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FFmpeg检查音频通道是否静音
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FFmpeg检查音频通道是否静音
作者:
满目山河
发布时间:
2024-03-07 04:08:50 (1月前)
转自：
<div class =“excerpt”> 我有两个.mp4文件，都有8（7.1）个音频通道。但事实上，我被告知有一个立体声音频通道+ 2 SAP（通道7-8上的辅助音频），另一个有6（5.1）...... </DIV>
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岁爵
|
2019-08-31 10-32
<div class =“post-text”itemprop =“text”> <P> 两个示例文件都有4个音频流或轨道。每个音轨有2个通道，立体声布局。 </p> <P> 显然，音频编码器是恒定的比特率，因此元数据不能用于区分无声轨道和带声音轨道。 </p> <P> 您需要解析每个可疑音频流。 </p> <pre> <code> ffmpeg -i file -map 0:a:1 -af astats -f null - </code> </pre> <P> 在控制台日志的末尾，将打印音频流的统计信息， </p> <P> 例如 </p> <pre> <code> [Parsed_astats_0 @ 0000000003c3aec0] Channel: 1 [Parsed_astats_0 @ 0000000003c3aec0] DC offset: 0.000000 [Parsed_astats_0 @ 0000000003c3aec0] Min level: 0.000000 [Parsed_astats_0 @ 0000000003c3aec0] Max level: 0.000000 [Parsed_astats_0 @ 0000000003c3aec0] Min difference: 0.000000 [Parsed_astats_0 @ 0000000003c3aec0] Max difference: 0.000000 [Parsed_astats_0 @ 0000000003c3aec0] Mean difference: 0.000000 [Parsed_astats_0 @ 0000000003c3aec0] RMS difference: 0.000000 [Parsed_astats_0 @ 0000000003c3aec0] Peak level dB: -6153.053111 [Parsed_astats_0 @ 0000000003c3aec0] RMS level dB: -inf [Parsed_astats_0 @ 0000000003c3aec0] RMS peak dB: -3076.526556 [Parsed_astats_0 @ 0000000003c3aec0] RMS trough dB: -inf [Parsed_astats_0 @ 0000000003c3aec0] Crest factor: 1.000000 [Parsed_astats_0 @ 0000000003c3aec0] Flat factor: -inf [Parsed_astats_0 @ 0000000003c3aec0] Peak count: 662528 [Parsed_astats_0 @ 0000000003c3aec0] Bit depth: 0/0 [Parsed_astats_0 @ 0000000003c3aec0] Dynamic range: -inf [Parsed_astats_0 @ 0000000003c3aec0] Zero crossings: 0 [Parsed_astats_0 @ 0000000003c3aec0] Zero crossings rate: 0.000000 [Parsed_astats_0 @ 0000000003c3aec0] Channel: 2 [Parsed_astats_0 @ 0000000003c3aec0] DC offset: 0.000000 [Parsed_astats_0 @ 0000000003c3aec0] Min level: 0.000000 [Parsed_astats_0 @ 0000000003c3aec0] Max level: 0.000000 [Parsed_astats_0 @ 0000000003c3aec0] Min difference: 0.000000 [Parsed_astats_0 @ 0000000003c3aec0] Max difference: 0.000000 [Parsed_astats_0 @ 0000000003c3aec0] Mean difference: 0.000000 [Parsed_astats_0 @ 0000000003c3aec0] RMS difference: 0.000000 [Parsed_astats_0 @ 0000000003c3aec0] Peak level dB: -6153.053111 [Parsed_astats_0 @ 0000000003c3aec0] RMS level dB: -inf [Parsed_astats_0 @ 0000000003c3aec0] RMS peak dB: -3076.526556 [Parsed_astats_0 @ 0000000003c3aec0] RMS trough dB: -inf [Parsed_astats_0 @ 0000000003c3aec0] Crest factor: 1.000000 [Parsed_astats_0 @ 0000000003c3aec0] Flat factor: -inf [Parsed_astats_0 @ 0000000003c3aec0] Peak count: 662528 [Parsed_astats_0 @ 0000000003c3aec0] Bit depth: 0/0 [Parsed_astats_0 @ 0000000003c3aec0] Dynamic range: -inf [Parsed_astats_0 @ 0000000003c3aec0] Zero crossings: 0 [Parsed_astats_0 @ 0000000003c3aec0] Zero crossings rate: 0.000000 [Parsed_astats_0 @ 0000000003c3aec0] Overall [Parsed_astats_0 @ 0000000003c3aec0] DC offset: 0.000000 [Parsed_astats_0 @ 0000000003c3aec0] Min level: 0.000000 [Parsed_astats_0 @ 0000000003c3aec0] Max level: 0.000000 [Parsed_astats_0 @ 0000000003c3aec0] Min difference: 0.000000 [Parsed_astats_0 @ 0000000003c3aec0] Max difference: 0.000000 [Parsed_astats_0 @ 0000000003c3aec0] Mean difference: 0.000000 [Parsed_astats_0 @ 0000000003c3aec0] RMS difference: 0.000000 [Parsed_astats_0 @ 0000000003c3aec0] Peak level dB: -6153.053111 [Parsed_astats_0 @ 0000000003c3aec0] RMS level dB: -inf [Parsed_astats_0 @ 0000000003c3aec0] RMS peak dB: -3076.526556 [Parsed_astats_0 @ 0000000003c3aec0] RMS trough dB: -inf [Parsed_astats_0 @ 0000000003c3aec0] Flat factor: -inf [Parsed_astats_0 @ 0000000003c3aec0] Peak count: 662528.000000 [Parsed_astats_0 @ 0000000003c3aec0] Bit depth: 0/0 [Parsed_astats_0 @ 0000000003c3aec0] Number of samples: 662528 </code> </pre> <P> 如果 <code> RMS level dB </code> 是 <code> -inf </code> 那个频道是沉默的。 </p> </DIV>
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