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AVI playback

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saratoga:

--- Quote from: sirdan on October 05, 2009, 06:18:12 PM ---
--- Quote from: AlexP on October 05, 2009, 01:00:57 PM ---On everything except the ipod video, Rockbox gets better frame rates than the original firmware (where they do video at all that is).

--- End quote ---

I think that problem can be resolved for ipod video users.

Since Im keen on video compression/decompression stuff, i decided to do some tests showing how encoding settings influence playback. Im on sansa e200 but it can be applied to others targest as well. Here are my benches on Elephant dream:

240x128; 24fps; 11min realtime playback
240x128; 24fps; 7min bench time
240x128; 15fps; 5min bench time
240x128; 12fps; 4min bench time
176x100; 24fps; 5min bench time
240x128; 24fps; half bitrate; 6:30 min bench

Every file has the same duration, so we see how playback speed scales with different configs. Shorter bench time=battery savings.

Now word about Ipod video. It plays 320x240 24fps clip at 19 fps. So the most simple way to achieve realtime is convert original fps to below 19 fps..;)

--- End quote ---

I think the wiki already recommends that people not use higher frame rates then they can decode, so its not really necessary that you "resolve" this problem.

Llorean:
Not only does the wiki recommend this, but most of the presets and recommended conversion command lines predate performance improvements, so some of them (notably the WinFF ones) should result in files converted to framerates low enough to even leave some elbow room for particularly complex scenes and bitrate spikes.

reszerve:
I take it there's no progress on this?  ???

I realise that many targets won't be capable, but as a gigabeat owner I find it wretched having to convert to mpegs.  This is my second most wanted improvement for RockBox.

Going forward, even those awful locked-down players like Zune seem to have this feature now.

Llorean:
Even with a gigabeat you'd in many cases still have to convert your files anyway, because they'd need to be adjusted for the screen size.

If it's the requirement for conversion that's wretched, don't expect that ever to realistically be banished for many players. Even the Zune has format restrictions and size restrictions, and often the file needs to be converted while syncing.

AlexP:
If someone were to write the code to decode other codecs, then I'm sure it'd be incorporated.  However, converting videos is a damn site quicker and easier than writing e.g. xvid support for Rockbox.  Someone that wants it enough to bother needs to write it.

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