blocks|key|609182|text|ffmpeg+-i+sample.avi将为您的文件提供音频/视频格式信息。确保您配置了正确的库来解析输入流。此外，请确保文件未损坏。|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|609183|entityMap^0|0|K|0^^$0|@$1|2|3|4|5|6|7|H|8|@$9|I|A|J|B|C]]|D|@]|E|$]]|$1|F|3|-4|5|6|7|K|8|@]|D|@]|E|$]]]|G|$]]

<code>ffmpeg -i sample.avi</code> will give you the audio/video format info for your file. Make sure you have the proper libraries configured to parse the input streams. Also, make sure that the file isn't corrupt.

blocks|key|393148|text|命令行是正确的，并且可以在有效的视频文件上工作。我会确保你已经安装了正确的库来使用mp3，安装带有另一个音频编解码器的lame+o+probe。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|393149|通常|393150|ffmpeg+-formats|code-block|syntax|javascript|393151|或|393152|ffmpeg+-codecs|393153|会给你足够的信息，让你知道更多。|393154|entityMap^0|0|0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|Q|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|R|8|@]|9|@]|A|$]]|$1|D|3|E|5|F|7|S|8|@]|9|@]|A|$G|H]]|$1|I|3|J|5|6|7|T|8|@]|9|@]|A|$]]|$1|K|3|L|5|F|7|U|8|@]|9|@]|A|$G|H]]|$1|M|3|N|5|6|7|V|8|@]|9|@]|A|$]]|$1|O|3|-4|5|6|7|W|8|@]|9|@]|A|$]]]|P|$]]

The command line is correct and works on a valid video file. I would make sure that you have installed the correct library to work with mp3, install lame o probe with another audio codec.

Usually

<pre><code>ffmpeg -formats
</code></pre>

or

<pre><code>ffmpeg -codecs
</code></pre>

would give sufficient information so that you know more.

blocks|key|393190|text|如果包装到avi中的音频一开始就不是MP3格式，您可能需要指定-acodec+mp3作为附加参数。或者不管你的mp3编解码器是什么(在Linux系统上可能是-acodec+libmp3lame)。您还可以通过指定-f+mp3来“强制”将格式转换为mp3，从而获得与平台无关的相同效果，尽管并不是所有版本的ffmpeg都支持该开关。您的里程可能会有所不同。|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|393191|entityMap^0|V|B|26|I|2Y|6|0^^$0|@$1|2|3|4|5|6|7|H|8|@$9|I|A|J|B|C]|$9|K|A|L|B|C]|$9|M|A|N|B|C]]|D|@]|E|$]]|$1|F|3|-4|5|6|7|O|8|@]|D|@]|E|$]]]|G|$]]

If the audio wrapped into the avi is not mp3-format to start with, you may need to specify <code>-acodec mp3</code> as an additional parameter. Or whatever your mp3 codec is (on Linux systems its probably <code>-acodec libmp3lame</code>). You may also get the same effect, platform-agnostic, by instead specifying <code>-f mp3</code> to "force" the format to mp3, although not all versions of ffmpeg still support that switch. Your Mileage May Vary.

blocks|key|609362|text|要对mp3音频进行编码，ffmpeg.org将显示以下示例：|type|unstyled|depth|inlineStyleRanges|entityRanges|offset|length|data|609363|ffmpeg+-i+input.wav+-codec:a+libmp3lame+-qscale:a+2+output.mp3|code-block|syntax|javascript|609364|我只需将input.wav替换为视频文件名，即可从视频中提取音频。2表示190kb/秒。你可以在我上面的链接上看到其他的质量级别。|style|CODE|609365|entityMap|0|LINK|mutability|MUTABLE|url|https://trac.ffmpeg.org/wiki/Encode/MP3^0|C|A|0|0|0|4|9|X|1|0^^$0|@$1|2|3|4|5|6|7|U|8|@]|9|@$A|V|B|W|1|X]]|C|$]]|$1|D|3|E|5|F|7|Y|8|@]|9|@]|C|$G|H]]|$1|I|3|J|5|6|7|Z|8|@$A|10|B|11|K|L]|$A|12|B|13|K|L]]|9|@]|C|$]]|$1|M|3|-4|5|6|7|14|8|@]|9|@]|C|$]]]|N|$O|$5|P|Q|R|C|$S|T]]]]

To encode mp3 audio <a href="https://trac.ffmpeg.org/wiki/Encode/MP3" rel="noreferrer">ffmpeg.org</a> shows the following example:

<pre><code>ffmpeg -i input.wav -codec:a libmp3lame -qscale:a 2 output.mp3
</code></pre>

I extracted the audio from a video just by replacing <code>input.wav</code> with the video filename. The <code>2</code> means 190 kb/sec. You can see the other quality levels at my link above.

blocks|key|609428|text|对于寻找更简单的方法从视频文件中提取音频，同时保留原始视频文件的参数的人，您可以使用：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|609429|ffmpeg+-i+<video_file_name.extension>+<audio_file_name.extension>|code-block|syntax|javascript|609430|例如，运行：|609431|ffmpeg+-i+screencap.mov+screencap.mp3|609432|从mov视频文件中提取mp3音频文件。|offset|length|style|CODE|609433|entityMap^0|0|0|0|0|1|3|B|3|0^^$0|@$1|2|3|4|5|6|7|S|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|T|8|@]|9|@]|A|$E|F]]|$1|G|3|H|5|6|7|U|8|@]|9|@]|A|$]]|$1|I|3|J|5|D|7|V|8|@]|9|@]|A|$E|F]]|$1|K|3|L|5|6|7|W|8|@$M|X|N|Y|O|P]|$M|Z|N|10|O|P]]|9|@]|A|$]]|$1|Q|3|-4|5|6|7|11|8|@]|9|@]|A|$]]]|R|$]]

For people looking for the simpler way to extract audio from a video file while retaining the original video file's parameters, you can use:

<pre><code>ffmpeg -i &lt;video_file_name.extension&gt; &lt;audio_file_name.extension&gt;
</code></pre>

For example, running:

<pre><code>ffmpeg -i screencap.mov screencap.mp3
</code></pre>

extracts an <code>mp3</code> audio file from a <code>mov</code> video file.

blocks|key|609502|text|看起来你是在从视频文件中提取音频&缩混到立体声声道。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|609503|只提取音频(不重新编码)：|609504|ffmpeg.exe+-i+in.mp4+-vn+-c:a+copy+out.m4a|code-block|syntax|javascript|609505|提取音频和downmix+to+stereo+(不重新编码)：|offset|length|609506|ffmpeg.exe+-i+in.mp4+-vn+-c:a+copy+-ac+2+out.m4a|609507|要生成mp3文件，需要重新编码音频：|609508|ffmpeg.exe+-i+in.mp4+-vn+-ac+2+out.mp3|609509|entityMap|0|LINK|mutability|MUTABLE|url|https://trac.ffmpeg.org/wiki/AudioChannelManipulation#a5.1stereo^0|0|0|0|5|H|0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|10|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|11|8|@]|9|@]|A|$]]|$1|D|3|E|5|F|7|12|8|@]|9|@]|A|$G|H]]|$1|I|3|J|5|6|7|13|8|@]|9|@$K|14|L|15|1|16]]|A|$]]|$1|M|3|N|5|F|7|17|8|@]|9|@]|A|$G|H]]|$1|O|3|P|5|6|7|18|8|@]|9|@]|A|$]]|$1|Q|3|R|5|F|7|19|8|@]|9|@]|A|$G|H]]|$1|S|3|-4|5|6|7|1A|8|@]|9|@]|A|$]]]|T|$U|$5|V|W|X|A|$Y|Z]]]]

Seems like you're extracting audio from a video file &amp; downmixing to stereo channel. 
To just extract audio (without re-encoding):
<pre><code>ffmpeg.exe -i in.mp4 -vn -c:a copy out.m4a
</code></pre>
To extract audio &amp; <a href="https://trac.ffmpeg.org/wiki/AudioChannelManipulation#a5.1stereo" rel="noreferrer">downmix to stereo</a> (without re-encoding):
<pre><code>ffmpeg.exe -i in.mp4 -vn -c:a copy -ac 2 out.m4a
</code></pre>
To generate an mp3 file, you'd re-encode audio:
<pre><code>ffmpeg.exe -i in.mp4 -vn -ac 2 out.mp3
</code></pre>

I tried the following command to extract audio from video:

<pre><code>ffmpeg -i Sample.avi -vn -ar 44100 -ac 2 -ab 192k -f mp3 Sample.mp3
</code></pre>

but I get the following output

<pre><code>libavutil 50.15. 1 / 50.15. 1
libavcodec 52.72. 2 / 52.72. 2
libavformat 52.64. 2 / 52.64. 2
libavdevice 52. 2. 0 / 52. 2. 0
libavfilter 1.19. 0 / 1.19. 0
libswscale 0.11. 0 / 0.11. 0
libpostproc 51. 2. 0 / 51. 2. 0
SamplE.avi: Invalid data found when processing input
</code></pre>

Can anyone help, please?

How can I extract audio from video with ffmpeg?

我尝试了以下命令来从视频中提取音频：ffmpeg -i Sample.avi -vn -ar 44100 -ac 2 -ab 192k -f mp3 Sample.mp3但是我得到了以下输出libavutil     50.15. 1 / 50.15. 1libavcodec    52.72. 2 / 52.72. ...

问如何使用ffmpeg从视频中提取音频？
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问如何使用ffmpeg从视频中提取音频？
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