README

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).

Features

• Set video and audio bitrate
• Downscale resolution
• Limit output size
• Split output into multiple files of given size
• Cut video before encoding

Examples

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

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