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

[Rafael Penna]

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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