August 2010
Intermediate to advanced
222 pages
7h 12m
English
Content preview from HTML5: Up and Running
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Batch Encoding Ogg Video with ffmpeg2theora
(As in the previous section, in this section I’m going to use “Ogg video” as a shorthand for “Theora video and Vorbis audio in an Ogg container.” This is the combination of codecs+container that works natively in Mozilla Firefox and Google Chrome.)
There are a number of offline encoders for Ogg video. If you’re looking at batch encoding a lot of video files and you want to automate the process, you should definitely check out ffmpeg2theora.
ffmpeg2theora is an open source, GPL-licensed application for encoding Ogg video. Prebuilt binaries are available for Mac OS X, Windows, and modern Linux distributions. It can take virtually any video file as input, including the DV video produced by many consumer-level camcorders.
To use ffmpeg2theora, you need to call it from the command line. (On Windows, go to Start Menu→Programs→Accessories→Command Prompt. On Mac OS X, open Applications→Utilities→Terminal.)
Figure 5-12. Encoding in progress
ffmpeg2theora can take a large number of
command-line flags. (Type ffmpeg2theora
--help to read about them all.) I’ll focus on just three of
them:
--video-quality, whereQQ--audio-quality, whereQQ--max_size=, whereWxHWHxin between is really just the letter “x”.) ffmpeg2theora will resize the video ...
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O’Reilly covers everything we've got, with content to help us build a world-class technology community, upgrade the capabilities and competencies of our teams, and improve overall team performance as well as their engagement.Julian F.
I wanted to learn C and C++, but it didn't click for me until I picked up an O'Reilly book. When I went on the O’Reilly platform, I was astonished to find all the books there, plus live events and sandboxes so you could play around with the technology.Addison B.
I’ve been on the O’Reilly platform for more than eight years. I use a couple of learning platforms, but I'm on O'Reilly more than anybody else. When you're there, you start learning. I'm never disappointed.Amir M.
I'm always learning. So when I got on to O'Reilly, I was like a kid in a candy store. There are playlists. There are answers. There's on-demand training. It's worth its weight in gold, in terms of what it allows me to do.