I have a web site at http://dingo-den.com and I download an image every minute and at the nd of the day I create a AVI video. When this video is played back almost every one has some distortion, usually at the bottom of the frame that is jittery.

I have looked at each image for yesterday and none are distorted so I assume that it is somewhere in the video creation.

I use this to create the video. I am not a programmer so I just google a lot and after a long time I found this to be the best method, ecept for the jitter. I have looked at the options for ffmpeg but I do not know anything about video creation so I am lost/
Any help would be appreciated.

I just had a look at the images from the latest video created today and the distortion is on the images before the video is created. Is there a way to fix these images after being downloaded.

This is the way I get the image from the source:

wget would be better for that purpose, not ffmpeg. Without the '-c copy' option, ffmpeg will still convert the media while wget leaves its 'cargo' alone. How are you getting the images every minute? Your image-grabbing ffmpeg command overwrite the same image.

http://dingo-den.com/index.php?nav=timelapse If this is the result of your work posted here, then the distortion/jittery part are incomplete frames, either by you or by its server's capturing/sharing process. If that's not the correct video, please post an example video or one (or a few) of the frames where you see this distortion/jittery.

I see what you mean. The lenz on the camera seems to be distorting the bottom part of the image a little. I don't know if there is anything that can be done for that.

This does not look too bad except for a few bad images..
https://www.youtube.com/watch?v=Rmww71ITJsA

That parts is easy
Does it have to be an avi? I would rather have a x264 mp4. Since the images are all the same size, and no sound, that is fairly easy.

Example:
Modify the output framerate, and image viewing time as you wish.

Here is a site that has lots of advice about how to create movies (slideshows) from still images.
https://www.bannerbear.com/blog/how-...s-with-ffmpeg/

Thanks for the replies. I think that my main problem of the image distortion at he bottom is not fixable. Unless there is some sort of test I can do after the image is downloaded then download the image again ???

I don't see the distortion you speak of but I do see the artifacts in some of the frames. Unless you're talking about the wide angle lens distortion? Which is natural to my eyes (I've seen it so many time I'm used to it). Some programs (maybe Darktable?) can fix lens distortion but I've never tried that on thousands of images in batch mode.

If the artifacts were already in the downloaded images after the capture events, then no, nothing you can do. Unless you invent a time machine to go back in time to try again. However, maybe the owner of the webcam has an archive system in place and maybe you can contact them to see if they'll give you a copy.

When I do these webcam image grabs via bash scripts, I usually have the grab timer set to half of whatever the online webcam's update timer is set to. That'll give me two same images per webcam's image update. I then go back to review and select the best one of the pairs. It's more work but for me, it's worth the end result.

With this method, I've run into situations where I had only one good copy of the pair. Sometime I don't have either. It's usually because the script has run again on top of a previous image grab that is taking too long to complete and the script then clobbered that previous job. One minute update/grab cycle is actually too fast for the grab script sometime. Maybe there's a hiccup or a lag in the internet connection, maybe the grab script started in the middle of the server's image update, maybe the grab-image computer is suddenly 100% CPU from another program, etc, etc.

That is what I think has happened to your images.

What the script should do is off-load a grab job and let it complete its grab independently and still have the script be able to start off another grab job on the next one minute cycle to complete independently. I do not know bash scripting well enough to pull this off. Maybe someone here can offer an insight on this. I've strikethroughed this idea. It won't work if the server updated its image in the middle of a grab. There's nothing left of the previous image to grab anymore. The script need to complete in time.

I ran a cron job using wget to grab those images at one minute intervals and found about 30 or so out of 1600+ that were hosed.

I was able to see the damaged ones by using the ffmpeg command suggested by teckk and using a 2 second frame rate so each image was displayed for 2 seconds.

The only fix possible is to follow the suggestions above to grab 2 copies per update on the webcam then view them and drop the ones that are damaged plus one copy of each that is undamaged, or with a single copy to just drop the damaged images and not have an exact time ratio throughout the movie.

Ok thanks for the replies you have given me a lot to think about and explore.