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  • Revision 9bcd361617 : Remove unused parameters from update_state_rt() In addition, a local variable w

    1er mars 2014, par Yaowu Xu

    Changed Paths :
     Modify /vp9/encoder/vp9_encodeframe.c



    Remove unused parameters from update_state_rt()

    In addition, a local variable was renamed to avoid confusion.

    Change-Id : Id4c497f9cfa219e8a414aa9fee9a85af5f147249

  • Revision 2d6bd24b96 : Merge "Revert "Making vp9_get_sse_sum_{8x8, 16x16} static.""

    27 mai 2014, par Yaowu Xu

    Merge "Revert "Making vp9_get_sse_sum_8x8, 16x16 static.""

  • Making volume adjustments at precise time with ffmpeg -filter_complex

    25 février 2023, par a1s2d3f4

    I am using the following command to mute parts of the audio file with ffmpeg :

    


    ffmpeg.exe -y -i "C:\temp\inputfile3.wav" -filter_complex_script "C:\temp\filter_complex_cmds.txt" "C:\temp\outputfile3.wav"


    


    Inside filter_complex_cmd.txt I have :

    


    [0]aformat=sample_fmts=fltp:sample_rates=44100:channel_layouts=stereo,volume='if(between(t,0.95,1.05),0*(t-0.95) + 0,1)':eval=frame,volume='if(between(t,1.15,1.25),0*(t-1.15) + 0,1)':eval=frame,volume='if(between(t,1.41,1.49),0*(t-1.41) + 0,1)':eval=frame,volume='if(between(t,2.10,2.35),0*(t-2.10) + 0,1)':eval=frame,volume='if(between(t,2.75,2.85),0*(t-2.75) + 0,1)':eval=frame, etc. x1000...


    


    You get the idea - many, many calls to reduce volume at specific times.
However, when I look at outputfile3.wav, the volume is not reduced from 0.95000 to 1.05000 seconds, but instead from 0.952018 to 1.068118 (i.e. off by 2 and 18 milliseconds respectively) and not from 1.150000 to 1.250000 seconds but from 1.160998 to 1.253878 milliseconds, etc. It can sometimes be off by as many as 20 milliseconds.

    


    Can anyone tell me what's going on and what to do to make it precise ?

    


    Also, while I can reserve it for a separate question, but I also want to be able to find a fade out/fade in commands that would make this change to and from silence a bit more smooth by dialing it down and up over the course of 20 milliseconds around my "volume 0" times.

    


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