[FFmpeg-devel] Request for comment: Tutorial
Ulrich von Zadow
Sun May 27 20:47:59 CEST 2007
Stephen Dranger schrieb:
> I have written a rather lengthy ffmpeg tutorial that starts by going
> over Martin Bohme's old tutorial, then proceeding to recreate
> ffplay.c, teaching about how ffmpeg, SDL, and video in general works.
> Here's the link:
> I am a relative newcomer to ffmpeg, however, and there may be some
> factual errors. I've tried my best to figure out exactly how the
> ffmpeg libraries work, and it's undergone a lot of revisions, so
> hopefully I've gotten everything right.
First of all, exceptional work.
One small nit:
You describe YUV420P as 'containing 2 color samples for every 4 luma
samples, so the color information is halved.' (Tutorial 2, second
Actually, YUV contains one Cb and one Cr sample for every 4 Y samples,
so the color information is quartered. The Cb and Cr planes are each
half as big in width _and_ height.
(http://www.answers.com/topic/ycbcr-sampling explains this in more detail.)
Also, if it's easy to do, a version that has the whole tutorial on one
printable page would be great.
Ulrich von Zadow | tel: +49-172-7872715
c_riftf?hrer, c-base e.V. | jabber: cocacoder at jabber.berlin.ccc.de
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