[MPlayer-dev-eng] why my mplayer-android porting have lower performance than many other players ?

[compn]

On Fri, 24 Aug 2012 02:34:53 +0800, lean fu wrote:
>I want mplayer only demux files and skip all decoding steps  of  P and B
>frames until the next I  frame comes,another words,i want mplayer try it's
>best to catch the audio.
>i can accept picture loss,but can't accept picture seems completly halt
>,how can i do this ?, any rely is appreciated, thanks.

somethings you can do to speed it up:

my test with 1280x720p rv40 rmvb on 1.5mhz p4:

no options, 30 seconds of video:
BENCHMARKs: VC:  32.807s VO:  16.934s A:   0.000s Sys:   0.210s =   49.951s
BENCHMARK%: VC: 65.6784% VO: 33.9012% A:  0.0000% Sys:  0.4204% = 100.0000%

-vf framestep=10
BENCHMARKs: VC:  32.909s VO:   3.351s A:   0.000s Sys:   0.274s =   36.534s
BENCHMARK%: VC: 90.0777% VO:  9.1723% A:  0.0000% Sys:  0.7500% = 100.0000%

-lavdopts skipframe=nonref
BENCHMARKs: VC:  17.713s VO:   6.106s A:   0.000s Sys:   0.212s =   24.031s
BENCHMARK%: VC: 73.7090% VO: 25.4088% A:  0.0000% Sys:  0.8822% = 100.0000%

-lavdopts skipframe=nonref -vf framestep=10,scale=320:240
BENCHMARKs: VC:  17.909s VO:   0.396s A:   0.000s Sys:   0.246s =   18.551s
BENCHMARK%: VC: 96.5393% VO:  2.1347% A:  0.0000% Sys:  1.3261% = 100.0000%

h264 720p:
no options
BENCHMARKs: VC:  15.082s VO:  13.188s A:   0.000s Sys:   1.671s =   29.941s
BENCHMARK%: VC: 50.3724% VO: 44.0466% A:  0.0000% Sys:  5.5810% = 100.0000%

-lavdopts skipframe=nonref
BENCHMARKs: VC:   7.670s VO:   6.851s A:   0.000s Sys:   1.412s =   15.933s
BENCHMARK%: VC: 48.1391% VO: 42.9988% A:  0.0000% Sys:  8.8621% = 100.0000%

-lavdopts skipframe=nonref -vf scale=320:240
BENCHMARKs: VC:   7.731s VO:   4.053s A:   0.000s Sys:   1.627s =   13.411s
BENCHMARK%: VC: 57.6467% VO: 30.2215% A:  0.0000% Sys: 12.1318% = 100.0000%

-lavdopts skipframe=nonref -vf framestep=10
BENCHMARKs: VC:   7.890s VO:   0.628s A:   0.000s Sys:   1.588s =   10.106s
BENCHMARK%: VC: 78.0724% VO:  6.2141% A:  0.0000% Sys: 15.7134% = 100.0000%

-lavdopts skipframe=nonref -vf framestep=10,scale=320:240
BENCHMARKs: VC:   7.639s VO:   0.464s A:   0.000s Sys:   1.479s =    9.582s
BENCHMARK%: VC: 79.7224% VO:  4.8424% A:  0.0000% Sys: 15.4352% = 100.0000%

you can play with the options and get it to your satisfaction.

lavdopts skipframe is in the mplayer manual.

note that on some systems , if you scale the video to a lower res, it will display faster, due to slow video output.

to run your own benchmarks, use mplayer -benchmark -endpos 30 -nosound file

-compn