This script converts the given input file to webm. It's a wrapper around ffmpeg with the purpose of being easier to use when doing simple conversions. Files are encoded with VP8/Vorbis (two-pass).
- Set video and audio bitrate
- Downscale resolution
- Limit output size
- Split output into multiple files of given size
- Cut video before encoding
Convert to webm using default encoding settings (-b 1M, -a 128K):
webmgen input.mp4
Set video and audio bitrate to 2 Mb/s and 256 Kb/s respectively:
webmgen -b 2M -a 256K input.mp4
Limit file size to 5 MB:
webmgen -s 5M input.mp4
Cut first 30 seconds of video before converting:
webmgen -c ,00:00:30 input.mp4
Split into multiple files of size 500 KB:
webmgen -p -s 500K input.mp4
Downscale resolution to 720p, keeping aspect ratio:
webmgen -r 720 input.mp4
Usage: webmgen [OPTIONS] FILE
Convert FILE to VP8-encoded webm.
Output is saved in the same directory of FILE, unless -d option is used.
Where appropriate, options accept the following unit prefixes: K, M, G.
Options:
-r RESOLUTION vertical RESOLUTION (keeps aspect ratio)
-b BITRATE video BITRATE (default: 1M)
-a BITRATE audio BITRATE (default: 128K)
-s SIZE SIZE of output file(s), expressed in bytes. Actual size can be slightly more
or less than requested size. If -p is not set, bitrate specified by -b is ignored.
-p split output into multiple files. Requires -s.
-c [START],[END] cut input file from START to END before encoding.
START, END are formatted as HH:MM:SS; only one can be omitted.
-d DIRECTORY output DIRECTORY (default: directory of input FILE)
-t THREADS number of threads to use for encoding (default: one less than the number of CPUs)
-v verbose mode
-h show help and exit