Hi, I can now confirm, that ffmpeg quits when trying to process a glc file with changing pixel size. But I found an easy way to bypass it, we where looking at the wrong side for rescaling! glc-play has it own rescale function, use it and it should work.
Code:
glc-play video.glc -r 400x200 -y 1 -o - | ffmpeg -i - -vcodec libvpx -b 500k -an -threads 2 video.webm
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