<p>
This chapter provides a short primer on video files, formats and
- codecs – because it is often cause for confusion:
+ codecs – because it is often cause for confusion:
</p>
<p>
A video file is a <dfn>container</dfn>. It usually contains one
- <dfn>video track</dfn> and one or more <dfn>audio tracks</dfn>.
- How these tracks are stored in the file is defined by the
+ <dfn>video track</dfn>, one or more <dfn>audio tracks</dfn>, and possibly <dfn>
+ subtitle</dfn> tracks, <dfn>chapters</dfn>…
+ The way these tracks are stored in the file is defined by the
<dfn>file format</dfn>. Common formats are
avi, mov, ogg, mkv, mpeg, mpeg-ts, mp4, flv, or vob.
</p>
<p>
Not all codecs can be packed into a given format. For example the
mpeg format is limited to mpeg2, mpeg4 and mp3 codecs (not entirely true).
- DVDs do have stringent limitations as well. The opposite would be .avi;
+ DVDs do have stringent limitations as well. The opposite would be .avi:
pretty much every audio/video codec combination can be contained in an avi
file-format.
</p>
</p>
<p>
The export dialog includes presets for common format and codec
- combinations (such as DVD, web-video,..). If in doubt use one of the
- presets.
+ combinations (such as DVD, web-video,..). If in doubt, one of the
+ presets should be used.
</p>
<p>
- As last note: every time a video is transcoded, the quality can only get
+ As a last note: every time a video is transcoded, the quality can only get
worse. Hence for the final mastering/<abbr
title="Multiplexing Audio and Video">muxing</abbr> process, one should
- always to back and use the original source of the video.
+ always go back and use the original source of the video.
</p>
-