[maemo-users] [maemo-users] Video encoding

From: Ed Okerson ed at okerson.com
Date: Thu Feb 16 18:13:46 EET 2006
My preferred resolution for 4:3 content is 320x240 at 25fps 300Kbps.  For
general TV viewing it is very watchable.  For 16:9 content I use 320x176
25fps 300kbps.  For both I generally encode the audio as MP3 at 32kbps.

All scaling of video is done by the DSP, and then pixel doubled by the
display controller.  There is no such thing as pixel tripling.


> Hello all,
> What are the best settings for encoding video to view on Nokia 770
> considering performance and quality limitations?
> On http://maemo.org/maemowiki/VideoEncoding suggested resolutions are
> 240x144, 352x208 and the others. Also there is information that the
> device supports hardware pixels doubling for video decoding purposes:
> http://maemo.org/maemowiki/GameDevelopment
> So my guess is that actually screen resolution is 400x240 for video
> decoding. Considering all that, would not 320x240 (4:3) be an optimal
> resolution for video as it would not need any scaling performed by CPU?
> All that is left is to select proper bitrate to avoid frames skipping.
> By the way, is it possible to get information if there are any frames
> skipped when playing video?
> Also 208x160 seems a good resolution too if there is something like
> hardware pixels tripling supported as well. And even if it is not
> accelerated, it should at least not degrade quality when scaled (x3
> scaling can be probably performed with no quality loss at all).
> Am I right/wrong? Any comments?
> PS. I'm a complete newbee at encoding video, everything that is written
> here might be completely wrong, so don't beat me too hard please :)
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