GLC

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Revision as of 21:05, 14 July 2010 by Doorknob60 (Talk | contribs) (Encoding)

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Introduction

GLC is an ALSA & OpenGL capture tool for Linux. It consists of a generic video capture, playback and processing library and a set of tools built around that library. GLC should be able to capture any application that uses ALSA for sound and OpenGL for drawing. It is similar to Fraps on Windows.

Installation

To install GLC, simply install the glc package from AUR.

Usage

The basic usage is simple. Just run this:

glc-capture [application]

Press Shift + F8 to start and stop recording. By default, it will save a (large) .glc file in your home folder. You can then play or encode it. For complete list of available options see

glc-capture --help

Playback

To play a captured stream directly, execute

glc-play [stream file]

ESC stops playback, f toggles fullscreen and Right seeks forward.

Encoding

In order to use the videos outside of glc-play, you will need to encode it. Here are two scripts that work well for encoding, one for Google's new open source WebM format, and one for the popular H.264 format.

For either script, run with the following context (assuming it's saved as glc-encode.sh):

glc-encode.sh filename.glc

WebM: This script requires the following packages: vorbis-tools, ffmpeg, and mkvtoolnix

#!/bin/bash
glc-play $1 -a 1 -o - | oggenc - -b 128k -o glc.ogg
glc-play $1 -o - -y 1 | ffmpeg -i - -vcodec libvpx glc.webm
mkvmerge -o output.webm glc.webm glc.ogg
rm glc.ogg
rm glc.webm

It will output as output.webm

H.264: This script requires the following packages: ffmpeg

#!/bin/bash
glc-play $1 -a 1 -o glc.wav
glc-play $1 -o - -y 1 | ffmpeg -i - -i glc.wav -acodec libfaac -ab 128k -ac 2 -vcodec libx264 -vpre hq -crf 22 -threads 0 output.mp4
rm glc.wav

It will output as output.mp4

External Links

  • [1] - Homepage, and they have a good wiki there as well