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Sat Oct 2 15:15:04 UTC 2010
Ok, here's an example.
3800 JPEGS into a 77 MB OGV (Theora) file.
I gave up with youtube - it generated the preview as it was uploading
and it was 100% glitched.
Vimeo after the upload, got a perfect thumbnail of the very first
frame, but claimed there was a problem converting the video and urged
me to view their compression guidelines.
The ogv file itself I am not that impressed with either. The detail in
the shadows is lost altogether.
The subject of the video/animation is a negative Mandelbox (a 3d
fractal) generated by Mandelbulber* (a wonderful program) so it has
oodles of details.
Just wondered if anyone was experienced in encoding this kind of thing
and could share advice?
Here's the commandline I used
ffmpeg -i bs_demo_16bit.wav -f image2 -i image%05d.jpg -f ogg -flags
+aic -pass 2 -aspect 4:3 -vcodec libtheora -vb 4096k -acodec libvorbis
-ac 2 -vol 300 -ab 128k anim_theora_l2.ogv
I could try increasing the bit rate from 4096 but doesn't it have to
be a power of two? Then the video would be 144mb... I was wondering if
there's a way (or better codec) of getting more detail without
doubling the filesize?
James (sorry for this slightly confused post which probably contains
the answer to itself)
* the mandelbulber developer's you tube channel:
http://www.youtube.com/user/xlace
mandelbulber downloads http://sourceforge.net/projects/mandelbulber/
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