomas Seilund wrote:
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?
Not at present. The file protocol will buffer up to 256 kB and then
write out. There is an option to write immediately but it isn't
applied to the metadata filter as its I/O context is isolated. I plan
to patch that soon-ish.
Gyan
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Thanks Gyan.
Is there another way to get the metadata, ie. lavfi.scene_score, as the
frame is processed?
Basically, I want to take some action when there is motion in the video!
Thanks Thomas S
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