I've reached the conclusion the Pi Zero isn't upto this. I had 300 images from a failed attempt earlier (no tweet = no delete) and just ran the ffmpeg on the pi400. With the crf set at 1 for high quality it took just 30s to make the movie from the stills.
I'll upgrade to a pi4 and use the zero for youtube streaming as it seems ok at that.
I've reached the conclusion the Pi Zero isn't upto this. I had 300 images from a failed attempt earlier (no tweet = no delete) and just ran the ffmpeg on the pi400. With the crf set at 1 for high quality it took just 30s to make the movie from the stills.
I'll upgrade to a pi4 and use the zero for youtube streaming as it seems ok at that.