webmgen's Introduction

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

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