some useful assets conversions for websites

assets-helpers.sh

# convert video to webm
# https://thethemefoundry.com/blog/convert-mp4-to-webm/
ffmpeg -i myvideo.mp4 -c:v libvpx -crf 10 -b:v 1M -c:a libvorbis myvideo.webm

# convert between image formats
convert myimg.png myimg.jpg

# convert images to webp
# https://www.npmjs.com/package/webp-converter-cli
# to convert all in current directory:
webpc -r

# get first frame of a video (useful for video posters)
# https://stackoverflow.com/a/44073745
ffmpeg -i inputfile.mp4 -vf "select=eq(n\,0)" -q:v 3 outputimage.jpg