问题描述
这是我上一个问题的后续问题，，在这里我需要在特定音轨中寻找静音.这是ffmpeg救生解决方案，可帮助您获取一些元数据:
This is a follow-up question from my previous question asked here, where I needed to look for silence within a specific audio track. Here is the ffmpeg life-saver solution where helps to get some metadata:
ffmpeg -i file -map 0:a:1 -af astats -f null -
但是我还有其他类型的输入.mp4文件，其中它们具有一个单一轨道的8(即7.1)音频通道.显然，这些文件是从原始文件转码的(以某种方式将4个轨道立体声压缩为这些文件).现在类似于我以前的内容，我需要知道原始文件是2声道立体声还是5.1(6)声道.
But I have other type of input .mp4 files where they have one single track of 8 (i.e. 7.1) audio channels. Apparently these files are transcoded from an original file (somehow the 4 track stereos are squished into these files). Now similar to my previous, I need to know if the original file was 2-channel stereo or 5.1 (6) channel.
如何知道音频轨道的特定通道(例如Center通道)是否静音/静音(可能使用ffmpeg)? 此处是示例.mp4文件.
How to know if a specific channel of an audio track (say Center channel) is silent/mute, possibly using ffmpeg? Here is a sample .mp4 file.
推荐答案
您可以使用 channelsplit 过滤器以拆分音频通道，并在每个音频过滤器上运行 silencedetect .
You can use the channelsplit filter to split the audio channels and run silencedetect on each.
示例:
ffmpeg -i test2.mp4 -filter_complex "[0:a]channelsplit=channel_layout=7.1:channels=FC[fc];[fc]silencedetect" -f null /dev/null
您可以在此处找到有关音频通道操作的更多信息: https://trac.ffmpeg.org/wiki/AudioChannelManipulation
You can find more on audio channel manipulation here:https://trac.ffmpeg.org/wiki/AudioChannelManipulation
这篇关于FFmpeg检查7.1音频的通道是否静音的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持！