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Sur d’autres sites (6213)

  • Select song sample rate

    22 avril 2022, par Clamarc

    I have a folder with several mp3's and I needed to separate (copy) all the 4800 hz sample rate files to another folder.

    


    I have a folder "General Audios" and I created another one called "Audios 48000 sample rate"

    


    I'm running the ffprobe command that returns the sample rate value of each song.. but when I try to save the value in a string to be able to use the IF and copy only the ones with 48000 hz, I get a message that the command is a command input ? what is wrong ?

    


    md "C:\Users\%username%\Desktop\Áudios 48000 sample rate"

cd /d "C:\Users\%username%\Desktop\Áudios Gerais"

for %%F IN (*) do (
   ffprobe -i "%%F" -v error -show_entries stream=sample_rate ˆ
       -of default=noprint_wrappers=1:nokey=1 set %%S if %%S==48000 ˆ
          "C:\Users\%username%\Desktop\Áudios 48000 sample rate\%%F"
   )

pause


    


    EDITED :
I have no more code, this is the only one, I run the ffprobe command in a folder and I select the ones that have 48000Hz to copy to another folder, that's all !?!?

    


  • FFMPEG h264_videotoolbox change bit rate

    11 janvier 2019, par Chen Yang

    I want to use h264_videotoolbox encoder but i find that i couldn’t change bit rate dynamically.
    FFmpeg copies bit rate number and set that to toolbox session in init process, i think.

    bit_rate_num = CFNumberCreate(kCFAllocatorDefault,
    
                              kCFNumberSInt32Type,
    
                              &bit_rate);
    
if (!bit_rate_num) return AVERROR(ENOMEM);
    

    
status = VTSessionSetProperty(vtctx->session,
    
                              kVTCompressionPropertyKey_AverageBitRate,
    
                              bit_rate_num);
    
CFRelease(bit_rate_num);

    Do you guys know any way to do it ?

  • ffmpeg bit rate

    13 juillet 2012, par user1522872

    I am transcoding a video using FFMPEG API in c code.
    I am trying to set the video bit rate using the ffmpeg API as shown below :

    ovCodecCtx->bit_rate = 100 * 1000;

    The Encoder I am using is libx264.

    But this parameter is not taken into effect and the resulting video quality is very bad.
    I have even tried setting related parameters like rc_min_rate, rc_max_rate, etc.. but the video quality is still very low as these related parameters are not taken into effect.

    Could any expert tell how one can set the bit rate correctly using the FFMPEG API ?
    Thanks

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