[MPlayer-users] Getting started on apple
kichigai at comcast.net
Sun Aug 21 08:28:26 CEST 2005
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On Aug 20, 2005, at 14.02, m at de-minimis.co.uk wrote:
> I think I hadn't downloaded the standard mac installation properly,
> or something
> of the kind. Not quite sure what. Either way all is lovely and
> rosy now and
> everything I've thrown at it has played. Including one VCD that a
> sent me a couple of months back and that wouldn't play in Quicktime
> or windows
> movie player. Well done all of you!
> So what's the story about the codecs? I take it that they are
> machines, that the input language is mpeg or vcd or whatever, but
> what's the
> output? Do they run as a separate process?
Well, it would seem unlikely that we OS X users will see the codec
package. The codecs are (as I understand it) binary codecs. I also
*think* (don't quote me on this) that they are proprietary codecs,
that is to say, codecs that were developed by the owners, not an open
source project. Therefore, unlike projects like libavcodec and
ffmpeg, we will not see them ported to other platforms and
architectures (such as PowerPC).
Now, here's the story with how codecs work. They're just libraries.
The application (in this case, MPlayer or MEncoder) uses the codec to
decompress the video, much in the same way one would decipher a coded
message. After that, the application does whatever it needs with the
video frames. In the case of MPlayer, it displays it. "the output" as
you put it is a number of video rendering methods. At this point,
with a little coaxing, MPlayer will output video through either Core
Video, Quartz, XVideo, X11, X11 Overlay, Open GL/2, SDL, MPEG-PES,
YUV4MPEG, Targa, PNM and MD5SUM output renderers.
MPlayer works as a single process (or thread), doing all of those
jobs itself without calling on outside processes. Mind you, though,
this is a very simplified version, and leaves out a lot of exceptions
and more complex things, but I hope it will at least give you a basic
picture of what's going on.
> Regards, Max
"'What? Fly to the Moon? For Goodness Sakes!' My mother thought she
had raised some kind of imbicle son, because I would say 'We're going
to fly to the moon!'"
--David Kyle (Author of A Pictoral History of Science Fiction on
the Moon Landing)
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