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Autres articles (53)

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Sur d’autres sites (7831)

  • avformat/rtpdec_rfc4175 : add support for RANGE

    11 octobre 2021, par Limin Wang
    avformat/rtpdec_rfc4175 : add support for RANGE

    Signed-off-by : Limin Wang <lance.lmwang@gmail.com>
    • [DH] libavformat/rtpdec_rfc4175.c

  • vaapi_encode_h264 : Reduce SAR to valid range

    28 octobre 2018, par Mark Thompson
    vaapi_encode_h264 : Reduce SAR to valid range

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  • ffmpeg how to shorten volume range

    10 juillet 2021, par 敬錞 潘

    I use this command below to get volume information

    &#xA;

    ffmpeg -i {fileName} -af  "volumedetect" -f null -&#xA;

    &#xA;

    and get result below :

    &#xA;

    [Parsed_volumedetect_0 @ 000001b4f9675ec0] mean_volume: -25.1 dB&#xA;[Parsed_volumedetect_0 @ 000001b4f9675ec0] max_volume: -4.0 dB&#xA;[Parsed_volumedetect_0 @ 000001b4f9675ec0] histogram_4db: 12&#xA;[Parsed_volumedetect_0 @ 000001b4f9675ec0] histogram_5db: 72&#xA;[Parsed_volumedetect_0 @ 000001b4f9675ec0] histogram_6db: 293&#xA;[Parsed_volumedetect_0 @ 000001b4f9675ec0] histogram_7db: 808&#xA;[Parsed_volumedetect_0 @ 000001b4f9675ec0] histogram_8db: 2276&#xA;[Parsed_volumedetect_0 @ 000001b4f9675ec0] histogram_9db: 5885&#xA;[Parsed_volumedetect_0 @ 000001b4f9675ec0] histogram_10db: 13146&#xA;[Parsed_volumedetect_0 @ 000001b4f9675ec0] histogram_11db: 26627&#xA;

    &#xA;

    I want to shorten volume range to half range like this below

    &#xA;

    [Parsed_volumedetect_0 @ 000001b4f9675ec0] histogram_6db: ...&#xA;[Parsed_volumedetect_0 @ 000001b4f9675ec0] histogram_7db: ...&#xA;[Parsed_volumedetect_0 @ 000001b4f9675ec0] histogram_8db: ...&#xA;[Parsed_volumedetect_0 @ 000001b4f9675ec0] histogram_9db: ...&#xA;

    &#xA;

    How to do it by ffmpeg command ?

    &#xA;

    Update1 :

    &#xA;

    filename.mp3 volume detect is below :

    &#xA;

    [Parsed_volumedetect_0 @ 00000192cd9adcc0] max_volume: -0.3 dB&#xA;[Parsed_volumedetect_0 @ 00000192cd9adcc0] histogram_0db: 32&#xA;[Parsed_volumedetect_0 @ 00000192cd9adcc0] histogram_1db: 333&#xA;[Parsed_volumedetect_0 @ 00000192cd9adcc0] histogram_2db: 1216&#xA;[Parsed_volumedetect_0 @ 00000192cd9adcc0] histogram_3db: 3490&#xA;[Parsed_volumedetect_0 @ 00000192cd9adcc0] histogram_4db: 8829&#xA;[Parsed_volumedetect_0 @ 00000192cd9adcc0] histogram_5db: 19873&#xA;

    &#xA;

    after execute command

    &#xA;

    ffmpeg -i filename.mp3 -af filename_output.mp3&#xA;

    &#xA;

    filename_output.mp3 volume detect is below :

    &#xA;

    [Parsed_volumedetect_0 @ 0000017af506dd00] max_volume: -0.4 dB&#xA;[Parsed_volumedetect_0 @ 0000017af506dd00] histogram_0db: 13&#xA;[Parsed_volumedetect_0 @ 0000017af506dd00] histogram_1db: 226&#xA;[Parsed_volumedetect_0 @ 0000017af506dd00] histogram_2db: 906&#xA;[Parsed_volumedetect_0 @ 0000017af506dd00] histogram_3db: 2688&#xA;[Parsed_volumedetect_0 @ 0000017af506dd00] histogram_4db: 7202&#xA;[Parsed_volumedetect_0 @ 0000017af506dd00] histogram_5db: 16473&#xA;

    &#xA;

    There is no big changes, if I want to shorten more volume range , how to do ?

    &#xA;

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