[HOW-TO] Get rid of missing frames while set up circular buffer about picamera2 HOT 4 CLOSED

Hi, I think mostly the problem is that you're asking it to encode 2304x1296 @ 40fps which is beyond its capabilities. It will work better if you change the main stream format to YUV420 as this will save a pixel format conversion (so use main={"size": (2304,1296), "format": "YUV420"}) but even with this it won't achieve what you want.

My rule of thumb is that so long as there's not much else going on, you should get "close" to 1080p50. So you should certainly be able to manage 1080p40, or 2304x1296 @ 30fps. (2304x1206 is 44% larger than 1080p.)

A few other minor tips: when it drops an I-frame from the start of the circular buffer, it has to drop all the P-frames up to the next I-frame. So you generally find up to iperiod fewer buffers there than you might have expected. Also, by stopping the output before stopping the encoder you'll be losing any frames still queued up in the encoder. So maybe just drop the output.stop() - the output will be stopped anyway once the encoder is done.

from picamera2.

Thank you su much! It works way better. Could you tell me how to add the timestamps.txt while using circular output, too?

from picamera2.

Unfortunately I don't think the CircularOutput class has ever been made to support timestamps properly. It looks like it would need to store them in the fifo so that it can write them out later. I don't know if that's something you'd know how to change...?

from picamera2.

i'll have a look. Thanks

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