Blocky video artefacts in timelapse

[adymac101]

I'm experience random blocky artefacts in my timelapses. Some nights are worse than others. I think it started happening after I introduced a crop to the image as follows (using ASI676MC and wanted to make the image a little larger) and so far only seems to happen on darker, cloudy nights.

Crop images before stretching and saving.

CROP_IMAGE="true"
CROP_WIDTH=2828
CROP_HEIGHT=2828
CROP_OFFSET_X=0
CROP_OFFSET_Y=0

Is this a known issue?

[EricClaeys]

@adymac101, let's first make sure the images used to create the timelapse are ok - look at a few using the "Images" link on the WebUI. Try for the same time you see blockiness in the timelapse.
I suspect they are ok. If so, add -level 3.1 to TIMELAPSE_EXTRA_PARAMETERS in config.sh. Then run:

cd ~/allsky/images
mkdir test
mv 20240820/*.mp4 test
generateForDay.sh --timelapse 20240820

and using the "Images" link, compare the new timelapse for Aug 20 to the prior "bad" one which is now in the "test" day.

Let me know how it goes.

[adymac101]

Thanks for the quick follow up Eric. This change didn't make any difference and the source images are fine so I did some more troubleshooting and through a process of elimination have determined that the issue appears to be with my Edge browser or display driver combination as when the same mp4 is viewed in Windows Media Player or through Chrome the artefacts are not present. Sorry for the false alarm.

[EricClaeys]

Interesting, I've never had anyone report that Edge causes problems. I use it and don't have the issue.
If you find out more information, let me know.
Thanks.

[adymac101]

I've turned off GPU acceleration in Edge - problem resolved. Will update display drivers etc.