[x264-devel] Re: making a demo/tutorial movie

[Maarten de Boer]

You can use mplayer to do this:

mplayer -vo png archive.264
mplayer -vo jpeg archive.264



On Tue, 30 May 2006 11:28:55 -0300
"Rafael Penna" <rapennas at gmail.com> wrote:

> Hi,
> 
> sorry for my bad english. Thanks for help me in the codification of
> x264 video. I would like to know how can i decode a video using x264,
> from the "archive.264" i would like get the frames in png or jpeg.
> 
> Thanks!
> Rafael
> 
> On 5/22/06, Maarten de Boer <mdeboer at iua.upf.edu> wrote:
> > Hello,
> >
> > I am making a demo video of an application I am writing. I post
> > my experiences since they might be handy for someone else, but
> > also to ask for some advice on the encoding settings.
> >
> > The application I am making the demo video of has a rather standard
> > GUI: sliders, buttons, text. The demo shows how to use this application,
> > accompanied with spoken text. I write 10 screenshots/second to disk
> > (including mouse cursor). This was very easy with the GUI library I
> > use, fltk, which has a function to read the pixels of the current window
> > into a buffer, which then can be written to disk, but it could also be
> > done with xvidcap.
> >
> > Finally, I convert these images to a movie, with the following steps
> > (all under Linux):
> >
> > I use a fifo to avoid the need of a large intermediate yuv file.
> >
> > $ mkfifo /tmp/foo.y4m
> > $ png2yuv -j video_%04d.png -f 10 -I p -S 420mpeg2 > /tmp/foo.y4m
> >
> > In another shell, read from the fifo, and write the to h264:
> >
> > $ x264 --fps 10 -B 500 -o "foo.264" /tmp/foo.y4m
> >
> > Would it be possible to do the above in a single step? x264 does not
> > seem to be able to read from the stdin, but ideally, I'd rather pipe
> > png2yuv output to x264.
> >
> > Next, I have some audio (spoken while using the application) which I
> > convert to aac:
> >
> > $ faac -b 128 --mpeg-vers 4 foo.wav
> >
> > Finally, I join audio and video in an mp4 file:
> >
> > $ MP4Box -fps 10 -new -add foo.264 -add foo.aac foo.mp4 -hint
> >
> > The resulting video looks ok, and plays fine under quicktime, but I am
> > sure that I could use some x264 settings more suitable for this kind of
> > material (screenshots). I was hoping that someone has some experience
> > with this, and could share it. Would it be advisable to do multipass
> > encoding?
> >
> > Kind regards, and thanks for a great tool.
> >
> > Maarten
> >
> > --
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> >
> >
> 
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> 
> 

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