Convert mp4 videos to webm.
You need to specify a bitrate. For great quality, use 8M as the first argument. For alright quality, use 2M as the first argument. You can specify whatever you want. The higher the bitrate, the larger the filesize will be. All other arguments are treated as converting certain files only.
# Convert all files in current directory with 8M bitrate
mp4towebm 8M
# Convert certain files with 4M bitrate
mp4towebm 4M file.mp4 other_file.mp4 last_file.mp4
# Convert certain files with 3M bitrate
mp4towebm 3M new_*.mp4 to_process*.mp4
# Recursively convert all mp4 files with 8M bitrate
find . -type f -iname "*.mp4" -exec mp4towebm 8M '{}' \;