Video Player
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*1G of storage should give several hours of mpeg4 video, as the quality can be reduced somewhat without being visible on the screen. | *1G of storage should give several hours of mpeg4 video, as the quality can be reduced somewhat without being visible on the screen. | ||
− | From a conversation with XorA, in [ | + | From a conversation with XorA, in the [irc://freenode.com/#openmoko IRC channel]. |
400kbps mpeg4 works on a 200Mhz neo (without sound) on prerotated 240*320 ffmpeg codec videos, at 25fps, using stock mplayer. | 400kbps mpeg4 works on a 200Mhz neo (without sound) on prerotated 240*320 ffmpeg codec videos, at 25fps, using stock mplayer. |
Revision as of 22:05, 16 February 2007
Not a proper 'app' page, just an overview of my understanding. --Speedevil 17:39, 16 February 2007 (CET)
Video is problematic.
On the minus side.
- The CPU is certainly not fast enough to decode 480*640 video.
- The display is portrait, which means that an additional rotation step is needed for most landscape video, adding to CPU usage.
- Downloading an arbitrary video, and playing it without transcoding it, then playing it later will not be possible.
However.
On the positive side.
- The LCD can be switched to a 240*320 stretch mode, which is much less taxing.
- Re-encoding video to rotate it, and scale to 320*240, and encoding with a low CPU use codec such as MPEG-1 may well make half-screen doubled videos playable at 25fps.
- If not, then it almost certainly will be possible at 12fps.
- Playing most very small - postage stamp - videos as are sent by many phones should be possible.
- 1G of storage should give several hours of mpeg4 video, as the quality can be reduced somewhat without being visible on the screen.
From a conversation with XorA, in the IRC channel.
400kbps mpeg4 works on a 200Mhz neo (without sound) on prerotated 240*320 ffmpeg codec videos, at 25fps, using stock mplayer.
With sound, this drops to 18fps.
There are optimisations for mplayer that look promising to get 25fps with sound.