Support and General Use > Plugins/Viewers
AVI playback
saratoga:
--- Quote from: sirdan on November 17, 2010, 04:24:30 PM ---
--- Quote from: Datman on November 16, 2010, 06:45:55 PM ---I was thinking about what someone said in this thread: power requested for mpeg-4 decoding is too high for "our" audio players.
--- End quote ---
Can anybody tell me, how mpeg-4 (SP particularly) can be more power demanding than mpeg-2?
--- End quote ---
Is it actually more computationally complex? I was under the impression that they're not terribly different.
torne:
Very few people actually *use* MPEG-4 SP, is probably the reason. Adding it wouldn't solve the need to transcode everything, almost all MPEG-4 video out there is ASP.
And no, no version of MPEG is optimised in its specification for mobile CPUs.
MPEG-4 ASP implementations for ARM exist, sure, but they are more demanding than the majority of our players can support.
sirdan:
--- Quote from: torne on November 18, 2010, 05:42:23 AM ---Very few people actually *use* MPEG-4 SP, is probably the reason.
--- End quote ---
You mean AVI's on PC? Sure, why would any sacrifice b frames while nowadays its just so simple to decode it. But everybody use it on mobiles.
--- Quote ---Adding it wouldn't solve the need to transcode everything, almost all MPEG-4 video out there is ASP.
--- End quote ---
You need to transcode to mpeg2 anyway. But, i sure pple still shoot small clips by cameras in cells in 3gp/h263 format. Thats more or less mpeg4 SP - link
--- Quote ---And no, no version of MPEG is optimised in its specification for mobile CPUs.
--- End quote ---
Then i was wrong.
--- Quote ---MPEG-4 ASP implementations for ARM exist, sure, but they are more demanding than the majority of our players can support.
--- End quote ---
Well asp should be marvellous, but i think, still with sp we can have some gain over mpeg2. I wrote mpeg4 sp is just about or little bit better than h263. Well i hope that woudnt be step back comparing to existing mpeg2 encoder used for mpegplugin ::) And many existing 3gp/mp4 mobile recordings work just without recompression, just like that.
@saratoga
--- Quote ---Is it actually more computationally complex? I was under the impression that they're not terribly different.
--- End quote ---
B frames saves good amount of bits, but are more complex for decoder too. Qpixel makes it even harder.
Look i know we talk about portable players, but even on my one core CPU, xvid takes less power to decode than mpeg2 in HD (1080p). And the latter need much more bitrate to retain quality. Maybe its a matter of optimization though..
Im not insisting on anything. Just putting my 2 cents. ;)
PS. What about theora on arm? :)
saratoga:
--- Quote from: sirdan on November 18, 2010, 02:00:26 PM ---Im not insisting on anything. Just putting my 2 cents. ;)
--- End quote ---
Well if you're convinced that theres some point or advantage to this for your needs, then get to work porting a decoder and see how well it works.
sirdan:
OMG sure... if i knew how to code eh
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