How can alternate buffers be dropped efficiently?

[jeyp4]

How can alternate buffers be dropped in efficient manner.
I have read and tried  'videorate'.

I feel it induces a latency of ~20ms, while reducing fps from 60fps to
30fps. I guess it is because it depends on time-stamp of buffer.

Is there any element which can just dump alternate buffers.

I have tried 'identity drop-probability=0.5', I found dumping is not
consistent for alternate buffers.

Please correct me, if I am wrong somewhere.

-Jai



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[Nicolas Dufresne-5]

Le mer. 9 oct. 2019 17 h 40, jeyp4 <[hidden email]> a écrit :

How can alternate buffers be dropped in efficient manner.
I have read and tried  'videorate'.

I feel it induces a latency of ~20ms, while reducing fps from 60fps to
30fps. I guess it is because it depends on time-stamp of buffer.

Would need to be investigated, I wonder why it would do that. Do you use drop-only property?

Is there any element which can just dump alternate buffers.

I have tried 'identity drop-probability=0.5', I found dumping is not
consistent for alternate buffers.

Please correct me, if I am wrong somewhere.

-Jai



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[Thornton, Keith]

Hi,
you could add a pad-probe to one of your pads and drop every second buffer.
Gruesse

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Von: gstreamer-devel <[hidden email]> Im Auftrag von jeyp4
Gesendet: Mittwoch, 9. Oktober 2019 23:01
An: [hidden email]
Betreff: How can alternate buffers be dropped efficiently?

How can alternate buffers be dropped in efficient manner.
I have read and tried  'videorate'.

I feel it induces a latency of ~20ms, while reducing fps from 60fps to 30fps. I guess it is because it depends on time-stamp of buffer.

Is there any element which can just dump alternate buffers.

I have tried 'identity drop-probability=0.5', I found dumping is not consistent for alternate buffers.

Please correct me, if I am wrong somewhere.

-Jai



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[jeyp4]

Yes I think using "drop-only = true" is efficient. I tried it and felt
satisfied. Thank you

gst-launch-1.0 -v v4l2src device=/dev/video1 ! 'video/x-raw,
width=1280,height=720' ! videorate drop-only = true !
video/x-raw,framerate=25/1 ! xvimagesink




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[Nicolas Dufresne-5]

Le jeu. 10 oct. 2019 05 h 41, jeyp4 <[hidden email]> a écrit :

Yes I think using "drop-only = true" is efficient. I tried it and felt
satisfied. Thank you

gst-launch-1.0 -v v4l2src device=/dev/video1 ! 'video/x-raw,
width=1280,height=720' ! videorate drop-only = true !
video/x-raw,framerate=25/1 ! xvimagesink

That being said, it leaves me the impression there is a bug in the timestamp recalculation when drop only isn't set.

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