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  • truehd : add hand-scheduled ARM asm version of ff_mlp_rematrix_channel.

    20 mars 2014, par Ben Avison
    truehd : add hand-scheduled ARM asm version of ff_mlp_rematrix_channel.

    Profiling results for overall audio decode and the rematrix_channels function
    
in particular are as follows :
    

                  Before          After
    
              Mean   StdDev   Mean   StdDev  Confidence  Change
    
6:2 total     370.8  17.0     348.8  20.1    99.9%       +6.3%
    
6:2 function  46.4   8.4      45.8   6.6     18.0%       +1.2%  (insignificant)
    
8:2 total     343.2  19.0     339.1  15.4    54.7%       +1.2%  (insignificant)
    
8:2 function  38.9   3.9      40.2   6.9     52.4%       -3.2%  (insignificant)
    
6:6 total     658.4  15.7     604.6  20.8    100.0%      +8.9%
    
6:6 function  109.0  8.7      59.5   5.4     100.0%      +83.3%
    
8:8 total     896.2  24.5     766.4  17.6    100.0%      +16.9%
    
8:8 function  223.4  12.8     93.8   5.0     100.0%      +138.3%
    

    The assembly version has also been tested with a fuzz tester to ensure that
    
any combinations of inputs not exercised by my available test streams still
    
generate mathematically identical results to the C version.
    

    Signed-off-by : Martin Storsjö <martin@martin.st>
    • [DBH] libavcodec/arm/mlpdsp_armv5te.S
    • [DBH] libavcodec/arm/mlpdsp_init_arm.c

  • truehd : add hand-scheduled ARM asm version of ff_mlp_rematrix_channel.

    20 mars 2014, par Ben Avison
    truehd : add hand-scheduled ARM asm version of ff_mlp_rematrix_channel.

    Profiling results for overall audio decode and the rematrix_channels function
    
in particular are as follows :
    

                  Before          After
    
              Mean   StdDev   Mean   StdDev  Confidence  Change
    
6:2 total     370.8  17.0     348.8  20.1    99.9%       +6.3%
    
6:2 function  46.4   8.4      45.8   6.6     18.0%       +1.2%  (insignificant)
    
8:2 total     343.2  19.0     339.1  15.4    54.7%       +1.2%  (insignificant)
    
8:2 function  38.9   3.9      40.2   6.9     52.4%       -3.2%  (insignificant)
    
6:6 total     658.4  15.7     604.6  20.8    100.0%      +8.9%
    
6:6 function  109.0  8.7      59.5   5.4     100.0%      +83.3%
    
8:8 total     896.2  24.5     766.4  17.6    100.0%      +16.9%
    
8:8 function  223.4  12.8     93.8   5.0     100.0%      +138.3%
    

    The assembly version has also been tested with a fuzz tester to ensure that
    
any combinations of inputs not exercised by my available test streams still
    
generate mathematically identical results to the C version.
    

    Signed-off-by : Michael Niedermayer <michaelni@gmx.at>
    • [DH] libavcodec/arm/mlpdsp_armv5te.S
    • [DH] libavcodec/arm/mlpdsp_init_arm.c

  • FFMPEG concat causing longer duration on joined file

    15 février 2019, par Pit Digger

    I have 5 files. Total duration of files should be 942 seconds based on length of source files. However when joined using ffmpeg concat. End result is 944 seconds. I am unable to pinpoint where are additional seconds coming from. Anyone got such known issue ?

    ffmpeg -f concat -i input.txt -codec copy output.mp4

    and following is input.txt

    file ’0.mp4’ file ’1.mp4’ file ’2.mp4’ file ’3.mp4’ file ’4.mp4’

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